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MD phone number directory
Carriers, NPAs, prefixes and rate centers for MD.
Top carriers in MD
| Carrier | OCN | Blocks | Open |
|---|---|---|---|
| VERIZON MARYLAND, INC. | 9212 | 1085 | View |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 6395 | 305 | View |
| NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | 214 | View |
| SPRINT SPECTRUM L.P. | 6664 | 201 | View |
| XO MARYLAND, LLC | 4773 | 98 | View |
| CORE COMMUNICATIONS, INC. - MD | 2593 | 96 | View |
| MCI WORLDCOM COMMUNICATIONS, INC. - MD | 7228 | 86 | View |
| CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | 3910 | 82 | View |
| OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 6855 | 81 | View |
| GLOBAL CROSSING LOCAL SERVICES, INC.-MD | 6050 | 66 | View |
| LEVEL 3 COMMUNICATIONS, LLC - MD | 6119 | 62 | View |
| TELEPORT COMMUNICATIONS AMERICA, LLC - MD | 7325 | 59 | View |
| PEERLESS NETWORK OF MARYLAND, LLC | 568 | 48 | View |
| US LEC OF MARYLAND, INC. | 2589 | 46 | View |
| USA MOBILITY WIRELESS, INC. | 6630 | 40 | View |
| BROADWING COMMUNICATIONS. LLC - MD | 8864 | 36 | View |
| TELEPORT COMMUNICATIONS AMERICA, LLC - DC | 7529 | 35 | View |
| COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD | 107 | 33 | View |
| PAETEC COMMUNICATIONS, INC. - MD | 4716 | 32 | View |
| BANDWIDTH.COM CLEC, LLC - MD | 071 | 30 | View |
| CTC COMMUNICATIONS CORP. - MD | 2697 | 30 | View |
| ONVOY, LLC - MD | 876 | 29 | View |
| AT&T LOCAL | 7421 | 26 | View |
| LEVEL 3 TELECOM OF MARYLAND, LLC - MD | 7591 | 24 | View |
| CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD | 7944 | 23 | View |
| BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | 20 | View |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | 19 | View |
| CAVALIER EAST LLC - MD | 4820 | 17 | View |
| STARPOWER COMMUNICATIONS, LLC - MD | 8832 | 17 | View |
| BROADVOX-CLEC, LLC - MD | 912 | 13 | View |
| ALLEGIANCE TELECOM, INC. - MD | 8992 | 12 | View |
| SPRINT SPECTRUM L.P. - MD | 4098 | 12 | View |
| TELCOVE OPERATIONS, INC. - MD | 4749 | 8 | View |
| CENTURYLINK COMMUNICATIONS LLC | 7575 | 7 | View |
| METRO PCS, INC. | 5562 | 7 | View |
| NEW FRONTIERS TELECOMMUNICATIONS, INC. | 4606 | 7 | View |
| USCOC OF CUMBERLAND, INC. DBA UNITED STATES CEL MD | 4720 | 7 | View |
| LOCAL ACCESS LLC - MD | 082 | 6 | View |
| TELNYX LLC | 073 | 6 | View |
| VONAGE NETWORK INC. | 197 | 6 | View |
| BRIGHTLINK COMMUNICATIONS, LLC | 551 | 5 | View |
| YMAX COMMUNICATIONS CORP. - MD | 281 | 5 | View |
| ATLANTECH ONLINE, INC. - MD | 361 | 4 | View |
| BARR TELL USA, INC. | 964 | 4 | View |
| COMMIO, LLC | 939 | 4 | View |
| IDT AMERICA CORP - MD | 228 | 4 | View |
| LIGHTWAVE COMMUNICATIONS, LLC - MD | 5966 | 4 | View |
| ATX TELECOMMUNICATIONS SERVICES, LTD | 7061 | 3 | View |
| BROADVIEW NETWORKS, INC. - MD | 9170 | 3 | View |
| ONVOY SPECTRUM, LLC | 624 | 3 | View |
| REDI-CALL COMMUNICATIONS CO | 6810 | 3 | View |
| VOXBEAM TELECOMMUNICATIONS INC. - MD | 202 | 3 | View |
| ATX TELECOMMUNICATIONS SERVICES, LTD | 1958 | 2 | View |
| GLOBAL NAPS SOUTH, INC. - MD | 2554 | 2 | View |
| OMNIPOINT COMMUNICATIONS ENTERPRISES, L.P. | 6626 | 2 | View |
| QUANTUM TELECOMMUNICATIONS, INC. - MD | 2596 | 2 | View |
| SHENTEL COMMUNICATIONS, LLC - MD | 836 | 2 | View |
| VDL, INC. DBA GLOBAL TELECOM BROKERS - MD | 4492 | 2 | View |
| WIDE VOICE, LLC - MD | 530 | 2 | View |
| ADVANCED TELECOM SOLUTIONS, LLC | 181 | 1 | View |
| AIRESPRING, INC. | 996 | 1 | View |
| AIRUS, INC. - MD | 691 | 1 | View |
| AQUIS COMMUNICATIONS, INC. | 6919 | 1 | View |
| ARMSTRONG TELECOMMUNICATIONS, INC. - MD | 420 | 1 | View |
| ARMSTRONG TELEPHONE CO. OF MARYLAND | 0216 | 1 | View |
| CHARTER FIBERLINK - MARYLAND II, LLC - MD | 089 | 1 | View |
| DSLNET COMMUNICATIONS VA, INC. - MD | 5245 | 1 | View |
| EXIANT COMMUNICATIONS LLC | 114 | 1 | View |
| GETGO COMMUNICATIONS LLC - MD | 466 | 1 | View |
| LUMOS NETWORKS INC. - VA | 7849 | 1 | View |
| MCC TELEPHONY OF THE MID-ATLANTIC, LLC - MD | 861 | 1 | View |
| MOUNTAIN COMMUNICATIONS, LLC DBA PROCOM - MD | 676 | 1 | View |
| MTE, INC. DBA MTE PAGING NETWORK | 8605 | 1 | View |
| PAETEC COMMUNICATIONS, INC. - DC | 4989 | 1 | View |
| RCLEC, INC. - MD | 596 | 1 | View |
| TALKIE COMMUNICATIONS, INC. - MD | 327 | 1 | View |
| WEST TELECOM SERVICES, LLC - MD | 820 | 1 | View |
| WORLDCALL INTERCONNECT INC. | 139 | 1 | View |
Top 200 carriers (by blocks) in this state.
Ad Unit
Optional ad.Number blocks (sample)
| NPA | NXX | Rate center | Carrier | Open |
|---|---|---|---|---|
| 240 | 200 | WSHNGTNZN2 | BANDWIDTH.COM CLEC, LLC - MD | Prefix |
| 240 | 201 | RIDGE | PEERLESS NETWORK OF MARYLAND, LLC | Prefix |
| 240 | 203 | HAGERSTOWN | SPRINT SPECTRUM L.P. - MD | Prefix |
| 240 | 204 | WSHNGTNZN2 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 205 | WSNGTNZN10 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 206 | WSNG236Z14 | XO MARYLAND, LLC | Prefix |
| 240 | 207 | DAMASCS236 | CAVALIER EAST LLC - MD | Prefix |
| 240 | 208 | LA PLATA | PEERLESS NETWORK OF MARYLAND, LLC | Prefix |
| 240 | 209 | INDIANHEAD | PEERLESS NETWORK OF MARYLAND, LLC | Prefix |
| 240 | 210 | WALDORF | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 212 | OAKLAND | CORE COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 213 | WALDORF | PEERLESS NETWORK OF MARYLAND, LLC | Prefix |
| 240 | 214 | MECHANCSVL | PEERLESS NETWORK OF MARYLAND, LLC | Prefix |
| 240 | 215 | FREDERICK | TELCOVE OPERATIONS, INC. - MD | Prefix |
| 240 | 216 | WALDORF | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 217 | HAGERSTOWN | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | Prefix |
| 240 | 218 | NANJEMOY | PEERLESS NETWORK OF MARYLAND, LLC | Prefix |
| 240 | 219 | RIDGE | PEERLESS NETWORK OF MARYLAND, LLC | Prefix |
| 240 | 220 | POOLESVL | PEERLESS NETWORK OF MARYLAND, LLC | Prefix |
| 240 | 221 | WSNGTNZN11 | VERIZON MARYLAND, INC. | Prefix |
| 240 | 222 | WALDORF | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | Prefix |
| 240 | 223 | WSHNGTNZN2 | ALLEGIANCE TELECOM, INC. - MD | Prefix |
| 240 | 224 | GAITHERSBG | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 225 | FREDERICK | CORE COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 228 | WSNG236Z13 | VERIZON MARYLAND, INC. | Prefix |
| 240 | 229 | WALDORF | BROADWING COMMUNICATIONS. LLC - MD | Prefix |
| 240 | 230 | HUGHESVL | GLOBAL CROSSING LOCAL SERVICES, INC.-MD | Prefix |
| 240 | 231 | HAGERSTOWN | CORE COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 232 | WSNG236Z14 | BROADWING COMMUNICATIONS. LLC - MD | Prefix |
| 240 | 233 | TOMPKINSVL | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | Prefix |
| 240 | 234 | WSHNGTNZN2 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 235 | WSHNGTNZN2 | PAETEC COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 236 | FREDERICK | VERIZON MARYLAND, INC. | Prefix |
| 240 | 237 | LXTNPKGRML | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | Prefix |
| 240 | 238 | WSNGTNZN10 | PAETEC COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 239 | LEONARDTN | CORE COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 241 | WSNG236Z13 | STARPOWER COMMUNICATIONS, LLC - MD | Prefix |
| 240 | 242 | WSNGTNZN11 | STARPOWER COMMUNICATIONS, LLC - MD | Prefix |
| 240 | 243 | GAITHERSBG | ALLEGIANCE TELECOM, INC. - MD | Prefix |
| 240 | 244 | WSNGTNZN16 | STARPOWER COMMUNICATIONS, LLC - MD | Prefix |
| 240 | 245 | WSNG236Z14 | STARPOWER COMMUNICATIONS, LLC - MD | Prefix |
| 240 | 246 | GAITHERSBG | STARPOWER COMMUNICATIONS, LLC - MD | Prefix |
| 240 | 247 | WSHNGTNZN3 | ALLEGIANCE TELECOM, INC. - MD | Prefix |
| 240 | 248 | RIDGE | PEERLESS NETWORK OF MARYLAND, LLC | Prefix |
| 240 | 249 | MECHANCSVL | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | Prefix |
| 240 | 250 | BRANDYWINE | PEERLESS NETWORK OF MARYLAND, LLC | Prefix |
| 240 | 251 | HIGHFIELD | CORE COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 252 | GAITHERSBG | LEVEL 3 COMMUNICATIONS, LLC - MD | Prefix |
| 240 | 253 | WSHNGTNZN6 | GLOBAL CROSSING LOCAL SERVICES, INC.-MD | Prefix |
| 240 | 254 | HUGHESVL | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | Prefix |
| 240 | 255 | POOLESVL | PEERLESS NETWORK OF MARYLAND, LLC | Prefix |
| 240 | 256 | LEONARDTN | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | Prefix |
| 240 | 257 | NANJEMOY | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | Prefix |
| 240 | 258 | RIDGE | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | Prefix |
| 240 | 260 | WSNG236Z14 | ALLEGIANCE TELECOM, INC. - MD | Prefix |
| 240 | 261 | GAITHERSBG | ONVOY, LLC - MD | Prefix |
| 240 | 262 | LXTNPKGRML | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 263 | WSHNGTNZN2 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 264 | LAUREL236 | VERIZON MARYLAND, INC. | Prefix |
| 240 | 265 | WSHNGTNZN2 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 266 | WSNG236Z14 | PEERLESS NETWORK OF MARYLAND, LLC | Prefix |
| 240 | 267 | HAGERSTOWN | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 268 | WSNGTNZN10 | ALLEGIANCE TELECOM, INC. - MD | Prefix |
| 240 | 269 | WSNGTNZN16 | PEERLESS NETWORK OF MARYLAND, LLC | Prefix |
| 240 | 270 | WALDORF | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 271 | WSHNGTNZN2 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 272 | WSHNGTNZN2 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 273 | WSHNGTNZN6 | BROADWING COMMUNICATIONS. LLC - MD | Prefix |
| 240 | 274 | WSHNGTNZN2 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 275 | GRANTSVL | CORE COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 276 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 240 | 277 | WSHNGTNZN2 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 278 | LAUREL236 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 279 | WALDORF | CORE COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 280 | LAUREL236 | COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD | Prefix |
| 240 | 281 | WSHNGTNZN2 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 282 | MECHANCSVL | PEERLESS NETWORK OF MARYLAND, LLC | Prefix |
| 240 | 283 | WSNGTNZN11 | PAETEC COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 284 | FROSTBURG | LEVEL 3 COMMUNICATIONS, LLC - MD | Prefix |
| 240 | 285 | FREDERICK | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 286 | WSHNGTNZN2 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 287 | HANCOCK | CORE COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 288 | THURMONT | COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD | Prefix |
| 240 | 289 | WSHNGTNZN6 | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | Prefix |
| 240 | 290 | WSNGTNZN11 | ALLEGIANCE TELECOM, INC. - MD | Prefix |
| 240 | 291 | HAGERSTOWN | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 292 | WSNGTNZN11 | VERIZON MARYLAND, INC. | Prefix |
| 240 | 293 | WSNGTNZN12 | STARPOWER COMMUNICATIONS, LLC - MD | Prefix |
| 240 | 294 | LAUREL236 | XO MARYLAND, LLC | Prefix |
| 240 | 295 | LAUREL236 | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | Prefix |
| 240 | 296 | WSHNGTNZN4 | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | Prefix |
| 240 | 297 | WSNG236Z13 | LEVEL 3 COMMUNICATIONS, LLC - MD | Prefix |
| 240 | 298 | LEONARDTN | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 299 | WALDORF | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 300 | WALDORF | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 302 | LAUREL236 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 303 | WSNGTNZN16 | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | Prefix |
| 240 | 304 | WSHNGTNZN5 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 305 | WSHNGTNZN3 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 306 | GAITHERSBG | ALLEGIANCE TELECOM, INC. - MD | Prefix |
| 240 | 307 | EMMITSBURG | AT&T LOCAL | Prefix |
| 240 | 308 | DAMASCS236 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 309 | LEONARDTN | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 310 | HAGERSTOWN | USCOC OF CUMBERLAND, INC. DBA UNITED STATES CEL MD | Prefix |
| 240 | 312 | WSHNGTNZN5 | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | Prefix |
| 240 | 313 | HAGERSTOWN | VERIZON MARYLAND, INC. | Prefix |
| 240 | 314 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 240 | 315 | FREDERICK | VERIZON MARYLAND, INC. | Prefix |
| 240 | 316 | WSHNGTNZN2 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 317 | LXTNPKGRML | STARPOWER COMMUNICATIONS, LLC - MD | Prefix |
| 240 | 318 | WSNGTNZN16 | VERIZON MARYLAND, INC. | Prefix |
| 240 | 319 | LAUREL238 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 320 | WALDORF | CAVALIER EAST LLC - MD | Prefix |
| 240 | 321 | OAKLAND | USCOC OF CUMBERLAND, INC. DBA UNITED STATES CEL MD | Prefix |
| 240 | 322 | MCCOOLE | CORE COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 323 | EMMITSBURG | CORE COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 324 | ASHTON238 | YMAX COMMUNICATIONS CORP. - MD | Prefix |
| 240 | 325 | DAMASCS236 | CORE COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 326 | WSNG236Z15 | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | Prefix |
| 240 | 327 | GAITHERSBG | CORE COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 328 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 240 | 329 | HAGERSTOWN | LEVEL 3 COMMUNICATIONS, LLC - MD | Prefix |
| 240 | 330 | WSHNGTNZN2 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 331 | WSHNGTNZN3 | PEERLESS NETWORK OF MARYLAND, LLC | Prefix |
| 240 | 332 | TOMPKINSVL | PEERLESS NETWORK OF MARYLAND, LLC | Prefix |
| 240 | 333 | WSHNGTNZN2 | CAVALIER EAST LLC - MD | Prefix |
| 240 | 334 | WSNG236Z14 | GLOBAL CROSSING LOCAL SERVICES, INC.-MD | Prefix |
| 240 | 335 | WSNG236Z14 | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | Prefix |
| 240 | 336 | WSHNGTNZN2 | CORE COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 337 | WSHNGTNZN5 | ONVOY, LLC - MD | Prefix |
| 240 | 338 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 339 | WSNG236Z15 | CAVALIER EAST LLC - MD | Prefix |
| 240 | 340 | WSHNGTNZN2 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 341 | BUCKEYSTN | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 342 | ASHTON236 | STARPOWER COMMUNICATIONS, LLC - MD | Prefix |
| 240 | 343 | HANCOCK | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 344 | FREDERICK | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 345 | ASHTON238 | LEVEL 3 COMMUNICATIONS, LLC - MD | Prefix |
| 240 | 346 | WALDORF | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 347 | HAGERSTOWN | BANDWIDTH.COM CLEC, LLC - MD | Prefix |
| 240 | 348 | WSNGTNZN16 | LEVEL 3 COMMUNICATIONS, LLC - MD | Prefix |
| 240 | 349 | LA PLATA | GLOBAL CROSSING LOCAL SERVICES, INC.-MD | Prefix |
| 240 | 350 | WSHNGTNZN3 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 351 | WSHNGTNZN3 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 352 | LA PLATA | PEERLESS NETWORK OF MARYLAND, LLC | Prefix |
| 240 | 353 | WSHNGTNZN3 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 354 | WSHNGTNZN3 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 355 | WSHNGTNZN3 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 356 | MYERSVILLE | LEVEL 3 COMMUNICATIONS, LLC - MD | Prefix |
| 240 | 357 | FREDERICK | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 358 | DAMASCS236 | PEERLESS NETWORK OF MARYLAND, LLC | Prefix |
| 240 | 359 | INDIANHEAD | PEERLESS NETWORK OF MARYLAND, LLC | Prefix |
| 240 | 360 | LAUREL236 | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | Prefix |
| 240 | 361 | GAITHERSBG | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | Prefix |
| 240 | 362 | CUMBERLAND | VERIZON MARYLAND, INC. | Prefix |
| 240 | 363 | WSNGTNZN11 | ONVOY, LLC - MD | Prefix |
| 240 | 364 | GAITHERSBG | CAVALIER EAST LLC - MD | Prefix |
| 240 | 365 | DAMASCS236 | BALTIMORE-WASHINGTON TELEPHONE (BWT) | Prefix |
| 240 | 366 | WILLIAMSPT | AT&T LOCAL | Prefix |
| 240 | 367 | FREDERICK | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 368 | WALDORF | PEERLESS NETWORK OF MARYLAND, LLC | Prefix |
| 240 | 369 | MOUNT AIRY | CORE COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 370 | WSHNGTNZN2 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 371 | WSNGTNZN12 | PEERLESS NETWORK OF MARYLAND, LLC | Prefix |
| 240 | 372 | GAITHERSBG | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 373 | WSNG236Z13 | VERIZON MARYLAND, INC. | Prefix |
| 240 | 374 | LAUREL236 | GLOBAL CROSSING LOCAL SERVICES, INC.-MD | Prefix |
| 240 | 375 | WSHNGTNZN5 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 376 | HUGHESVL | PEERLESS NETWORK OF MARYLAND, LLC | Prefix |
| 240 | 377 | INDIANHEAD | GLOBAL CROSSING LOCAL SERVICES, INC.-MD | Prefix |
| 240 | 378 | CUMBERLAND | CORE COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 379 | FREDERICK | VERIZON MARYLAND, INC. | Prefix |
| 240 | 380 | WSHNGTNZN2 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 381 | WSHNGTNZN3 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 382 | HAGERSTOWN | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | Prefix |
| 240 | 383 | WSHNGTNZN2 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 384 | LXTNPKGRML | PEERLESS NETWORK OF MARYLAND, LLC | Prefix |
| 240 | 385 | MYERSVILLE | VERIZON MARYLAND, INC. | Prefix |
| 240 | 386 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 240 | 387 | WSNG236Z13 | CAVALIER EAST LLC - MD | Prefix |
| 240 | 388 | GAITHERSBG | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 389 | ASHTON236 | ATX TELECOMMUNICATIONS SERVICES, LTD | Prefix |
| 240 | 390 | ASHTON236 | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | Prefix |
| 240 | 391 | WSNG236Z13 | GLOBAL CROSSING LOCAL SERVICES, INC.-MD | Prefix |
| 240 | 392 | WSHNGTNZN5 | STARPOWER COMMUNICATIONS, LLC - MD | Prefix |
| 240 | 393 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 394 | MOUNT AIRY | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 395 | WSHNGTNZN2 | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | Prefix |
| 240 | 396 | WSHNGTNZN2 | GLOBAL CROSSING LOCAL SERVICES, INC.-MD | Prefix |
| 240 | 397 | FREDERICK | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 398 | WSHNGTNZN3 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 399 | WSNGTNZN10 | XO MARYLAND, LLC | Prefix |
| 240 | 400 | WSHNGTNZN2 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 401 | WSNGTNZN10 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 402 | WSNG236Z13 | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 403 | WSNGTNZN10 | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | Prefix |
| 240 | 404 | GAITHERSBG | XO MARYLAND, LLC | Prefix |
| 240 | 405 | FREDERICK | US LEC OF MARYLAND, INC. | Prefix |
| 240 | 406 | WSNGTNZN10 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 407 | WSNGTNZN16 | GLOBAL CROSSING LOCAL SERVICES, INC.-MD | Prefix |
| 240 | 408 | WSNGTNZN10 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 409 | FREDERICK | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 412 | WALDORF | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 413 | WSHNGTNZN4 | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | Prefix |
| 240 | 414 | WSHNGTNZN6 | PEERLESS NETWORK OF MARYLAND, LLC | Prefix |
| 240 | 415 | FREDERICK | YMAX COMMUNICATIONS CORP. - MD | Prefix |
| 240 | 416 | WALDORF | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 417 | WSHNGTNZN5 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 418 | WSHNGTNZN2 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 419 | WALDORF | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 420 | HAGERSTOWN | VERIZON MARYLAND, INC. | Prefix |
| 240 | 421 | WSNGTNZN10 | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | Prefix |
| 240 | 422 | FREDERICK | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | Prefix |
| 240 | 423 | WSHNGTNZN3 | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | Prefix |
| 240 | 424 | WSHNGTNZN3 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 425 | WSHNGTNZN2 | DSLNET COMMUNICATIONS VA, INC. - MD | Prefix |
| 240 | 426 | WSHNGTNZN2 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 427 | WALDORF | XO MARYLAND, LLC | Prefix |
| 240 | 428 | WSNGTNZN10 | BANDWIDTH.COM CLEC, LLC - MD | Prefix |
| 240 | 429 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 430 | WSNGTNZN11 | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | Prefix |
| 240 | 431 | LXTNPKGRML | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 432 | WSHNGTNZN3 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 433 | WSNGTNZN12 | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | Prefix |
| 240 | 434 | LEONARDTN | BROADWING COMMUNICATIONS. LLC - MD | Prefix |
| 240 | 435 | WALDORF | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 436 | BUCKEYSTN | TELCOVE OPERATIONS, INC. - MD | Prefix |
| 240 | 437 | ASHTON236 | XO MARYLAND, LLC | Prefix |
| 240 | 438 | WSHNGTNZN3 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 439 | FREDERICK | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 440 | FREDERICK | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 441 | WSHNGTNZN6 | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | Prefix |
| 240 | 442 | OAKLAND | VERIZON MARYLAND, INC. | Prefix |
| 240 | 444 | LAUREL236 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 445 | WSHNGTNZN2 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 446 | FREDERICK | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 447 | WSNGTNZN10 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 448 | WALDORF | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 449 | GAITHERSBG | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 450 | WSHNGTNZN3 | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | Prefix |
| 240 | 451 | THURMONT | BROADVOX-CLEC, LLC - MD | Prefix |
| 240 | 452 | HAGERSTOWN | LUMOS NETWORKS INC. - VA | Prefix |
| 240 | 453 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 240 | 454 | GAITHERSBG | PAETEC COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 455 | WSHNGTNZN5 | PAETEC COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 456 | LAUREL236 | VERIZON MARYLAND, INC. | Prefix |
| 240 | 457 | FREDERICK | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 458 | WALDORF | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 459 | LAUREL236 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 460 | WSHNGTNZN3 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 461 | WSHNGTNZN3 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 462 | WSHNGTNZN3 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 463 | WSHNGTNZN3 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 464 | WSHNGTNZN2 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 465 | WSHNGTNZN2 | PEERLESS NETWORK OF MARYLAND, LLC | Prefix |
| 240 | 466 | MECHANCSVL | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 467 | WSHNGTNZN4 | COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD | Prefix |
| 240 | 468 | WSHNGTNZN3 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 469 | HAGERSTOWN | SPRINT SPECTRUM L.P. - MD | Prefix |
| 240 | 470 | LAUREL236 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 471 | WSNGTNZN12 | GLOBAL CROSSING LOCAL SERVICES, INC.-MD | Prefix |
| 240 | 472 | WSHNGTNZN3 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 473 | WSNG236Z13 | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | Prefix |
| 240 | 474 | GAITHERSBG | BALTIMORE-WASHINGTON TELEPHONE (BWT) | Prefix |
| 240 | 475 | WSHNGTNZN3 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 476 | WSHNGTNZN3 | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | Prefix |
| 240 | 477 | GAITHERSBG | LIGHTWAVE COMMUNICATIONS, LLC - MD | Prefix |
| 240 | 478 | WSHNGTNZN3 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 479 | WSHNGTNZN2 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 480 | WSHNGTNZN2 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 481 | WSHNGTNZN3 | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | Prefix |
| 240 | 482 | WSHNGTNZN2 | US LEC OF MARYLAND, INC. | Prefix |
| 240 | 483 | WSHNGTNZN2 | COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD | Prefix |
| 240 | 484 | LAUREL236 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 485 | WSHNGTNZN3 | US LEC OF MARYLAND, INC. | Prefix |
| 240 | 486 | WSNG236Z14 | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | Prefix |
| 240 | 487 | WSHNGTNZN4 | US LEC OF MARYLAND, INC. | Prefix |
| 240 | 488 | OAKLAND | SHENTEL COMMUNICATIONS, LLC - MD | Prefix |
| 240 | 489 | POOLESVL | XO MARYLAND, LLC | Prefix |
| 240 | 490 | MIDDLETOWN | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | Prefix |
| 240 | 491 | WSHNGTNZN3 | GLOBAL CROSSING LOCAL SERVICES, INC.-MD | Prefix |
| 240 | 492 | WSHNGTNZN5 | US LEC OF MARYLAND, INC. | Prefix |
| 240 | 493 | WSHNGTNZN6 | US LEC OF MARYLAND, INC. | Prefix |
| 240 | 494 | WSHNGTNZN3 | CAVALIER EAST LLC - MD | Prefix |
| 240 | 495 | WSHNGTNZN4 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 496 | LEONARDTN | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 497 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 240 | 498 | WSHNGTNZN2 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 499 | WSNGTNZN10 | US LEC OF MARYLAND, INC. | Prefix |
| 240 | 500 | HAGERSTOWN | US LEC OF MARYLAND, INC. | Prefix |
| 240 | 501 | WSHNGTNZN3 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 502 | WSHNGTNZN3 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 503 | TOMPKINSVL | PEERLESS NETWORK OF MARYLAND, LLC | Prefix |
| 240 | 504 | WSHNGTNZN3 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 505 | WSHNGTNZN3 | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | Prefix |
| 240 | 506 | WSNGTNZN10 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 507 | WSHNGTNZN2 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 508 | WSHNGTNZN5 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 509 | WSNG238Z14 | BANDWIDTH.COM CLEC, LLC - MD | Prefix |
| 240 | 510 | WSNG236Z15 | XO MARYLAND, LLC | Prefix |
| 240 | 512 | WSNG238Z13 | CORE COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 513 | HAGERSTOWN | SPRINT SPECTRUM L.P. - MD | Prefix |
| 240 | 514 | WSNGTNZN11 | US LEC OF MARYLAND, INC. | Prefix |
| 240 | 515 | WSHNGTNZN2 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 516 | WSNGTNZN12 | US LEC OF MARYLAND, INC. | Prefix |
| 240 | 517 | LAUREL238 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 518 | WALDORF | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 519 | WSHNGTNZN2 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 520 | HAGERSTOWN | SPRINT SPECTRUM L.P. - MD | Prefix |
| 240 | 521 | LAUREL236 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 522 | CUMBERLAND | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 523 | LA PLATA | XO MARYLAND, LLC | Prefix |
| 240 | 524 | LAUREL236 | PEERLESS NETWORK OF MARYLAND, LLC | Prefix |
| 240 | 525 | WSNG236Z15 | PEERLESS NETWORK OF MARYLAND, LLC | Prefix |
| 240 | 526 | LEONARDTN | PEERLESS NETWORK OF MARYLAND, LLC | Prefix |
| 240 | 527 | HAGERSTOWN | VERIZON MARYLAND, INC. | Prefix |
| 240 | 528 | HUGHESVL | BROADWING COMMUNICATIONS. LLC - MD | Prefix |
| 240 | 529 | FREDERICK | VERIZON MARYLAND, INC. | Prefix |
| 240 | 530 | WALDORF | LOCAL ACCESS LLC - MD | Prefix |
| 240 | 531 | WSHNGTNZN3 | TELNYX LLC | Prefix |
| 240 | 532 | WSHNGTNZN5 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 533 | WSHNGTNZN3 | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | Prefix |
| 240 | 534 | WSHNGTNZN2 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 535 | WSHNGTNZN3 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 536 | ASHTON236 | PEERLESS NETWORK OF MARYLAND, LLC | Prefix |
| 240 | 537 | HAGERSTOWN | ATLANTECH ONLINE, INC. - MD | Prefix |
| 240 | 538 | LEONARDTN | XO MARYLAND, LLC | Prefix |
| 240 | 539 | WSHNGTNZN4 | PEERLESS NETWORK OF MARYLAND, LLC | Prefix |
| 240 | 540 | WSNG238Z13 | WIDE VOICE, LLC - MD | Prefix |
| 240 | 541 | WSHNGTNZN2 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 542 | WSNG236Z13 | US LEC OF MARYLAND, INC. | Prefix |
| 240 | 543 | WSHNGTNZN2 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 544 | WSNG236Z14 | US LEC OF MARYLAND, INC. | Prefix |
| 240 | 545 | WSNG236Z15 | US LEC OF MARYLAND, INC. | Prefix |
| 240 | 546 | WSNGTNZN16 | US LEC OF MARYLAND, INC. | Prefix |
| 240 | 547 | LAUREL236 | LEVEL 3 COMMUNICATIONS, LLC - MD | Prefix |
| 240 | 548 | WSNG236Z14 | ALLEGIANCE TELECOM, INC. - MD | Prefix |
| 240 | 549 | FREDERICK | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 550 | WSNGTNZN10 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 551 | WSNGTNZN10 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 552 | WSNGTNZN10 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 553 | WSNG236Z13 | ALLEGIANCE TELECOM, INC. - MD | Prefix |
| 240 | 554 | LAUREL236 | ALLEGIANCE TELECOM, INC. - MD | Prefix |
| 240 | 556 | WSNG236Z14 | PAETEC COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 557 | WSHNGTNZN6 | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | Prefix |
| 240 | 558 | WSNGTNZN11 | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | Prefix |
| 240 | 559 | ASHTON236 | ALLEGIANCE TELECOM, INC. - MD | Prefix |
| 240 | 560 | WSNGTNZN12 | XO MARYLAND, LLC | Prefix |
| 240 | 561 | LEONARDTN | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 562 | GAITHERSBG | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Prefix |
| 240 | 563 | WSHNGTNZN5 | ONVOY, LLC - MD | Prefix |
| 240 | 564 | LAUREL236 | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | Prefix |
| 240 | 565 | LAUREL238 | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | Prefix |
| 240 | 566 | FREDERICK | VERIZON MARYLAND, INC. | Prefix |
| 240 | 567 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 240 | 568 | LAUREL236 | VERIZON MARYLAND, INC. | Prefix |
| 240 | 569 | FLINTSTONE | BANDWIDTH.COM CLEC, LLC - MD | Prefix |
| 240 | 570 | ASHTON238 | ONVOY, LLC - MD | Prefix |
| 240 | 572 | LEONARDTN | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 573 | WSNG236Z15 | GLOBAL CROSSING LOCAL SERVICES, INC.-MD | Prefix |
| 240 | 575 | FREDERICK | LEVEL 3 COMMUNICATIONS, LLC - MD | Prefix |
| 240 | 576 | HAGERSTOWN | VONAGE NETWORK INC. | Prefix |
| 240 | 577 | LEONARDTN | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 578 | FREDERICK | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 579 | ASHTON236 | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | Prefix |
| 240 | 580 | CUMBERLAND | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 581 | LAUREL236 | PAETEC COMMUNICATIONS, INC. - DC | Prefix |
| 240 | 582 | WSHNGTNZN4 | VERIZON MARYLAND, INC. | Prefix |
| 240 | 583 | LAUREL236 | VERIZON MARYLAND, INC. | Prefix |
| 240 | 584 | LAUREL236 | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | Prefix |
| 240 | 585 | WALDORF | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 586 | FREDERICK | VERIZON MARYLAND, INC. | Prefix |
| 240 | 587 | LEONARDTN | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 588 | GRANTSVL | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 589 | MCCOOLE | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 590 | WSNGTNZN12 | METRO PCS, INC. | Prefix |
| 240 | 591 | HAGERSTOWN | SHENTEL COMMUNICATIONS, LLC - MD | Prefix |
| 240 | 592 | WSNG236Z13 | VERIZON MARYLAND, INC. | Prefix |
| 240 | 593 | LAUREL238 | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | Prefix |
| 240 | 594 | BITTINGER | BANDWIDTH.COM CLEC, LLC - MD | Prefix |
| 240 | 595 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 596 | ASHTON236 | CORE COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 597 | GAITHERSBG | PEERLESS NETWORK OF MARYLAND, LLC | Prefix |
| 240 | 598 | HUGHESVL | CORE COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 599 | WSNGTNZN10 | BROADWING COMMUNICATIONS. LLC - MD | Prefix |
| 240 | 600 | WSHNGTNZN2 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 601 | WSHNGTNZN3 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 602 | WSHNGTNZN3 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 603 | WSHNGTNZN3 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 604 | WSHNGTNZN3 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 605 | WSHNGTNZN3 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 606 | WSHNGTNZN3 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 607 | WALDORF | GLOBAL CROSSING LOCAL SERVICES, INC.-MD | Prefix |
| 240 | 608 | FREDERICK | BRIGHTLINK COMMUNICATIONS, LLC | Prefix |
| 240 | 609 | CUMBERLAND | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 610 | WSHNGTNZN4 | CORE COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 612 | WSHNGTNZN5 | LEVEL 3 TELECOM OF MARYLAND, LLC - MD | Prefix |
| 240 | 613 | WSHNGTNZN4 | US LEC OF MARYLAND, INC. | Prefix |
| 240 | 614 | WSNGTNZN10 | METRO PCS, INC. | Prefix |
| 240 | 615 | WSHNGTNZN4 | METRO PCS, INC. | Prefix |
| 240 | 616 | WSNG236Z13 | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 617 | HIGHFIELD | BANDWIDTH.COM CLEC, LLC - MD | Prefix |
| 240 | 618 | WSNGTNZN10 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 619 | WSHNGTNZN5 | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 620 | WSNGTNZN10 | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 621 | WSNGTNZN11 | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 622 | LA PLATA | CORE COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 623 | WSHNGTNZN4 | BANDWIDTH.COM CLEC, LLC - MD | Prefix |
| 240 | 624 | WSNG236Z13 | VERIZON MARYLAND, INC. | Prefix |
| 240 | 625 | HAGERSTOWN | SPRINT SPECTRUM L.P. - MD | Prefix |
| 240 | 626 | FREDERICK | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 627 | WSNGTNZN11 | GLOBAL CROSSING LOCAL SERVICES, INC.-MD | Prefix |
| 240 | 628 | MECHANCSVL | CORE COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 629 | FREDERICK | VERIZON MARYLAND, INC. | Prefix |
| 240 | 630 | WSHNGTNZN2 | BANDWIDTH.COM CLEC, LLC - MD | Prefix |
| 240 | 631 | GAITHERSBG | VERIZON MARYLAND, INC. | Prefix |
| 240 | 632 | GAITHERSBG | VERIZON MARYLAND, INC. | Prefix |
| 240 | 633 | HUGHESVL | BALTIMORE-WASHINGTON TELEPHONE (BWT) | Prefix |
| 240 | 634 | RIDGE | CORE COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 635 | TOMPKINSVL | CORE COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 636 | LAUREL236 | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | Prefix |
| 240 | 637 | WSHNGTNZN3 | CORE COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 638 | WSHNGTNZN3 | BROADWING COMMUNICATIONS. LLC - MD | Prefix |
| 240 | 639 | LAUREL236 | CORE COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 640 | WALDORF | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 641 | WSHNGTNZN3 | PEERLESS NETWORK OF MARYLAND, LLC | Prefix |
| 240 | 642 | WSNGTNZN10 | ADVANCED TELECOM SOLUTIONS, LLC | Prefix |
| 240 | 643 | WSHNGTNZN3 | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | Prefix |
| 240 | 644 | WSHNGTNZN2 | XO MARYLAND, LLC | Prefix |
| 240 | 645 | WSHNGTNZN3 | XO MARYLAND, LLC | Prefix |
| 240 | 646 | LAUREL236 | CAVALIER EAST LLC - MD | Prefix |
| 240 | 647 | CLEAR SPG | CORE COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 648 | KEEDYSVL | CORE COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 649 | SMITHSBURG | CORE COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 650 | WSHNGTNZN3 | BROADVOX-CLEC, LLC - MD | Prefix |
| 240 | 651 | FREDERICK | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 652 | MECHANCSVL | XO MARYLAND, LLC | Prefix |
| 240 | 653 | LAUREL238 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 654 | GAITHERSBG | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 655 | KITZMILLER | ONVOY, LLC - MD | Prefix |
| 240 | 656 | POOLESVL | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 657 | FROSTBURG | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 658 | GAITHERSBG | VONAGE NETWORK INC. | Prefix |
| 240 | 660 | WSNGTNZN10 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 661 | LXTNPKGRML | BALTIMORE-WASHINGTON TELEPHONE (BWT) | Prefix |
| 240 | 662 | WSHNGTNZN3 | VERIZON MARYLAND, INC. | Prefix |
| 240 | 665 | WSNGTNZN10 | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | Prefix |
| 240 | 666 | NANJEMOY | VOXBEAM TELECOMMUNICATIONS INC. - MD | Prefix |
| 240 | 667 | WSHNGTNZN4 | GLOBAL CROSSING LOCAL SERVICES, INC.-MD | Prefix |
| 240 | 668 | DAMASCS236 | STARPOWER COMMUNICATIONS, LLC - MD | Prefix |
| 240 | 669 | WSNGTNZN11 | COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD | Prefix |
| 240 | 670 | WSHNGTNZN3 | LOCAL ACCESS LLC - MD | Prefix |
| 240 | 671 | WSHNGTNZN2 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 672 | WSNGTNZN10 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 674 | FREDERICK | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 675 | MYERSVILLE | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 676 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 678 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 679 | FRIENDSVL | CORE COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 680 | FREDERICK | PEERLESS NETWORK OF MARYLAND, LLC | Prefix |
| 240 | 681 | BRANDYWINE | ATX TELECOMMUNICATIONS SERVICES, LTD | Prefix |
| 240 | 682 | WALDORF | STARPOWER COMMUNICATIONS, LLC - MD | Prefix |
| 240 | 683 | GAITHERSBG | VERIZON MARYLAND, INC. | Prefix |
| 240 | 684 | WSNG236Z13 | VERIZON MARYLAND, INC. | Prefix |
| 240 | 685 | BRANDYWINE | GLOBAL CROSSING LOCAL SERVICES, INC.-MD | Prefix |
| 240 | 686 | GAITHERSBG | VERIZON MARYLAND, INC. | Prefix |
| 240 | 687 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 688 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 690 | GAITHERSBG | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | Prefix |
| 240 | 691 | WSHNGTNZN5 | GLOBAL CROSSING LOCAL SERVICES, INC.-MD | Prefix |
| 240 | 694 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 240 | 695 | WSHNGTNZN5 | VERIZON MARYLAND, INC. | Prefix |
| 240 | 696 | WSHNGTNZN4 | LEVEL 3 COMMUNICATIONS, LLC - MD | Prefix |
| 240 | 699 | BUCKEYSTN | VERIZON MARYLAND, INC. | Prefix |
| 240 | 701 | WSHNGTNZN3 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 702 | GAITHERSBG | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 704 | WSHNGTNZN3 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 705 | WSHNGTNZN3 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 706 | WSHNGTNZN3 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 707 | HAGERSTOWN | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 708 | LAUREL238 | LEVEL 3 COMMUNICATIONS, LLC - MD | Prefix |
| 240 | 712 | LAUREL238 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 713 | LAUREL236 | PEERLESS NETWORK OF MARYLAND, LLC | Prefix |
| 240 | 714 | WSHNGTNZN4 | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | Prefix |
| 240 | 715 | WSNGTNZN10 | GLOBAL CROSSING LOCAL SERVICES, INC.-MD | Prefix |
| 240 | 716 | WSHNGTNZN5 | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | Prefix |
| 240 | 718 | LXTNPKGRML | XO MARYLAND, LLC | Prefix |
| 240 | 719 | WSHNGTNZN5 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 720 | GAITHERSBG | GLOBAL CROSSING LOCAL SERVICES, INC.-MD | Prefix |
| 240 | 722 | ASHTON236 | GLOBAL CROSSING LOCAL SERVICES, INC.-MD | Prefix |
| 240 | 723 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 724 | WSHNGTNZN6 | CAVALIER EAST LLC - MD | Prefix |
| 240 | 725 | LXTNPKGRML | VERIZON MARYLAND, INC. | Prefix |
| 240 | 727 | CUMBERLAND | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 731 | WSNGTNZN10 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 732 | MOUNT AIRY | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 734 | SMITHSBURG | BANDWIDTH.COM CLEC, LLC - MD | Prefix |
| 240 | 737 | WSHNGTNZN4 | CAVALIER EAST LLC - MD | Prefix |
| 240 | 740 | WSNGTNZN10 | ATLANTECH ONLINE, INC. - MD | Prefix |
| 240 | 743 | WSHNGTNZN2 | LOCAL ACCESS LLC - MD | Prefix |
| 240 | 744 | WSHNGTNZN2 | BROADWING COMMUNICATIONS. LLC - MD | Prefix |
| 240 | 745 | DAMASCS236 | XO MARYLAND, LLC | Prefix |
| 240 | 747 | WSNGTNZN11 | CAVALIER EAST LLC - MD | Prefix |
| 240 | 750 | GAITHERSBG | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 751 | GAITHERSBG | TELCOVE OPERATIONS, INC. - MD | Prefix |
| 240 | 752 | WSHNGTNZN2 | TELCOVE OPERATIONS, INC. - MD | Prefix |
| 240 | 753 | WSNGTNZN10 | TELCOVE OPERATIONS, INC. - MD | Prefix |
| 240 | 754 | WALDORF | LEVEL 3 COMMUNICATIONS, LLC - MD | Prefix |
| 240 | 755 | LAUREL238 | COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD | Prefix |
| 240 | 757 | WSNG236Z13 | PEERLESS NETWORK OF MARYLAND, LLC | Prefix |
| 240 | 758 | LAUREL236 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 760 | WSHNGTNZN2 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 762 | WSHNGTNZN2 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 763 | WSNG238Z15 | BANDWIDTH.COM CLEC, LLC - MD | Prefix |
| 240 | 764 | WSHNGTNZN4 | XO MARYLAND, LLC | Prefix |
| 240 | 765 | WSHNGTNZN5 | XO MARYLAND, LLC | Prefix |
| 240 | 766 | WSHNGTNZN6 | XO MARYLAND, LLC | Prefix |
| 240 | 767 | WSHNGTNZN5 | CAVALIER EAST LLC - MD | Prefix |
| 240 | 770 | WSHNGTNZN4 | COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD | Prefix |
| 240 | 771 | POOLESVL | ONVOY, LLC - MD | Prefix |
| 240 | 772 | FREDERICK | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 773 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 240 | 774 | LONACONING | BANDWIDTH.COM CLEC, LLC - MD | Prefix |
| 240 | 775 | WESTERNPT | BANDWIDTH.COM CLEC, LLC - MD | Prefix |
| 240 | 776 | LA PLATA | BROADWING COMMUNICATIONS. LLC - MD | Prefix |
| 240 | 777 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 240 | 778 | WSNGTNZN10 | XO MARYLAND, LLC | Prefix |
| 240 | 779 | ASHTON236 | CAVALIER EAST LLC - MD | Prefix |
| 240 | 780 | GAITHERSBG | BROADWING COMMUNICATIONS. LLC - MD | Prefix |
| 240 | 781 | WSHNGTNZN2 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Prefix |
| 240 | 782 | DAMASCS236 | GLOBAL CROSSING LOCAL SERVICES, INC.-MD | Prefix |
| 240 | 783 | WSHNGTNZN2 | MTE, INC. DBA MTE PAGING NETWORK | Prefix |
| 240 | 784 | MYERSVILLE | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | Prefix |
| 240 | 786 | LAUREL236 | BROADWING COMMUNICATIONS. LLC - MD | Prefix |
| 240 | 787 | BRANDYWINE | BROADWING COMMUNICATIONS. LLC - MD | Prefix |
| 240 | 788 | WSHNGTNZN5 | BROADWING COMMUNICATIONS. LLC - MD | Prefix |
| 240 | 790 | WSNG236Z13 | BROADWING COMMUNICATIONS. LLC - MD | Prefix |
| 240 | 793 | GAITHERSBG | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 794 | LXTNPKGRML | BROADWING COMMUNICATIONS. LLC - MD | Prefix |
| 240 | 800 | WSHNGTNZN2 | CORE COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 801 | GAITHERSBG | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 802 | WSHNGTNZN2 | BRIGHTLINK COMMUNICATIONS, LLC | Prefix |
| 240 | 803 | CUMBERLAND | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 804 | TOMPKINSVL | XO MARYLAND, LLC | Prefix |
| 240 | 805 | GAITHERSBG | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 806 | INDIANHEAD | PEERLESS NETWORK OF MARYLAND, LLC | Prefix |
| 240 | 808 | LEONARDTN | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 810 | WSNGTNZN10 | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | Prefix |
| 240 | 812 | POOLESVL | GLOBAL CROSSING LOCAL SERVICES, INC.-MD | Prefix |
| 240 | 813 | GAITHERSBG | ATX TELECOMMUNICATIONS SERVICES, LTD | Prefix |
| 240 | 815 | FREDERICK | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 816 | KEEDYSVL | BANDWIDTH.COM CLEC, LLC - MD | Prefix |
| 240 | 817 | ASHTON236 | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | Prefix |
| 240 | 818 | MYERSVILLE | VERIZON MARYLAND, INC. | Prefix |
| 240 | 821 | WSHNGTNZN3 | LIGHTWAVE COMMUNICATIONS, LLC - MD | Prefix |
| 240 | 823 | BRANDYWINE | XO MARYLAND, LLC | Prefix |
| 240 | 825 | WSHNGTNZN4 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 826 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 240 | 828 | WSHNGTNZN4 | TELNYX LLC | Prefix |
| 240 | 830 | WSHNGTNZN5 | COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD | Prefix |
| 240 | 831 | FREDERICK | BROADVOX-CLEC, LLC - MD | Prefix |
| 240 | 832 | WSHNGTNZN2 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 833 | WSNGTNZN11 | XO MARYLAND, LLC | Prefix |
| 240 | 837 | HUGHESVL | XO MARYLAND, LLC | Prefix |
| 240 | 838 | WSHNGTNZN5 | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | Prefix |
| 240 | 839 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 840 | FREDERICK | ONVOY SPECTRUM, LLC | Prefix |
| 240 | 841 | LAUREL238 | XO MARYLAND, LLC | Prefix |
| 240 | 842 | WSNG238Z14 | XO MARYLAND, LLC | Prefix |
| 240 | 843 | WSNG238Z13 | XO MARYLAND, LLC | Prefix |
| 240 | 844 | RIDGE | XO MARYLAND, LLC | Prefix |
| 240 | 845 | WSNG236Z13 | XO MARYLAND, LLC | Prefix |
| 240 | 846 | WSNGTNZN16 | XO MARYLAND, LLC | Prefix |
| 240 | 847 | WSHNGTNZN3 | ONVOY, LLC - MD | Prefix |
| 240 | 848 | GAITHERSBG | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 850 | HAGERSTOWN | PEERLESS NETWORK OF MARYLAND, LLC | Prefix |
| 240 | 855 | WSHNGTNZN2 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 856 | LAUREL238 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 857 | WSHNGTNZN5 | LEVEL 3 TELECOM OF MARYLAND, LLC - MD | Prefix |
| 240 | 858 | WSHNGTNZN2 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 859 | ASHTON238 | BROADVOX-CLEC, LLC - MD | Prefix |
| 240 | 860 | CUMBERLAND | PEERLESS NETWORK OF MARYLAND, LLC | Prefix |
| 240 | 862 | MT SAVAGE | BROADVOX-CLEC, LLC - MD | Prefix |
| 240 | 863 | WSHNGTNZN3 | LEVEL 3 TELECOM OF MARYLAND, LLC - MD | Prefix |
| 240 | 864 | WSNGTNZN10 | CAVALIER EAST LLC - MD | Prefix |
| 240 | 865 | WSNG238Z14 | LEVEL 3 COMMUNICATIONS, LLC - MD | Prefix |
| 240 | 867 | WSHNGTNZN3 | COMMIO, LLC | Prefix |
| 240 | 868 | WSNGTNZN12 | CAVALIER EAST LLC - MD | Prefix |
| 240 | 870 | MIDDLETOWN | BROADVOX-CLEC, LLC - MD | Prefix |
| 240 | 876 | WSHNGTNZN2 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 877 | FREDERICK | ONVOY, LLC - MD | Prefix |
| 240 | 878 | HAGERSTOWN | COMMIO, LLC | Prefix |
| 240 | 880 | WSNGTNZN11 | BROADWING COMMUNICATIONS. LLC - MD | Prefix |
| 240 | 882 | WSHNGTNZN5 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 883 | ASHTON236 | BROADWING COMMUNICATIONS. LLC - MD | Prefix |
| 240 | 888 | WSNGTNZN10 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 892 | WSNG236Z15 | BROADWING COMMUNICATIONS. LLC - MD | Prefix |
| 240 | 893 | WSHNGTNZN3 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 895 | LXTNPKGRML | VERIZON MARYLAND, INC. | Prefix |
| 240 | 897 | WSNGTNZN16 | BROADWING COMMUNICATIONS. LLC - MD | Prefix |
| 240 | 898 | WSHNGTNZN4 | BROADWING COMMUNICATIONS. LLC - MD | Prefix |
| 240 | 899 | WSHNGTNZN2 | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | Prefix |
| 240 | 900 | WSHNGTNZN4 | ONVOY, LLC - MD | Prefix |
| 240 | 901 | LA PLATA | CENTURYLINK COMMUNICATIONS LLC | Prefix |
| 240 | 903 | INDIANHEAD | COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD | Prefix |
| 240 | 904 | LAUREL238 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 906 | WSHNGTNZN4 | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | Prefix |
| 240 | 907 | WSNGTNZN10 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 908 | WALKERSVL | BROADVOX-CLEC, LLC - MD | Prefix |
| 240 | 912 | GAITHERSBG | US LEC OF MARYLAND, INC. | Prefix |
| 240 | 913 | DAMASCS240 | BROADVOX-CLEC, LLC - MD | Prefix |
| 240 | 915 | NEW MARKET | BROADVOX-CLEC, LLC - MD | Prefix |
| 240 | 917 | LAUREL236 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 240 | 918 | ASHTON236 | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | Prefix |
| 240 | 920 | CUMBERLAND | LEVEL 3 COMMUNICATIONS, LLC - MD | Prefix |
| 240 | 925 | LEONARDTN | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 929 | WSNG236Z14 | CAVALIER EAST LLC - MD | Prefix |
| 240 | 938 | ASHTON236 | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | Prefix |
| 240 | 949 | WSNGTNZN16 | CAVALIER EAST LLC - MD | Prefix |
| 240 | 964 | CUMBERLAND | VERIZON MARYLAND, INC. | Prefix |
| 240 | 965 | WSNG236Z13 | PAETEC COMMUNICATIONS, INC. - MD | Prefix |
| 240 | 970 | WSNGTNZN12 | BROADVOX-CLEC, LLC - MD | Prefix |
| 240 | 971 | FREDERICK | CENTURYLINK COMMUNICATIONS LLC | Prefix |
| 240 | 972 | LAUREL238 | BALTIMORE-WASHINGTON TELEPHONE (BWT) | Prefix |
| 240 | 976 | DAMASCS236 | BALTIMORE-WASHINGTON TELEPHONE (BWT) | Prefix |
| 240 | 979 | CUMBERLAND | LEVEL 3 COMMUNICATIONS, LLC - MD | Prefix |
| 240 | 985 | WILLIAMSPT | CENTURYLINK COMMUNICATIONS LLC | Prefix |
| 240 | 986 | NANJEMOY | XO MARYLAND, LLC | Prefix |
| 240 | 988 | WSHNGTNZN3 | SPRINT SPECTRUM L.P. | Prefix |
| 240 | 993 | INDIANHEAD | XO MARYLAND, LLC | Prefix |
| 240 | 994 | WSNGTNZN10 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 996 | BRUNSWICK | CENTURYLINK COMMUNICATIONS LLC | Prefix |
| 240 | 997 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 240 | 998 | HANCOCK | CENTURYLINK COMMUNICATIONS LLC | Prefix |
| 301 | 200 | INDIANHEAD | BANDWIDTH.COM CLEC, LLC - MD | Prefix |
| 301 | 202 | WSHNGTNZN2 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 301 | 203 | WSHNGTNZN6 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 204 | WSHNGTNZN2 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 301 | 205 | WSNG238Z14 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 206 | WSNG236Z13 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 207 | WSNG236Z13 | USA MOBILITY WIRELESS, INC. | Prefix |
| 301 | 208 | GAITHERSBG | VERIZON MARYLAND, INC. | Prefix |
| 301 | 209 | WSHNGTNZN4 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 210 | LAUREL236 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 212 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 213 | WSHNGTNZN3 | SPRINT SPECTRUM L.P. | Prefix |
| 301 | 214 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 215 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 216 | GAITHERSBG | VERIZON MARYLAND, INC. | Prefix |
| 301 | 217 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 218 | WSNG236Z14 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 219 | WSHNGTNZN2 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 301 | 220 | WSNG236Z13 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 221 | WSHNGTNZN2 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 301 | 222 | WSHNGTNZN2 | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | Prefix |
| 301 | 223 | WILLIAMSPT | VERIZON MARYLAND, INC. | Prefix |
| 301 | 224 | WSHNGTNZN2 | USA MOBILITY WIRELESS, INC. | Prefix |
| 301 | 225 | WSNG236Z14 | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | Prefix |
| 301 | 226 | WSHNGTNZN4 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 227 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 228 | FREDERICK | VERIZON MARYLAND, INC. | Prefix |
| 301 | 229 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 230 | WSNGTNZN11 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 231 | WSNGTNZN11 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 232 | ASHTON236 | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 301 | 233 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 234 | WSNGTNZN16 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 235 | WSNGTNZN16 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Prefix |
| 301 | 236 | WSNGTNZN12 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 237 | WSHNGTNZN3 | SPRINT SPECTRUM L.P. | Prefix |
| 301 | 238 | WSNGTNZN16 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 239 | WSHNGTNZN4 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 240 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 241 | HIGHFIELD | VERIZON MARYLAND, INC. | Prefix |
| 301 | 242 | BRANDYWINE | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Prefix |
| 301 | 243 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 244 | WSHNGTNZN3 | TELCOVE OPERATIONS, INC. - MD | Prefix |
| 301 | 245 | BITTINGER | VERIZON MARYLAND, INC. | Prefix |
| 301 | 246 | NANJEMOY | VERIZON MARYLAND, INC. | Prefix |
| 301 | 247 | LEONARDTN | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 301 | 248 | WSHNGTNZN6 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 249 | WSNG236Z14 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 250 | GAITHERSBG | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 301 | 251 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 252 | GAITHERSBG | SPRINT SPECTRUM L.P. | Prefix |
| 301 | 253 | DAMASCS236 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 254 | WSHNGTNZN3 | SPRINT SPECTRUM L.P. | Prefix |
| 301 | 255 | WSNGTNZN11 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 256 | LAUREL236 | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 301 | 257 | WSHNGTNZN3 | SPRINT SPECTRUM L.P. | Prefix |
| 301 | 258 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 259 | TOMPKINSVL | VERIZON MARYLAND, INC. | Prefix |
| 301 | 260 | ASHTON236 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 261 | WSNG238Z14 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 262 | WSNG236Z14 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 263 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 264 | MT SAVAGE | VERIZON MARYLAND, INC. | Prefix |
| 301 | 265 | WSHNGTNZN6 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 266 | WALDORF | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 301 | 267 | WSHNGTNZN3 | SPRINT SPECTRUM L.P. | Prefix |
| 301 | 268 | CUMBERLAND | USCOC OF CUMBERLAND, INC. DBA UNITED STATES CEL MD | Prefix |
| 301 | 269 | WSHNGTNZN2 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Prefix |
| 301 | 270 | WSHNGTNZN3 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 271 | THURMONT | VERIZON MARYLAND, INC. | Prefix |
| 301 | 272 | WSHNGTNZN2 | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 301 | 273 | WSHNGTNZN3 | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 301 | 274 | HUGHESVL | VERIZON MARYLAND, INC. | Prefix |
| 301 | 275 | WSHNGTNZN2 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 301 | 276 | WSHNGTNZN4 | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 301 | 277 | WSHNGTNZN4 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 278 | WSHNGTNZN5 | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 301 | 279 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 280 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 281 | WSHNGTNZN6 | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 301 | 282 | WSNGTNZN12 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 283 | WSHNGTNZN6 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 284 | WSNGTNZN10 | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 301 | 285 | WSHNGTNZN3 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 286 | WSNG236Z13 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 287 | WSNGTNZN11 | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 301 | 288 | WSNGTNZN12 | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 301 | 289 | WSNG236Z13 | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 301 | 290 | MECHANCSVL | VERIZON MARYLAND, INC. | Prefix |
| 301 | 291 | WSNG236Z14 | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 301 | 292 | WSHNGTNZN6 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 293 | MYERSVILLE | VERIZON MARYLAND, INC. | Prefix |
| 301 | 294 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 295 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 296 | WSNGTNZN10 | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 301 | 297 | WSNGTNZN16 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 298 | WSNG236Z15 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Prefix |
| 301 | 299 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 300 | WSHNGTNZN2 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 302 | HAGERSTOWN | SPRINT SPECTRUM L.P. - MD | Prefix |
| 301 | 303 | WSNG236Z13 | USA MOBILITY WIRELESS, INC. | Prefix |
| 301 | 304 | WALKERSVL | COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD | Prefix |
| 301 | 305 | FREDERICK | SPRINT SPECTRUM L.P. | Prefix |
| 301 | 306 | WSHNGTNZN4 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 307 | WSNG238Z13 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 308 | WSNG236Z13 | USA MOBILITY WIRELESS, INC. | Prefix |
| 301 | 309 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 310 | LAUREL238 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 312 | WSHNGTNZN2 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 301 | 313 | WSNG236Z13 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 314 | WSHNGTNZN4 | PAETEC COMMUNICATIONS, INC. - MD | Prefix |
| 301 | 315 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 316 | WSHNGTNZN5 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 317 | LAUREL236 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 318 | WSHNGTNZN2 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 301 | 319 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 320 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 321 | WSNGTNZN11 | TELCOVE OPERATIONS, INC. - MD | Prefix |
| 301 | 322 | WSHNGTNZN4 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 323 | LAUREL236 | LEVEL 3 TELECOM OF MARYLAND, LLC - MD | Prefix |
| 301 | 324 | WSHNGTNZN5 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 325 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 326 | WSHNGTNZN3 | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | Prefix |
| 301 | 327 | WSNG238Z15 | COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD | Prefix |
| 301 | 328 | WSHNGTNZN3 | COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD | Prefix |
| 301 | 329 | ASHTON238 | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | Prefix |
| 301 | 330 | GAITHERSBG | VERIZON MARYLAND, INC. | Prefix |
| 301 | 331 | HAGERSTOWN | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 301 | 332 | WSHNGTNZN3 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 301 | 333 | WSHNGTNZN5 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 334 | OAKLAND | VERIZON MARYLAND, INC. | Prefix |
| 301 | 335 | WSHNGTNZN2 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 301 | 336 | WSHNGTNZN5 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 337 | GAITHERSBG | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 301 | 338 | CUMBERLAND | IDT AMERICA CORP - MD | Prefix |
| 301 | 339 | WSNGTNZN10 | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | Prefix |
| 301 | 340 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 341 | WSHNGTNZN4 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 342 | LXTNPKGRML | VERIZON MARYLAND, INC. | Prefix |
| 301 | 343 | WSHNGTNZN5 | SPRINT SPECTRUM L.P. | Prefix |
| 301 | 344 | WSNG236Z13 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 345 | WSNG236Z13 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 346 | WSHNGTNZN3 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 301 | 347 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 348 | WSNGTNZN11 | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 301 | 349 | POOLESVL | VERIZON MARYLAND, INC. | Prefix |
| 301 | 350 | WSHNGTNZN5 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 351 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 352 | WSNG236Z14 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 353 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 354 | WSNGTNZN10 | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | Prefix |
| 301 | 355 | GAITHERSBG | VERIZON MARYLAND, INC. | Prefix |
| 301 | 356 | LAUREL236 | VDL, INC. DBA GLOBAL TELECOM BROKERS - MD | Prefix |
| 301 | 357 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 358 | WSNG236Z15 | LEVEL 3 COMMUNICATIONS, LLC - MD | Prefix |
| 301 | 359 | WESTERNPT | VERIZON MARYLAND, INC. | Prefix |
| 301 | 360 | FREDERICK | VERIZON MARYLAND, INC. | Prefix |
| 301 | 361 | WSHNGTNZN4 | LEVEL 3 TELECOM OF MARYLAND, LLC - MD | Prefix |
| 301 | 362 | LAUREL236 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 363 | DAMASCS240 | LEVEL 3 COMMUNICATIONS, LLC - MD | Prefix |
| 301 | 364 | WSHNGTNZN4 | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 301 | 365 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 366 | GAITHERSBG | SPRINT SPECTRUM L.P. | Prefix |
| 301 | 367 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 368 | DAMASCS236 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 369 | WSNG236Z13 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 370 | GAITHERSBG | SPRINT SPECTRUM L.P. | Prefix |
| 301 | 371 | MIDDLETOWN | VERIZON MARYLAND, INC. | Prefix |
| 301 | 372 | WSNGTNZN16 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 373 | LEONARDTN | VERIZON MARYLAND, INC. | Prefix |
| 301 | 374 | WALDORF | VERIZON MARYLAND, INC. | Prefix |
| 301 | 375 | INDIANHEAD | VERIZON MARYLAND, INC. | Prefix |
| 301 | 376 | LAUREL236 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 377 | LAUREL236 | COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD | Prefix |
| 301 | 378 | FREDERICK | COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD | Prefix |
| 301 | 379 | WSHNGTNZN3 | SPRINT SPECTRUM L.P. | Prefix |
| 301 | 380 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 382 | WSNGTNZN11 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 383 | WSNG236Z14 | COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD | Prefix |
| 301 | 384 | WSNGTNZN12 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 385 | WSHNGTNZN2 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 301 | 386 | WSHNGTNZN4 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 387 | OAKLAND | VERIZON MARYLAND, INC. | Prefix |
| 301 | 388 | WSNGTNZN12 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 389 | WSNG236Z13 | LEVEL 3 TELECOM OF MARYLAND, LLC - MD | Prefix |
| 301 | 390 | WSNG236Z14 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 391 | DAMASCS236 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 392 | LA PLATA | VERIZON MARYLAND, INC. | Prefix |
| 301 | 393 | HAGERSTOWN | VERIZON MARYLAND, INC. | Prefix |
| 301 | 394 | WSHNGTNZN3 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 395 | LAUREL238 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 396 | WALDORF | VERIZON MARYLAND, INC. | Prefix |
| 301 | 397 | WSNG236Z13 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 398 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 399 | WALDORF | SPRINT SPECTRUM L.P. | Prefix |
| 301 | 400 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 401 | FREDERICK | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 301 | 402 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 403 | WSHNGTNZN4 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 404 | WSHNGTNZN3 | SPRINT SPECTRUM L.P. | Prefix |
| 301 | 405 | WSHNGTNZN4 | PAETEC COMMUNICATIONS, INC. - MD | Prefix |
| 301 | 406 | WSHNGTNZN2 | USA MOBILITY WIRELESS, INC. | Prefix |
| 301 | 407 | GAITHERSBG | VERIZON MARYLAND, INC. | Prefix |
| 301 | 408 | WSHNGTNZN3 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 409 | WSNG236Z13 | USA MOBILITY WIRELESS, INC. | Prefix |
| 301 | 412 | WSHNGTNZN2 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 301 | 413 | WSNGTNZN11 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 414 | DAMASCS236 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 415 | WSHNGTNZN3 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 416 | MYERSVILLE | VERIZON MARYLAND, INC. | Prefix |
| 301 | 417 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 418 | FREDERICK | VERIZON MARYLAND, INC. | Prefix |
| 301 | 419 | WSNG236Z13 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 420 | WSHNGTNZN5 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 421 | ASHTON236 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 422 | WSHNGTNZN4 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 423 | WSHNGTNZN5 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 424 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 425 | WSNG236Z13 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 426 | WSNG236Z13 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 427 | WSHNGTNZN3 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 428 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 429 | WSHNGTNZN4 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 430 | WSNG236Z14 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 431 | WSHNGTNZN3 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 432 | KEEDYSVL | VERIZON MARYLAND, INC. | Prefix |
| 301 | 433 | WSHNGTNZN5 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 434 | WSHNGTNZN3 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 435 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 436 | WSHNGTNZN4 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 437 | WSHNGTNZN3 | SPRINT SPECTRUM L.P. | Prefix |
| 301 | 438 | WSNGTNZN12 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 439 | WSHNGTNZN3 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 440 | WSHNGTNZN5 | SPRINT SPECTRUM L.P. | Prefix |
| 301 | 441 | WSNG236Z13 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 442 | WSHNGTNZN3 | SPRINT SPECTRUM L.P. | Prefix |
| 301 | 443 | WSNGTNZN11 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 444 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 445 | WSHNGTNZN3 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 446 | WSNG236Z13 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 447 | EMMITSBURG | VERIZON MARYLAND, INC. | Prefix |
| 301 | 448 | WSHNGTNZN3 | COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD | Prefix |
| 301 | 449 | WSHNGTNZN5 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 451 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 452 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 453 | KITZMILLER | VERIZON MARYLAND, INC. | Prefix |
| 301 | 454 | WSHNGTNZN4 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 455 | WSHNGTNZN3 | SPRINT SPECTRUM L.P. | Prefix |
| 301 | 456 | WSHNGTNZN5 | COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD | Prefix |
| 301 | 457 | WSHNGTNZN3 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 458 | WSHNGTNZN4 | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | Prefix |
| 301 | 459 | WSHNGTNZN4 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 460 | WSNGTNZN11 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 461 | WSNGTNZN10 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 462 | MYERSVILLE | SPRINT SPECTRUM L.P. - MD | Prefix |
| 301 | 463 | LONACONING | VERIZON MARYLAND, INC. | Prefix |
| 301 | 464 | WSNG236Z14 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 465 | MYERSVILLE | SPRINT SPECTRUM L.P. - MD | Prefix |
| 301 | 466 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 467 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 468 | WSNGTNZN11 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 469 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 470 | WSNG236Z14 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 471 | FREDERICK | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 472 | MECHANCSVL | VERIZON MARYLAND, INC. | Prefix |
| 301 | 473 | FREDERICK | VERIZON MARYLAND, INC. | Prefix |
| 301 | 474 | WSNG236Z13 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 475 | LEONARDTN | VERIZON MARYLAND, INC. | Prefix |
| 301 | 476 | ASHTON236 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 477 | WSNG236Z13 | COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD | Prefix |
| 301 | 478 | FLINTSTONE | VERIZON MARYLAND, INC. | Prefix |
| 301 | 479 | WSNG236Z13 | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 301 | 480 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 481 | LEONARDTN | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 482 | DAMASCS236 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 483 | LAUREL236 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 484 | WSHNGTNZN4 | COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD | Prefix |
| 301 | 485 | WSHNGTNZN6 | COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD | Prefix |
| 301 | 486 | WSNG236Z13 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 487 | MYERSVILLE | VERIZON MARYLAND, INC. | Prefix |
| 301 | 488 | WSNG236Z13 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 489 | WSNG236Z13 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 490 | LAUREL236 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 491 | HAGERSTOWN | USCOC OF CUMBERLAND, INC. DBA UNITED STATES CEL MD | Prefix |
| 301 | 492 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 493 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 494 | WSNG238Z15 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 495 | WSHNGTNZN3 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 496 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 497 | LAUREL236 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 498 | LAUREL236 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 499 | WSHNGTNZN5 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 500 | WSHNGTNZN2 | XO MARYLAND, LLC | Prefix |
| 301 | 501 | OAKLAND | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 301 | 502 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 503 | WSHNGTNZN2 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 301 | 504 | WSHNGTNZN3 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 505 | WSHNGTNZN6 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 506 | WSNG236Z13 | USA MOBILITY WIRELESS, INC. | Prefix |
| 301 | 507 | WSNG236Z13 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 508 | MYERSVILLE | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 301 | 509 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 510 | WSNG236Z13 | USA MOBILITY WIRELESS, INC. | Prefix |
| 301 | 512 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 513 | WSNG236Z13 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 514 | FREDERICK | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 515 | GAITHERSBG | VERIZON MARYLAND, INC. | Prefix |
| 301 | 516 | WSHNGTNZN5 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 517 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 518 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 519 | GAITHERSBG | VERIZON MARYLAND, INC. | Prefix |
| 301 | 520 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 521 | WSHNGTNZN6 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 522 | WSNGTNZN11 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 523 | WSHNGTNZN3 | SPRINT SPECTRUM L.P. | Prefix |
| 301 | 524 | FREDERICK | SPRINT SPECTRUM L.P. | Prefix |
| 301 | 525 | GAITHERSBG | QUANTUM TELECOMMUNICATIONS, INC. - MD | Prefix |
| 301 | 526 | WSHNGTNZN3 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 301 | 527 | GAITHERSBG | VERIZON MARYLAND, INC. | Prefix |
| 301 | 528 | GAITHERSBG | VERIZON MARYLAND, INC. | Prefix |
| 301 | 529 | WSNGTNZN10 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 301 | 530 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 531 | WSHNGTNZN4 | STARPOWER COMMUNICATIONS, LLC - MD | Prefix |
| 301 | 532 | LAUREL238 | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | Prefix |
| 301 | 533 | OAKLAND | VERIZON MARYLAND, INC. | Prefix |
| 301 | 534 | INDIANHEAD | YMAX COMMUNICATIONS CORP. - MD | Prefix |
| 301 | 535 | WALDORF | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 301 | 536 | LEONARDTN | SPRINT SPECTRUM L.P. | Prefix |
| 301 | 537 | WSHNGTNZN3 | SPRINT SPECTRUM L.P. | Prefix |
| 301 | 538 | WSHNGTNZN2 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 301 | 539 | LA PLATA | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | Prefix |
| 301 | 540 | GAITHERSBG | VERIZON MARYLAND, INC. | Prefix |
| 301 | 541 | WSHNGTNZN5 | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | Prefix |
| 301 | 542 | WALDORF | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | Prefix |
| 301 | 543 | LAUREL236 | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | Prefix |
| 301 | 544 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 545 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 546 | WSHNGTNZN4 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 547 | WSHNGTNZN2 | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | Prefix |
| 301 | 548 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 549 | ASHTON236 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 551 | WSHNGTNZN3 | BALTIMORE-WASHINGTON TELEPHONE (BWT) | Prefix |
| 301 | 552 | WSNG236Z13 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 553 | WALDORF | USA MOBILITY WIRELESS, INC. | Prefix |
| 301 | 554 | WSHNGTNZN2 | USA MOBILITY WIRELESS, INC. | Prefix |
| 301 | 556 | GAITHERSBG | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | Prefix |
| 301 | 557 | WSHNGTNZN3 | BROADWING COMMUNICATIONS. LLC - MD | Prefix |
| 301 | 558 | WSNG236Z13 | USA MOBILITY WIRELESS, INC. | Prefix |
| 301 | 559 | WSHNGTNZN4 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 560 | WSHNGTNZN4 | PAETEC COMMUNICATIONS, INC. - MD | Prefix |
| 301 | 561 | WSHNGTNZN3 | BALTIMORE-WASHINGTON TELEPHONE (BWT) | Prefix |
| 301 | 562 | WSHNGTNZN3 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 563 | WSHNGTNZN3 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 564 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 565 | WSHNGTNZN3 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 566 | WSNG236Z13 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 567 | WSHNGTNZN6 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 568 | WSHNGTNZN5 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 569 | GAITHERSBG | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 570 | ASHTON236 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 571 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 572 | WSHNGTNZN3 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 573 | HAGERSTOWN | SPRINT SPECTRUM L.P. - MD | Prefix |
| 301 | 574 | WSNG236Z15 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 575 | LAUREL236 | US LEC OF MARYLAND, INC. | Prefix |
| 301 | 576 | WSHNGTNZN3 | PAETEC COMMUNICATIONS, INC. - MD | Prefix |
| 301 | 577 | WSHNGTNZN4 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 578 | WSHNGTNZN3 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 579 | BRANDYWINE | VERIZON MARYLAND, INC. | Prefix |
| 301 | 580 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 581 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 582 | HAGERSTOWN | VERIZON MARYLAND, INC. | Prefix |
| 301 | 583 | WSHNGTNZN4 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 584 | WSNGTNZN12 | BALTIMORE-WASHINGTON TELEPHONE (BWT) | Prefix |
| 301 | 585 | WSHNGTNZN3 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 586 | WSHNGTNZN3 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 587 | WSHNGTNZN3 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 588 | WSHNGTNZN3 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 589 | WSHNGTNZN3 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 590 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 591 | GAITHERSBG | PAETEC COMMUNICATIONS, INC. - MD | Prefix |
| 301 | 592 | WSHNGTNZN3 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 593 | WSHNGTNZN3 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 594 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 595 | WSNG236Z13 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 596 | LAUREL238 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 597 | HANCOCK | NEW FRONTIERS TELECOMMUNICATIONS, INC. | Prefix |
| 301 | 598 | WSNGTNZN12 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 599 | WSHNGTNZN5 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 600 | FREDERICK | VERIZON MARYLAND, INC. | Prefix |
| 301 | 601 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 602 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 603 | WSNGTNZN11 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 604 | LAUREL236 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 605 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 606 | FREDERICK | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 607 | DAMASCS240 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 608 | WSHNGTNZN3 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 609 | WALDORF | VERIZON MARYLAND, INC. | Prefix |
| 301 | 610 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 612 | WSNG238Z14 | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | Prefix |
| 301 | 613 | WSHNGTNZN3 | SPRINT SPECTRUM L.P. | Prefix |
| 301 | 614 | WSNG236Z13 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 615 | WSNG236Z13 | BANDWIDTH.COM CLEC, LLC - MD | Prefix |
| 301 | 616 | OAKLAND | USCOC OF CUMBERLAND, INC. DBA UNITED STATES CEL MD | Prefix |
| 301 | 617 | LAUREL236 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 618 | WSHNGTNZN4 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 619 | FREDERICK | VERIZON MARYLAND, INC. | Prefix |
| 301 | 620 | FREDERICK | VERIZON MARYLAND, INC. | Prefix |
| 301 | 621 | WSNG238Z14 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 622 | WSHNGTNZN3 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 623 | WSNG236Z13 | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | Prefix |
| 301 | 624 | FREDERICK | VERIZON MARYLAND, INC. | Prefix |
| 301 | 625 | WSHNGTNZN3 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 626 | WSHNGTNZN3 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 627 | WSNG236Z15 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 628 | WSHNGTNZN3 | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | Prefix |
| 301 | 629 | WSNG238Z14 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 630 | WSHNGTNZN6 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 631 | FREDERICK | VERIZON MARYLAND, INC. | Prefix |
| 301 | 632 | WALDORF | VERIZON MARYLAND, INC. | Prefix |
| 301 | 633 | WSHNGTNZN2 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 301 | 634 | WSHNGTNZN2 | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | Prefix |
| 301 | 635 | MYERSVILLE | NEW FRONTIERS TELECOMMUNICATIONS, INC. | Prefix |
| 301 | 636 | WSHNGTNZN5 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 637 | WSNGTNZN10 | LEVEL 3 COMMUNICATIONS, LLC - MD | Prefix |
| 301 | 638 | WALDORF | VERIZON MARYLAND, INC. | Prefix |
| 301 | 639 | FREDERICK | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 640 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 641 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 642 | WSHNGTNZN2 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 301 | 643 | WALDORF | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 644 | FREDERICK | VERIZON MARYLAND, INC. | Prefix |
| 301 | 645 | WALDORF | VERIZON MARYLAND, INC. | Prefix |
| 301 | 646 | WSHNGTNZN2 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 301 | 647 | WSNG236Z13 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 648 | WSHNGTNZN2 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 301 | 649 | WSNGTNZN11 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 650 | WSHNGTNZN3 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 651 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 652 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 653 | WALDORF | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 301 | 654 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 655 | WSHNGTNZN2 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 301 | 656 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 657 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 658 | ASHTON236 | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | Prefix |
| 301 | 659 | WALDORF | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 301 | 660 | KEEDYSVL | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 301 | 661 | WSHNGTNZN2 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 301 | 662 | FREDERICK | VERIZON MARYLAND, INC. | Prefix |
| 301 | 663 | FREDERICK | VERIZON MARYLAND, INC. | Prefix |
| 301 | 664 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 665 | HAGERSTOWN | VERIZON MARYLAND, INC. | Prefix |
| 301 | 666 | WSNG236Z14 | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | Prefix |
| 301 | 667 | MYERSVILLE | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 301 | 668 | FREDERICK | VERIZON MARYLAND, INC. | Prefix |
| 301 | 669 | WSHNGTNZN5 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 670 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 671 | HAGERSTOWN | NEW FRONTIERS TELECOMMUNICATIONS, INC. | Prefix |
| 301 | 672 | LXTNPKGRML | SPRINT SPECTRUM L.P. | Prefix |
| 301 | 673 | FREDERICK | NEW FRONTIERS TELECOMMUNICATIONS, INC. | Prefix |
| 301 | 674 | WSHNGTNZN2 | SPRINT SPECTRUM L.P. | Prefix |
| 301 | 675 | WSHNGTNZN3 | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | Prefix |
| 301 | 676 | FREDERICK | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 301 | 677 | WSNG236Z14 | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | Prefix |
| 301 | 678 | HANCOCK | VERIZON MARYLAND, INC. | Prefix |
| 301 | 679 | WSNGTNZN12 | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | Prefix |
| 301 | 680 | WSHNGTNZN3 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 681 | WSHNGTNZN3 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 682 | FREDERICK | VERIZON MARYLAND, INC. | Prefix |
| 301 | 683 | WSHNGTNZN4 | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | Prefix |
| 301 | 684 | INDIANHEAD | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | Prefix |
| 301 | 685 | DAMASCS236 | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | Prefix |
| 301 | 686 | WSHNGTNZN6 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 687 | FROSTBURG | VERIZON MARYLAND, INC. | Prefix |
| 301 | 688 | WSNG236Z13 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 689 | FROSTBURG | VERIZON MARYLAND, INC. | Prefix |
| 301 | 690 | LEONARDTN | IDT AMERICA CORP - MD | Prefix |
| 301 | 691 | POOLESVL | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | Prefix |
| 301 | 692 | WSNGTNZN11 | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | Prefix |
| 301 | 693 | FREDERICK | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | Prefix |
| 301 | 694 | FREDERICK | VERIZON MARYLAND, INC. | Prefix |
| 301 | 695 | FREDERICK | VERIZON MARYLAND, INC. | Prefix |
| 301 | 696 | FREDERICK | VERIZON MARYLAND, INC. | Prefix |
| 301 | 697 | CUMBERLAND | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 301 | 698 | FREDERICK | VERIZON MARYLAND, INC. | Prefix |
| 301 | 699 | WSHNGTNZN4 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 701 | WSNG236Z13 | BANDWIDTH.COM CLEC, LLC - MD | Prefix |
| 301 | 702 | WSHNGTNZN5 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 703 | MOUNT AIRY | LEVEL 3 COMMUNICATIONS, LLC - MD | Prefix |
| 301 | 704 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 705 | WALDORF | VERIZON MARYLAND, INC. | Prefix |
| 301 | 706 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 707 | CUMBERLAND | USCOC OF CUMBERLAND, INC. DBA UNITED STATES CEL MD | Prefix |
| 301 | 708 | LAUREL238 | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | Prefix |
| 301 | 710 | WALDORF | LEVEL 3 COMMUNICATIONS, LLC - MD | Prefix |
| 301 | 712 | FREDERICK | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 301 | 713 | WSHNGTNZN3 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 714 | HAGERSTOWN | VERIZON MARYLAND, INC. | Prefix |
| 301 | 715 | WSNG236Z15 | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | Prefix |
| 301 | 716 | WSNG236Z13 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 717 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 718 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 719 | WSNGTNZN16 | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | Prefix |
| 301 | 720 | BRANDYWINE | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | Prefix |
| 301 | 721 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 722 | CUMBERLAND | VERIZON MARYLAND, INC. | Prefix |
| 301 | 723 | CUMBERLAND | VERIZON MARYLAND, INC. | Prefix |
| 301 | 724 | CUMBERLAND | VERIZON MARYLAND, INC. | Prefix |
| 301 | 725 | LAUREL236 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 727 | WSHNGTNZN5 | BALTIMORE-WASHINGTON TELEPHONE (BWT) | Prefix |
| 301 | 728 | WSHNGTNZN3 | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | Prefix |
| 301 | 729 | CUMBERLAND | VERIZON MARYLAND, INC. | Prefix |
| 301 | 730 | MYERSVILLE | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 301 | 731 | WSHNGTNZN4 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 732 | FREDERICK | METRO PCS, INC. | Prefix |
| 301 | 733 | HAGERSTOWN | VERIZON MARYLAND, INC. | Prefix |
| 301 | 734 | WSHNGTNZN3 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 735 | WSHNGTNZN5 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 736 | WSHNGTNZN5 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 737 | LXTNPKGRML | VERIZON MARYLAND, INC. | Prefix |
| 301 | 738 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 739 | HAGERSTOWN | VERIZON MARYLAND, INC. | Prefix |
| 301 | 740 | GAITHERSBG | VERIZON MARYLAND, INC. | Prefix |
| 301 | 741 | LAUREL236 | LEVEL 3 COMMUNICATIONS, LLC - MD | Prefix |
| 301 | 742 | WSHNGTNZN2 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 301 | 743 | INDIANHEAD | VERIZON MARYLAND, INC. | Prefix |
| 301 | 744 | INDIANHEAD | VERIZON MARYLAND, INC. | Prefix |
| 301 | 745 | HAGERSTOWN | VERIZON MARYLAND, INC. | Prefix |
| 301 | 746 | FRIENDSVL | VERIZON MARYLAND, INC. | Prefix |
| 301 | 747 | WSHNGTNZN6 | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | Prefix |
| 301 | 748 | FREDERICK | SPRINT SPECTRUM L.P. | Prefix |
| 301 | 749 | WSHNGTNZN6 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 750 | FRIENDSVL | CORE COMMUNICATIONS, INC. - MD | Prefix |
| 301 | 751 | WALDORF | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 752 | WALDORF | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 753 | WSHNGTNZN6 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 754 | WSHNGTNZN3 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 755 | WSHNGTNZN3 | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 301 | 756 | WSNG236Z14 | LEVEL 3 TELECOM OF MARYLAND, LLC - MD | Prefix |
| 301 | 757 | LXTNPKGRML | VERIZON MARYLAND, INC. | Prefix |
| 301 | 758 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 759 | CUMBERLAND | VERIZON MARYLAND, INC. | Prefix |
| 301 | 760 | WSHNGTNZN2 | LEVEL 3 COMMUNICATIONS, LLC - MD | Prefix |
| 301 | 761 | WSNGTNZN11 | LEVEL 3 COMMUNICATIONS, LLC - MD | Prefix |
| 301 | 762 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 763 | WSHNGTNZN5 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 764 | WALDORF | VERIZON MARYLAND, INC. | Prefix |
| 301 | 765 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 766 | HAGERSTOWN | VERIZON MARYLAND, INC. | Prefix |
| 301 | 767 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 768 | WSHNGTNZN3 | LEVEL 3 COMMUNICATIONS, LLC - MD | Prefix |
| 301 | 769 | LEONARDTN | VERIZON MARYLAND, INC. | Prefix |
| 301 | 770 | WSNGTNZN11 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 771 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 772 | WSHNGTNZN4 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 773 | WSHNGTNZN4 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 774 | ASHTON236 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 775 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 776 | LAUREL236 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 777 | CUMBERLAND | VERIZON MARYLAND, INC. | Prefix |
| 301 | 778 | WSHNGTNZN5 | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 301 | 779 | WSHNGTNZN4 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 780 | WSNG236Z15 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 781 | FROSTBURG | NEW FRONTIERS TELECOMMUNICATIONS, INC. | Prefix |
| 301 | 782 | BRANDYWINE | VERIZON MARYLAND, INC. | Prefix |
| 301 | 783 | CUMBERLAND | NEW FRONTIERS TELECOMMUNICATIONS, INC. | Prefix |
| 301 | 784 | CUMBERLAND | VERIZON MARYLAND, INC. | Prefix |
| 301 | 785 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 786 | MCCOOLE | VERIZON MARYLAND, INC. | Prefix |
| 301 | 787 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 788 | FREDERICK | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 789 | WSHNGTNZN4 | CORE COMMUNICATIONS, INC. - MD | Prefix |
| 301 | 790 | HAGERSTOWN | VERIZON MARYLAND, INC. | Prefix |
| 301 | 791 | HAGERSTOWN | VERIZON MARYLAND, INC. | Prefix |
| 301 | 792 | WSHNGTNZN3 | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | Prefix |
| 301 | 793 | WSHNGTNZN3 | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | Prefix |
| 301 | 794 | WSNG236Z14 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 795 | WSNGTNZN10 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Prefix |
| 301 | 796 | WSNG236Z13 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 797 | HAGERSTOWN | VERIZON MARYLAND, INC. | Prefix |
| 301 | 798 | DAMASCS240 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 799 | KEEDYSVL | CORE COMMUNICATIONS, INC. - MD | Prefix |
| 301 | 800 | HAGERSTOWN | SPRINT SPECTRUM L.P. - MD | Prefix |
| 301 | 801 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 802 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 803 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 804 | ASHTON236 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Prefix |
| 301 | 805 | WSNG236Z14 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 806 | WSHNGTNZN3 | SPRINT SPECTRUM L.P. | Prefix |
| 301 | 807 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 808 | WSHNGTNZN5 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 809 | WSNG236Z14 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 810 | BUCKEYSTN | AT&T LOCAL | Prefix |
| 301 | 812 | WSNG238Z15 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 813 | WSHNGTNZN2 | BALTIMORE-WASHINGTON TELEPHONE (BWT) | Prefix |
| 301 | 814 | WSHNGTNZN2 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 301 | 815 | FREDERICK | VERIZON MARYLAND, INC. | Prefix |
| 301 | 816 | WSNGTNZN11 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 817 | WSHNGTNZN5 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 818 | WALDORF | BANDWIDTH.COM CLEC, LLC - MD | Prefix |
| 301 | 819 | WSHNGTNZN3 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 820 | GAITHERSBG | AT&T LOCAL | Prefix |
| 301 | 821 | LAUREL236 | AT&T LOCAL | Prefix |
| 301 | 822 | WSNGTNZN11 | AT&T LOCAL | Prefix |
| 301 | 823 | WSNG236Z13 | AT&T LOCAL | Prefix |
| 301 | 824 | SMITHSBURG | VERIZON MARYLAND, INC. | Prefix |
| 301 | 825 | WSNGTNZN10 | AT&T LOCAL | Prefix |
| 301 | 826 | LXTNPKGRML | VERIZON MARYLAND, INC. | Prefix |
| 301 | 827 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 828 | WSHNGTNZN2 | AT&T LOCAL | Prefix |
| 301 | 829 | MOUNT AIRY | VERIZON MARYLAND, INC. | Prefix |
| 301 | 830 | WSHNGTNZN3 | AT&T LOCAL | Prefix |
| 301 | 831 | DAMASCS240 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 832 | WSHNGTNZN4 | AT&T LOCAL | Prefix |
| 301 | 833 | WSNG236Z14 | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | Prefix |
| 301 | 834 | BRUNSWICK | VERIZON MARYLAND, INC. | Prefix |
| 301 | 835 | FREDERICK | VONAGE NETWORK INC. | Prefix |
| 301 | 836 | WSHNGTNZN5 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 837 | WSNG236Z13 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Prefix |
| 301 | 838 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 839 | WSHNGTNZN6 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 840 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 841 | WSHNGTNZN2 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Prefix |
| 301 | 842 | CLEAR SPG | VERIZON MARYLAND, INC. | Prefix |
| 301 | 843 | WSHNGTNZN6 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 844 | WSHNGTNZN3 | SPRINT SPECTRUM L.P. | Prefix |
| 301 | 845 | WALKERSVL | VERIZON MARYLAND, INC. | Prefix |
| 301 | 846 | FREDERICK | VERIZON MARYLAND, INC. | Prefix |
| 301 | 847 | WSNGTNZN12 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 848 | WALDORF | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 849 | OAKLAND | NEW FRONTIERS TELECOMMUNICATIONS, INC. | Prefix |
| 301 | 850 | WSNG236Z14 | LEVEL 3 COMMUNICATIONS, LLC - MD | Prefix |
| 301 | 851 | WSHNGTNZN4 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 852 | WSHNGTNZN4 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 853 | WSHNGTNZN4 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 854 | ASHTON238 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 855 | WSNG238Z15 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 856 | WSNGTNZN16 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 857 | CLEAR SPG | CORE COMMUNICATIONS, INC. - MD | Prefix |
| 301 | 858 | WSNG238Z14 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 859 | OAKLAND | LEVEL 3 COMMUNICATIONS, LLC - MD | Prefix |
| 301 | 860 | WSNG236Z14 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 861 | WALDORF | LEVEL 3 COMMUNICATIONS, LLC - MD | Prefix |
| 301 | 862 | LXTNPKGRML | VERIZON MARYLAND, INC. | Prefix |
| 301 | 863 | LXTNPKGRML | VERIZON MARYLAND, INC. | Prefix |
| 301 | 864 | WSHNGTNZN4 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 865 | NEW MARKET | VERIZON MARYLAND, INC. | Prefix |
| 301 | 866 | LXTNPKGRML | VERIZON MARYLAND, INC. | Prefix |
| 301 | 867 | WSNG236Z14 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Prefix |
| 301 | 868 | WSNGTNZN16 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 869 | GAITHERSBG | VERIZON MARYLAND, INC. | Prefix |
| 301 | 870 | WSHNGTNZN6 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 871 | WSNGTNZN11 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 872 | RIDGE | VERIZON MARYLAND, INC. | Prefix |
| 301 | 873 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 874 | BUCKEYSTN | VERIZON MARYLAND, INC. | Prefix |
| 301 | 875 | LAUREL236 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 876 | CUMBERLAND | LEVEL 3 COMMUNICATIONS, LLC - MD | Prefix |
| 301 | 877 | WSNGTNZN16 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 878 | BALTIMORE | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 301 | 879 | WSNGTNZN12 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 880 | LXTNPKGRML | LEVEL 3 COMMUNICATIONS, LLC - MD | Prefix |
| 301 | 881 | WSNGTNZN11 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 882 | NEW MARKET | CORE COMMUNICATIONS, INC. - MD | Prefix |
| 301 | 883 | WSHNGTNZN5 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 884 | MECHANCSVL | VERIZON MARYLAND, INC. | Prefix |
| 301 | 885 | WALDORF | VERIZON MARYLAND, INC. | Prefix |
| 301 | 886 | WSNG236Z13 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 887 | WSHNGTNZN4 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 888 | WSNGTNZN16 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 889 | WSNG238Z14 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 890 | WSNGTNZN12 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 891 | WSHNGTNZN3 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 892 | WSHNGTNZN4 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 893 | WSHNGTNZN6 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 894 | WSHNGTNZN6 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 895 | GRANTSVL | VERIZON MARYLAND, INC. | Prefix |
| 301 | 896 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 897 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 898 | FREDERICK | VERIZON MARYLAND, INC. | Prefix |
| 301 | 899 | WSHNGTNZN5 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 900 | WSHNGTNZN2 | ONVOY, LLC - MD | Prefix |
| 301 | 901 | WSNG236Z13 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 902 | WSNG236Z13 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 903 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 904 | LEONARDTN | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 905 | WSHNGTNZN3 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 906 | WSHNGTNZN2 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 301 | 907 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 908 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 909 | WSHNGTNZN5 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Prefix |
| 301 | 910 | WSHNGTNZN2 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 301 | 912 | WSNG238Z14 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 913 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 914 | OAKLAND | MOUNTAIN COMMUNICATIONS, LLC DBA PROCOM - MD | Prefix |
| 301 | 915 | WSHNGTNZN2 | STARPOWER COMMUNICATIONS, LLC - MD | Prefix |
| 301 | 916 | GAITHERSBG | VERIZON MARYLAND, INC. | Prefix |
| 301 | 917 | WSNGTNZN10 | STARPOWER COMMUNICATIONS, LLC - MD | Prefix |
| 301 | 918 | WSHNGTNZN4 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 919 | WSHNGTNZN2 | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 301 | 920 | WSHNGTNZN3 | STARPOWER COMMUNICATIONS, LLC - MD | Prefix |
| 301 | 921 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 922 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 923 | WSNG236Z13 | BANDWIDTH.COM CLEC, LLC - MD | Prefix |
| 301 | 924 | WSNGTNZN12 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 925 | WSHNGTNZN5 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 926 | GAITHERSBG | VERIZON MARYLAND, INC. | Prefix |
| 301 | 927 | WSHNGTNZN4 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 928 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 929 | WSNGTNZN11 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 930 | WSHNGTNZN3 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 931 | WSNG236Z13 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 932 | WALDORF | VERIZON MARYLAND, INC. | Prefix |
| 301 | 933 | WSNGTNZN11 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 934 | LA PLATA | VERIZON MARYLAND, INC. | Prefix |
| 301 | 935 | WSNG236Z13 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 936 | HAGERSTOWN | TELNYX LLC | Prefix |
| 301 | 937 | WSNG236Z13 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 938 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 939 | WSNG236Z13 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 940 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 941 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 942 | WSNGTNZN11 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 943 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 944 | GAITHERSBG | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Prefix |
| 301 | 945 | WSNGTNZN11 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Prefix |
| 301 | 946 | WSNGTNZN11 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 947 | GAITHERSBG | VERIZON MARYLAND, INC. | Prefix |
| 301 | 948 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 949 | WSNGTNZN11 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 951 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 952 | WSNG236Z15 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 953 | WSNG236Z13 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 955 | WSHNGTNZN4 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Prefix |
| 301 | 956 | GAITHERSBG | VERIZON MARYLAND, INC. | Prefix |
| 301 | 957 | LAUREL236 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Prefix |
| 301 | 960 | WSHNGTNZN3 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Prefix |
| 301 | 961 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 962 | WSNGTNZN11 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 963 | GAITHERSBG | VERIZON MARYLAND, INC. | Prefix |
| 301 | 964 | MYERSVILLE | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 301 | 965 | WSHNGTNZN6 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Prefix |
| 301 | 966 | WSNGTNZN12 | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Prefix |
| 301 | 967 | WSHNGTNZN5 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 968 | WSHNGTNZN2 | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 301 | 969 | BRUNSWICK | COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD | Prefix |
| 301 | 970 | WSNG238Z14 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 971 | WSHNGTNZN6 | STARPOWER COMMUNICATIONS, LLC - MD | Prefix |
| 301 | 972 | GAITHERSBG | VERIZON MARYLAND, INC. | Prefix |
| 301 | 973 | WSNG238Z14 | BANDWIDTH.COM CLEC, LLC - MD | Prefix |
| 301 | 974 | LAUREL236 | STARPOWER COMMUNICATIONS, LLC - MD | Prefix |
| 301 | 975 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 976 | WSHNGTNZN5 | BALTIMORE-WASHINGTON TELEPHONE (BWT) | Prefix |
| 301 | 977 | GAITHERSBG | VERIZON MARYLAND, INC. | Prefix |
| 301 | 978 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 979 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 980 | WSHNGTNZN3 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 301 | 981 | WSHNGTNZN5 | LEVEL 3 TELECOM OF MARYLAND, LLC - MD | Prefix |
| 301 | 982 | WSNG236Z13 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 983 | WSNGTNZN10 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 984 | WSNGTNZN11 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 985 | WSHNGTNZN4 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 986 | WSHNGTNZN2 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 987 | GAITHERSBG | VERIZON MARYLAND, INC. | Prefix |
| 301 | 988 | HAGERSTOWN | USCOC OF CUMBERLAND, INC. DBA UNITED STATES CEL MD | Prefix |
| 301 | 989 | WSNGTNZN12 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 990 | GAITHERSBG | VERIZON MARYLAND, INC. | Prefix |
| 301 | 991 | HAGERSTOWN | SPRINT SPECTRUM L.P. - MD | Prefix |
| 301 | 992 | HAGERSTOWN | SPRINT SPECTRUM L.P. - MD | Prefix |
| 301 | 993 | WSNG236Z13 | VERIZON MARYLAND, INC. | Prefix |
| 301 | 994 | LXTNPKGRML | VERIZON MARYLAND, INC. | Prefix |
| 301 | 995 | LXTNPKGRML | VERIZON MARYLAND, INC. | Prefix |
| 301 | 996 | WSHNGTNZN3 | SPRINT SPECTRUM L.P. | Prefix |
| 301 | 997 | LEONARDTN | VERIZON MARYLAND, INC. | Prefix |
| 301 | 998 | WSNGTNZN11 | VERIZON MARYLAND, INC. | Prefix |
| 410 | 200 | EASTON | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 410 | 202 | SALISBURY | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 410 | 203 | ELLICOTTCY | VERIZON MARYLAND, INC. | Prefix |
| 410 | 204 | ARBUTUS | VERIZON MARYLAND, INC. | Prefix |
| 410 | 205 | PIKESVILLE | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 410 | 206 | CATONSVL | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 410 | 207 | BALTIMORE | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 410 | 208 | BERLIN | VERIZON MARYLAND, INC. | Prefix |
| 410 | 209 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 210 | SALISBURY | AQUIS COMMUNICATIONS, INC. | Prefix |
| 410 | 212 | ANNAPOLIS | SPRINT SPECTRUM L.P. | Prefix |
| 410 | 213 | OCEAN CITY | VERIZON MARYLAND, INC. | Prefix |
| 410 | 214 | RISING SUN | CORE COMMUNICATIONS, INC. - MD | Prefix |
| 410 | 215 | BALTIMORE | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 410 | 216 | ANNAPOLIS | VERIZON MARYLAND, INC. | Prefix |
| 410 | 217 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 218 | BALTIMORE | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 410 | 219 | SALISBURY | VERIZON MARYLAND, INC. | Prefix |
| 410 | 220 | ELKRIDGE | SPRINT SPECTRUM L.P. | Prefix |
| 410 | 221 | CAMBRIDGE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 222 | SEVERN | VERIZON MARYLAND, INC. | Prefix |
| 410 | 223 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 224 | ANNAPOLIS | VERIZON MARYLAND, INC. | Prefix |
| 410 | 225 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 226 | OXFORD | VERIZON MARYLAND, INC. | Prefix |
| 410 | 227 | CATONSVL | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 410 | 228 | CAMBRIDGE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 229 | COCKEYSVL | VERIZON MARYLAND, INC. | Prefix |
| 410 | 230 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 231 | SOLOMONS | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 410 | 232 | BALTIMORE | USA MOBILITY WIRELESS, INC. | Prefix |
| 410 | 233 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 234 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 235 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 236 | TOWSON | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 410 | 237 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 238 | ESSEX | VERIZON MARYLAND, INC. | Prefix |
| 410 | 239 | REISTERSTN | VERIZON MARYLAND, INC. | Prefix |
| 410 | 240 | BALTIMORE | SPRINT SPECTRUM L.P. | Prefix |
| 410 | 241 | BALTIMORE | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 410 | 242 | ARBUTUS | VERIZON MARYLAND, INC. | Prefix |
| 410 | 243 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 244 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 245 | CATONSVL | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 410 | 246 | BALTIMORE | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 410 | 247 | ARBUTUS | VERIZON MARYLAND, INC. | Prefix |
| 410 | 248 | PARKVILLE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 249 | TOWSON | VERIZON MARYLAND, INC. | Prefix |
| 410 | 250 | OCEAN CITY | VERIZON MARYLAND, INC. | Prefix |
| 410 | 251 | SALISBURY | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 410 | 252 | TOWSON | VERIZON MARYLAND, INC. | Prefix |
| 410 | 253 | EASTON | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 410 | 254 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 255 | ARGRGBSNIS | VERIZON MARYLAND, INC. | Prefix |
| 410 | 256 | PARKVILLE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 257 | NORTHBEACH | VERIZON MARYLAND, INC. | Prefix |
| 410 | 258 | BALTIMORE | SPRINT SPECTRUM L.P. | Prefix |
| 410 | 259 | WESTMINSTR | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 410 | 260 | SEVERNA PK | VERIZON MARYLAND, INC. | Prefix |
| 410 | 261 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 262 | BALTIMORE | SPRINT SPECTRUM L.P. | Prefix |
| 410 | 263 | ANNAPOLIS | VERIZON MARYLAND, INC. | Prefix |
| 410 | 264 | WATERLO236 | VERIZON MARYLAND, INC. | Prefix |
| 410 | 265 | WOODLAWN | VERIZON MARYLAND, INC. | Prefix |
| 410 | 266 | ANNAPOLIS | VERIZON MARYLAND, INC. | Prefix |
| 410 | 267 | ANNAPOLIS | VERIZON MARYLAND, INC. | Prefix |
| 410 | 268 | ANNAPOLIS | VERIZON MARYLAND, INC. | Prefix |
| 410 | 269 | SEVERNA PK | VERIZON MARYLAND, INC. | Prefix |
| 410 | 270 | SALISBURY | REDI-CALL COMMUNICATIONS CO | Prefix |
| 410 | 271 | ANNAPOLIS | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 410 | 272 | ABERDEEN | VERIZON MARYLAND, INC. | Prefix |
| 410 | 273 | ABERDEEN | VERIZON MARYLAND, INC. | Prefix |
| 410 | 274 | BALTIMORE | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 410 | 275 | CECILTON | VERIZON MARYLAND, INC. | Prefix |
| 410 | 276 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 277 | WOODLAWN | VERIZON MARYLAND, INC. | Prefix |
| 410 | 278 | ABERDEEN | VERIZON MARYLAND, INC. | Prefix |
| 410 | 279 | ANNAPOLIS | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 410 | 280 | ANNAPOLIS | VERIZON MARYLAND, INC. | Prefix |
| 410 | 281 | WOODLAWN | VERIZON MARYLAND, INC. | Prefix |
| 410 | 282 | DUNDALK | VERIZON MARYLAND, INC. | Prefix |
| 410 | 283 | TOWSON | USA MOBILITY WIRELESS, INC. | Prefix |
| 410 | 284 | DUNDALK | VERIZON MARYLAND, INC. | Prefix |
| 410 | 285 | DUNDALK | VERIZON MARYLAND, INC. | Prefix |
| 410 | 286 | NORTHBEACH | VERIZON MARYLAND, INC. | Prefix |
| 410 | 287 | NORTH EAST | VERIZON MARYLAND, INC. | Prefix |
| 410 | 288 | DUNDALK | VERIZON MARYLAND, INC. | Prefix |
| 410 | 289 | OCEAN CITY | VERIZON MARYLAND, INC. | Prefix |
| 410 | 290 | COLUMBIA | VERIZON MARYLAND, INC. | Prefix |
| 410 | 291 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 292 | CATONSVL | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 410 | 293 | ANNAPOLIS | PAETEC COMMUNICATIONS, INC. - MD | Prefix |
| 410 | 294 | CATONSVL | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 410 | 295 | ANNAPOLIS | VERIZON MARYLAND, INC. | Prefix |
| 410 | 296 | TOWSON | VERIZON MARYLAND, INC. | Prefix |
| 410 | 297 | ABERDEEN | VERIZON MARYLAND, INC. | Prefix |
| 410 | 298 | WOODLAWN | VERIZON MARYLAND, INC. | Prefix |
| 410 | 299 | BALTIMORE | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 410 | 300 | ELKRIDGE | SPRINT SPECTRUM L.P. | Prefix |
| 410 | 301 | BALTIMORE | SPRINT SPECTRUM L.P. | Prefix |
| 410 | 302 | CATONSVL | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 410 | 303 | BALTIMORE | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 410 | 304 | QUEENSTOWN | IDT AMERICA CORP - MD | Prefix |
| 410 | 305 | ODENTON | VERIZON MARYLAND, INC. | Prefix |
| 410 | 306 | ABERDEEN | VERIZON MARYLAND, INC. | Prefix |
| 410 | 307 | TOWSON | VERIZON MARYLAND, INC. | Prefix |
| 410 | 308 | TOWSON | VERIZON MARYLAND, INC. | Prefix |
| 410 | 309 | COLUMBIA | VERIZON MARYLAND, INC. | Prefix |
| 410 | 310 | EASTON | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 410 | 312 | COLUMBIA | VERIZON MARYLAND, INC. | Prefix |
| 410 | 313 | ELLICOTTCY | VERIZON MARYLAND, INC. | Prefix |
| 410 | 314 | ARBUTUS | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 410 | 315 | SEVERNA PK | VERIZON MARYLAND, INC. | Prefix |
| 410 | 316 | COCKEYSVL | VERIZON MARYLAND, INC. | Prefix |
| 410 | 317 | ARGRGBSNIS | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 410 | 318 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 319 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 320 | ANNAPOLIS | SPRINT SPECTRUM L.P. | Prefix |
| 410 | 321 | TOWSON | VERIZON MARYLAND, INC. | Prefix |
| 410 | 322 | BEL AIR | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 410 | 323 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 324 | TOWSON | VERIZON MARYLAND, INC. | Prefix |
| 410 | 325 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 326 | SOLOMONS | VERIZON MARYLAND, INC. | Prefix |
| 410 | 327 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 328 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 329 | COCKEYSVL | VERIZON MARYLAND, INC. | Prefix |
| 410 | 330 | CAMBRIDGE | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 410 | 331 | ELKRIDGE | USA MOBILITY WIRELESS, INC. | Prefix |
| 410 | 332 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 333 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 334 | SALISBURY | VERIZON MARYLAND, INC. | Prefix |
| 410 | 335 | CHASE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 336 | BALTIMORE | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 410 | 337 | TOWSON | VERIZON MARYLAND, INC. | Prefix |
| 410 | 338 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 339 | TOWSON | VERIZON MARYLAND, INC. | Prefix |
| 410 | 340 | BALTIMORE | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 410 | 341 | SALISBURY | VERIZON MARYLAND, INC. | Prefix |
| 410 | 342 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 343 | SPARKSGLNC | VERIZON MARYLAND, INC. | Prefix |
| 410 | 344 | CHASE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 345 | PIKESVILLE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 346 | SILVER RUN | VERIZON MARYLAND, INC. | Prefix |
| 410 | 347 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 348 | STILL POND | VERIZON MARYLAND, INC. | Prefix |
| 410 | 349 | ANNAPOLIS | VERIZON MARYLAND, INC. | Prefix |
| 410 | 350 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 351 | BALTIMORE | USA MOBILITY WIRELESS, INC. | Prefix |
| 410 | 352 | BISHOPVL | VERIZON MARYLAND, INC. | Prefix |
| 410 | 353 | ANNAPOLIS | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 410 | 354 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 355 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 356 | PIKESVILLE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 357 | PARKTON | VERIZON MARYLAND, INC. | Prefix |
| 410 | 358 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 359 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 360 | ARGRGBSNIS | VERIZON MARYLAND, INC. | Prefix |
| 410 | 361 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 362 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 363 | PIKESVILLE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 364 | HILLSBORO | VERIZON MARYLAND, INC. | Prefix |
| 410 | 365 | BALTIMORE | SPRINT SPECTRUM L.P. | Prefix |
| 410 | 366 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 367 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 368 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 369 | BALTIMORE | LEVEL 3 TELECOM OF MARYLAND, LLC - MD | Prefix |
| 410 | 370 | CATONSVL | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 410 | 371 | BALTIMORE | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 410 | 372 | TOWSON | VERIZON MARYLAND, INC. | Prefix |
| 410 | 373 | TOWSON | USA MOBILITY WIRELESS, INC. | Prefix |
| 410 | 374 | HAMPSTEAD | VERIZON MARYLAND, INC. | Prefix |
| 410 | 375 | BALTIMORE | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 410 | 376 | VIENNA | VERIZON MARYLAND, INC. | Prefix |
| 410 | 377 | TOWSON | VERIZON MARYLAND, INC. | Prefix |
| 410 | 378 | PT DEPOSIT | VERIZON MARYLAND, INC. | Prefix |
| 410 | 379 | ELKRIDGE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 380 | SALISBURY | REDI-CALL COMMUNICATIONS CO | Prefix |
| 410 | 381 | COLUMBIA | VERIZON MARYLAND, INC. | Prefix |
| 410 | 382 | BALTIMORE | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 410 | 383 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 384 | SEVERNA PK | VERIZON MARYLAND, INC. | Prefix |
| 410 | 385 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 386 | WESTMINSTR | VERIZON MARYLAND, INC. | Prefix |
| 410 | 387 | BALTIMORE | BROADVIEW NETWORKS, INC. - MD | Prefix |
| 410 | 388 | SPARROWSPT | VERIZON MARYLAND, INC. | Prefix |
| 410 | 389 | BALTIMORE | USA MOBILITY WIRELESS, INC. | Prefix |
| 410 | 390 | OCEAN CITY | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | Prefix |
| 410 | 391 | ESSEX | VERIZON MARYLAND, INC. | Prefix |
| 410 | 392 | ELKTON | VERIZON MARYLAND, INC. | Prefix |
| 410 | 393 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 394 | SOLOMONS | VERIZON MARYLAND, INC. | Prefix |
| 410 | 395 | ARBUTUS | VERIZON MARYLAND, INC. | Prefix |
| 410 | 396 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 397 | WINGATE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 398 | ELKTON | VERIZON MARYLAND, INC. | Prefix |
| 410 | 399 | BEL AIR | VERIZON MARYLAND, INC. | Prefix |
| 410 | 400 | BALTIMORE | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | Prefix |
| 410 | 401 | BRYNPKLNCM | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 410 | 402 | CATONSVL | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 410 | 403 | COCKEYSVL | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 410 | 404 | BALTIMORE | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 410 | 405 | FORK | VERIZON MARYLAND, INC. | Prefix |
| 410 | 406 | ESSEX | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 410 | 407 | ELKRIDGE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 408 | TOWSON | USA MOBILITY WIRELESS, INC. | Prefix |
| 410 | 409 | BALTIMORE | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 410 | 412 | GLENBURNIE | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 410 | 413 | PIKESVILLE | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 410 | 414 | PRINCEFRCK | VERIZON MARYLAND, INC. | Prefix |
| 410 | 415 | PIKESVILLE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 416 | WATERLO236 | VERIZON MARYLAND, INC. | Prefix |
| 410 | 417 | EDGEWOOD | VERIZON MARYLAND, INC. | Prefix |
| 410 | 418 | ELLICOTTCY | VERIZON MARYLAND, INC. | Prefix |
| 410 | 419 | BALTIMORE | SPRINT SPECTRUM L.P. | Prefix |
| 410 | 420 | BEL AIR | VERIZON MARYLAND, INC. | Prefix |
| 410 | 421 | SEVERNA PK | VERIZON MARYLAND, INC. | Prefix |
| 410 | 422 | SALISBURY | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 410 | 423 | COLUMBIA | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | Prefix |
| 410 | 424 | GLENBURNIE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 425 | SMITH IS | VERIZON MARYLAND, INC. | Prefix |
| 410 | 426 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 427 | TOWSON | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | Prefix |
| 410 | 428 | CATONSVL | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 410 | 429 | WORTHINGTN | VERIZON MARYLAND, INC. | Prefix |
| 410 | 430 | SALISBURY | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 410 | 431 | SEVERNA PK | VERIZON MARYLAND, INC. | Prefix |
| 410 | 432 | SEVERNA PK | VERIZON MARYLAND, INC. | Prefix |
| 410 | 433 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 434 | TOWSON | USA MOBILITY WIRELESS, INC. | Prefix |
| 410 | 435 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 436 | EDGEWOOD | VERIZON MARYLAND, INC. | Prefix |
| 410 | 437 | ARGRGBSNIS | VERIZON MARYLAND, INC. | Prefix |
| 410 | 438 | SUDLERSVL | VERIZON MARYLAND, INC. | Prefix |
| 410 | 439 | ARGRGBSNIS | VERIZON MARYLAND, INC. | Prefix |
| 410 | 440 | CATONSVL | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 410 | 441 | ELKTON | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 410 | 442 | ELLICOTTCY | VERIZON MARYLAND, INC. | Prefix |
| 410 | 443 | EASTON | LEVEL 3 COMMUNICATIONS, LLC - MD | Prefix |
| 410 | 444 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 445 | BALTIMORE | USA MOBILITY WIRELESS, INC. | Prefix |
| 410 | 446 | CATONSVL | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 410 | 447 | COLUMBIA | USA MOBILITY WIRELESS, INC. | Prefix |
| 410 | 448 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 449 | SOLOMONS | BANDWIDTH.COM CLEC, LLC - MD | Prefix |
| 410 | 450 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 451 | CROFTON | VERIZON MARYLAND, INC. | Prefix |
| 410 | 452 | CARDIFF | VERIZON MARYLAND, INC. | Prefix |
| 410 | 453 | TOWSON | VERIZON MARYLAND, INC. | Prefix |
| 410 | 454 | BALTIMORE | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 410 | 455 | CATONSVL | VERIZON MARYLAND, INC. | Prefix |
| 410 | 456 | BALTIMORE | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 410 | 457 | DARLINGTON | VERIZON MARYLAND, INC. | Prefix |
| 410 | 458 | BALTIMORE | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 410 | 459 | FALLSTON | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 410 | 460 | ELKRIDGE | USA MOBILITY WIRELESS, INC. | Prefix |
| 410 | 461 | ELLICOTTCY | VERIZON MARYLAND, INC. | Prefix |
| 410 | 462 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 463 | TRAPPE | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 410 | 464 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 465 | ELLICOTTCY | VERIZON MARYLAND, INC. | Prefix |
| 410 | 466 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 467 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 468 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 469 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 470 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 471 | ELKRIDGE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 472 | SPARKSGLNC | VERIZON MARYLAND, INC. | Prefix |
| 410 | 473 | TOWSON | USA MOBILITY WIRELESS, INC. | Prefix |
| 410 | 474 | PRINCEFRCK | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 410 | 475 | TOWSON | USA MOBILITY WIRELESS, INC. | Prefix |
| 410 | 476 | TRAPPE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 477 | SPARROWSPT | VERIZON MARYLAND, INC. | Prefix |
| 410 | 478 | ELKRIDGE | USA MOBILITY WIRELESS, INC. | Prefix |
| 410 | 479 | DENTON | VERIZON MARYLAND, INC. | Prefix |
| 410 | 480 | ELLICOTTCY | VERIZON MARYLAND, INC. | Prefix |
| 410 | 482 | GREENSBORO | VERIZON MARYLAND, INC. | Prefix |
| 410 | 483 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 484 | PIKESVILLE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 485 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 486 | PIKESVILLE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 487 | GLENBURNIE | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 410 | 488 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 489 | GLENWOOD | VERIZON MARYLAND, INC. | Prefix |
| 410 | 490 | CENTREVL | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 410 | 491 | CATONSVL | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 410 | 492 | TOWSON | USA MOBILITY WIRELESS, INC. | Prefix |
| 410 | 493 | BALTIMORE | SPRINT SPECTRUM L.P. | Prefix |
| 410 | 494 | TOWSON | VERIZON MARYLAND, INC. | Prefix |
| 410 | 495 | PRINCEFRCK | VERIZON MARYLAND, INC. | Prefix |
| 410 | 496 | RANDALLSTN | VERIZON MARYLAND, INC. | Prefix |
| 410 | 497 | PARKVILLE | COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD | Prefix |
| 410 | 498 | COCKEYSVL | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | Prefix |
| 410 | 499 | BALTIMORE | SPRINT SPECTRUM L.P. | Prefix |
| 410 | 500 | BALTIMORE | SPRINT SPECTRUM L.P. | Prefix |
| 410 | 501 | ARBUTUS | LIGHTWAVE COMMUNICATIONS, LLC - MD | Prefix |
| 410 | 502 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 503 | ELKRIDGE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 504 | PIKESVILLE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 505 | ELLICOTTCY | VERIZON MARYLAND, INC. | Prefix |
| 410 | 506 | ELKTON | VERIZON MARYLAND, INC. | Prefix |
| 410 | 507 | ANNAPOLIS | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 410 | 508 | GLENBURNIE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 509 | WATERLO236 | BALTIMORE-WASHINGTON TELEPHONE (BWT) | Prefix |
| 410 | 510 | FORK | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | Prefix |
| 410 | 512 | TOWSON | VERIZON MARYLAND, INC. | Prefix |
| 410 | 513 | PARKVILLE | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | Prefix |
| 410 | 514 | SEVERN | VERIZON MARYLAND, INC. | Prefix |
| 410 | 515 | FORK | VERIZON MARYLAND, INC. | Prefix |
| 410 | 516 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 517 | REISTERSTN | VERIZON MARYLAND, INC. | Prefix |
| 410 | 518 | SEVERNA PK | VERIZON MARYLAND, INC. | Prefix |
| 410 | 519 | SEVERN | VERIZON MARYLAND, INC. | Prefix |
| 410 | 520 | OCEAN CITY | VERIZON MARYLAND, INC. | Prefix |
| 410 | 521 | RANDALLSTN | VERIZON MARYLAND, INC. | Prefix |
| 410 | 522 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 523 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 524 | OCEAN CITY | VERIZON MARYLAND, INC. | Prefix |
| 410 | 525 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 526 | REISTERSTN | VERIZON MARYLAND, INC. | Prefix |
| 410 | 527 | COCKEYSVL | VERIZON MARYLAND, INC. | Prefix |
| 410 | 528 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 529 | PARKVILLE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 530 | CATONSVL | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 410 | 531 | COLUMBIA | VERIZON MARYLAND, INC. | Prefix |
| 410 | 532 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 533 | ANNAPOLIS | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 410 | 534 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 535 | PRINCEFRCK | VERIZON MARYLAND, INC. | Prefix |
| 410 | 536 | ARBUTUS | VERIZON MARYLAND, INC. | Prefix |
| 410 | 537 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 538 | FORK | VERIZON MARYLAND, INC. | Prefix |
| 410 | 539 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 540 | ELKRIDGE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 541 | SEVERNA PK | VERIZON MARYLAND, INC. | Prefix |
| 410 | 542 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 543 | SALISBURY | VERIZON MARYLAND, INC. | Prefix |
| 410 | 544 | SEVERNA PK | VERIZON MARYLAND, INC. | Prefix |
| 410 | 545 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 546 | SALISBURY | VERIZON MARYLAND, INC. | Prefix |
| 410 | 547 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 548 | SALISBURY | VERIZON MARYLAND, INC. | Prefix |
| 410 | 549 | SYKESVILLE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 550 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 551 | SEVERN | VERIZON MARYLAND, INC. | Prefix |
| 410 | 552 | SYKESVILLE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 553 | GLENBURNIE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 554 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 556 | CHURCHHILL | VERIZON MARYLAND, INC. | Prefix |
| 410 | 557 | FORK | VERIZON MARYLAND, INC. | Prefix |
| 410 | 558 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 559 | PIKESVILLE | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | Prefix |
| 410 | 560 | TOWSON | VERIZON MARYLAND, INC. | Prefix |
| 410 | 561 | TOWSON | VERIZON MARYLAND, INC. | Prefix |
| 410 | 562 | ANNAPOLIS | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 410 | 563 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 564 | ELKRIDGE | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | Prefix |
| 410 | 565 | ARBUTUS | LEVEL 3 TELECOM OF MARYLAND, LLC - MD | Prefix |
| 410 | 566 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 567 | ELKRIDGE | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 410 | 568 | COCKEYSVL | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | Prefix |
| 410 | 569 | EDGEWOOD | VERIZON MARYLAND, INC. | Prefix |
| 410 | 570 | ANNAPOLIS | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 410 | 571 | ANNAPOLIS | VERIZON MARYLAND, INC. | Prefix |
| 410 | 572 | SALISBURY | VERIZON MARYLAND, INC. | Prefix |
| 410 | 573 | ANNAPOLIS | VERIZON MARYLAND, INC. | Prefix |
| 410 | 574 | ESSEX | VERIZON MARYLAND, INC. | Prefix |
| 410 | 575 | FORK | VERIZON MARYLAND, INC. | Prefix |
| 410 | 576 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 577 | PIKESVILLE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 578 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 579 | ELKRIDGE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 580 | PIKESVILLE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 581 | PIKESVILLE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 582 | GLENBURNIE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 583 | TOWSON | VERIZON MARYLAND, INC. | Prefix |
| 410 | 584 | COCKEYSVL | VERIZON MARYLAND, INC. | Prefix |
| 410 | 585 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 586 | PRINCEFRCK | VERIZON MARYLAND, INC. | Prefix |
| 410 | 587 | ARBUTUS | VERIZON MARYLAND, INC. | Prefix |
| 410 | 588 | BEL AIR | VERIZON MARYLAND, INC. | Prefix |
| 410 | 589 | BRYNPKLNCM | LEVEL 3 TELECOM OF MARYLAND, LLC - MD | Prefix |
| 410 | 590 | GLENBURNIE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 591 | BALTIMORE | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 410 | 592 | FORK | VERIZON MARYLAND, INC. | Prefix |
| 410 | 593 | FORK | VERIZON MARYLAND, INC. | Prefix |
| 410 | 594 | WOODLAWN | VERIZON MARYLAND, INC. | Prefix |
| 410 | 595 | GLENBURNIE | LEVEL 3 TELECOM OF MARYLAND, LLC - MD | Prefix |
| 410 | 596 | WESTMINSTR | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 410 | 597 | WOODLAWN | VERIZON MARYLAND, INC. | Prefix |
| 410 | 598 | BALTIMORE | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 410 | 599 | CATONSVL | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 410 | 600 | BERLIN | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 410 | 601 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 602 | PIKESVILLE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 603 | SALISBURY | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 410 | 604 | STEVENSVL | VERIZON MARYLAND, INC. | Prefix |
| 410 | 605 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 606 | WATERLO236 | VERIZON MARYLAND, INC. | Prefix |
| 410 | 607 | TOWSON | USA MOBILITY WIRELESS, INC. | Prefix |
| 410 | 608 | CATONSVL | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 410 | 609 | BRYNPKLNCM | VERIZON MARYLAND, INC. | Prefix |
| 410 | 610 | PRINCEFRCK | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 410 | 612 | EDGEWOOD | VERIZON MARYLAND, INC. | Prefix |
| 410 | 613 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 614 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 615 | CATONSVL | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 410 | 616 | TOWSON | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 410 | 617 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 618 | PERRYVILLE | IDT AMERICA CORP - MD | Prefix |
| 410 | 619 | WATERLO236 | VERIZON MARYLAND, INC. | Prefix |
| 410 | 620 | ELKTON | VERIZON MARYLAND, INC. | Prefix |
| 410 | 621 | PRINCEANNE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 622 | BALTIMORE | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 410 | 623 | MARION | VERIZON MARYLAND, INC. | Prefix |
| 410 | 624 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 625 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 626 | ANNAPOLIS | VERIZON MARYLAND, INC. | Prefix |
| 410 | 627 | BALTIMORE | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 410 | 628 | COCKEYSVL | VERIZON MARYLAND, INC. | Prefix |
| 410 | 629 | BERLIN | VERIZON MARYLAND, INC. | Prefix |
| 410 | 630 | CHASE | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 410 | 631 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 632 | SNOW HILL | VERIZON MARYLAND, INC. | Prefix |
| 410 | 633 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 634 | RIDGELY | VERIZON MARYLAND, INC. | Prefix |
| 410 | 635 | NEWWINDSOR | VERIZON MARYLAND, INC. | Prefix |
| 410 | 636 | BRYNPKLNCM | VERIZON MARYLAND, INC. | Prefix |
| 410 | 637 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 638 | BEL AIR | VERIZON MARYLAND, INC. | Prefix |
| 410 | 639 | ROCK HALL | VERIZON MARYLAND, INC. | Prefix |
| 410 | 640 | BALTIMORE | USA MOBILITY WIRELESS, INC. | Prefix |
| 410 | 641 | BERLIN | VERIZON MARYLAND, INC. | Prefix |
| 410 | 642 | PERRYVILLE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 643 | STEVENSVL | VERIZON MARYLAND, INC. | Prefix |
| 410 | 644 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 645 | WOODLAWN | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 410 | 646 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 647 | SEVERNA PK | VERIZON MARYLAND, INC. | Prefix |
| 410 | 648 | GALENA | VERIZON MARYLAND, INC. | Prefix |
| 410 | 649 | BALTIMORE | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | Prefix |
| 410 | 650 | DUNDALK | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 410 | 651 | PRINCEANNE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 652 | BEL AIR | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 410 | 653 | PIKESVILLE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 654 | PIKESVILLE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 655 | RANDALLSTN | VERIZON MARYLAND, INC. | Prefix |
| 410 | 656 | NORTH EAST | ARMSTRONG TELECOMMUNICATIONS, INC. - MD | Prefix |
| 410 | 657 | PARKVILLE | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 410 | 658 | RISING SUN | ARMSTRONG TELEPHONE CO. OF MARYLAND | Prefix |
| 410 | 659 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 660 | ELKRIDGE | SPRINT SPECTRUM L.P. | Prefix |
| 410 | 661 | PARKVILLE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 662 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 663 | PARKVILLE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 664 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 665 | PARKVILLE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 666 | COCKEYSVL | VERIZON MARYLAND, INC. | Prefix |
| 410 | 667 | COCKEYSVL | VERIZON MARYLAND, INC. | Prefix |
| 410 | 668 | PARKVILLE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 669 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 670 | EDGEWOOD | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 410 | 671 | EDGEWOOD | VERIZON MARYLAND, INC. | Prefix |
| 410 | 672 | ODENTON | VERIZON MARYLAND, INC. | Prefix |
| 410 | 673 | PRESTON | VERIZON MARYLAND, INC. | Prefix |
| 410 | 674 | ODENTON | VERIZON MARYLAND, INC. | Prefix |
| 410 | 675 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 676 | EDGEWOOD | VERIZON MARYLAND, INC. | Prefix |
| 410 | 677 | SALISBURY | VERIZON MARYLAND, INC. | Prefix |
| 410 | 678 | ELKRIDGE | USA MOBILITY WIRELESS, INC. | Prefix |
| 410 | 679 | FORK | VERIZON MARYLAND, INC. | Prefix |
| 410 | 680 | ELLICOTTCY | LEVEL 3 TELECOM OF MARYLAND, LLC - MD | Prefix |
| 410 | 681 | TOWSON | USA MOBILITY WIRELESS, INC. | Prefix |
| 410 | 682 | ESSEX | VERIZON MARYLAND, INC. | Prefix |
| 410 | 683 | COCKEYSVL | VERIZON MARYLAND, INC. | Prefix |
| 410 | 684 | GLENBURNIE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 685 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 686 | ESSEX | VERIZON MARYLAND, INC. | Prefix |
| 410 | 687 | ESSEX | VERIZON MARYLAND, INC. | Prefix |
| 410 | 688 | FALLSTON | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 410 | 689 | GLENBURNIE | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | Prefix |
| 410 | 690 | EASTON | AT&T LOCAL | Prefix |
| 410 | 691 | GLENBURNIE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 692 | JARRETTSVL | VERIZON MARYLAND, INC. | Prefix |
| 410 | 693 | ANNAPOLIS | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 410 | 694 | GLENBURNIE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 695 | ODENTON | VERIZON MARYLAND, INC. | Prefix |
| 410 | 696 | ELLICOTTCY | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 410 | 697 | MILLERSVL | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 410 | 698 | FORK | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 410 | 699 | CHESTERTN | SPRINT SPECTRUM L.P. | Prefix |
| 410 | 701 | RANDALLSTN | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 410 | 702 | REISTERSTN | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 410 | 703 | ANNAPOLIS | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 410 | 704 | TOWSON | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 410 | 705 | WATERLO236 | BANDWIDTH.COM CLEC, LLC - MD | Prefix |
| 410 | 706 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 707 | COLUMBIA | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 410 | 708 | CHESTERTN | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 410 | 709 | SPARROWSPT | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 410 | 710 | BALTIMORE | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | Prefix |
| 410 | 712 | ELKRIDGE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 713 | SALISBURY | LEVEL 3 COMMUNICATIONS, LLC - MD | Prefix |
| 410 | 714 | EASTON | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 410 | 715 | COLUMBIA | VERIZON MARYLAND, INC. | Prefix |
| 410 | 716 | TOWSON | VERIZON MARYLAND, INC. | Prefix |
| 410 | 717 | ELKRIDGE | LEVEL 3 TELECOM OF MARYLAND, LLC - MD | Prefix |
| 410 | 718 | CATONSVL | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 410 | 719 | CATONSVL | VERIZON MARYLAND, INC. | Prefix |
| 410 | 720 | ELLICOTTCY | VERIZON MARYLAND, INC. | Prefix |
| 410 | 721 | CROFTON | VERIZON MARYLAND, INC. | Prefix |
| 410 | 722 | WATERLO236 | VERIZON MARYLAND, INC. | Prefix |
| 410 | 723 | OCEAN CITY | VERIZON MARYLAND, INC. | Prefix |
| 410 | 724 | WATERLO236 | VERIZON MARYLAND, INC. | Prefix |
| 410 | 725 | EASTON | SPRINT SPECTRUM L.P. | Prefix |
| 410 | 726 | SALISBURY | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 410 | 727 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 728 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 729 | SEVERN | VERIZON MARYLAND, INC. | Prefix |
| 410 | 730 | COLUMBIA | VERIZON MARYLAND, INC. | Prefix |
| 410 | 731 | ANNAPOLIS | USA MOBILITY WIRELESS, INC. | Prefix |
| 410 | 732 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 733 | CATONSVL | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 410 | 734 | CHURCHVL | VERIZON MARYLAND, INC. | Prefix |
| 410 | 735 | BALTIMORE | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | Prefix |
| 410 | 736 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 737 | ARBUTUS | VERIZON MARYLAND, INC. | Prefix |
| 410 | 738 | WATERLO236 | VERIZON MARYLAND, INC. | Prefix |
| 410 | 739 | CENTREVL | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 410 | 740 | COLUMBIA | VERIZON MARYLAND, INC. | Prefix |
| 410 | 741 | WEST RIVER | VERIZON MARYLAND, INC. | Prefix |
| 410 | 742 | SALISBURY | VERIZON MARYLAND, INC. | Prefix |
| 410 | 743 | BALTIMORE | USA MOBILITY WIRELESS, INC. | Prefix |
| 410 | 744 | CATONSVL | VERIZON MARYLAND, INC. | Prefix |
| 410 | 745 | STMICHAELS | VERIZON MARYLAND, INC. | Prefix |
| 410 | 746 | BALTIMORE | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | Prefix |
| 410 | 747 | CATONSVL | VERIZON MARYLAND, INC. | Prefix |
| 410 | 748 | ELLICOTTCY | USA MOBILITY WIRELESS, INC. | Prefix |
| 410 | 749 | SALISBURY | VERIZON MARYLAND, INC. | Prefix |
| 410 | 750 | ELLICOTTCY | VERIZON MARYLAND, INC. | Prefix |
| 410 | 751 | WESTMINSTR | VERIZON MARYLAND, INC. | Prefix |
| 410 | 752 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 753 | PIKESVILLE | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 410 | 754 | FEDERALSBG | VERIZON MARYLAND, INC. | Prefix |
| 410 | 755 | WARWICK | VERIZON MARYLAND, INC. | Prefix |
| 410 | 756 | TANEYTOWN | VERIZON MARYLAND, INC. | Prefix |
| 410 | 757 | ANNAPOLIS | VERIZON MARYLAND, INC. | Prefix |
| 410 | 758 | CENTREVL | VERIZON MARYLAND, INC. | Prefix |
| 410 | 759 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 760 | GLENBURNIE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 761 | GLENBURNIE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 762 | GLENBURNIE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 763 | EASTON | VERIZON MARYLAND, INC. | Prefix |
| 410 | 764 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 765 | GLENBURNIE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 766 | GLENBURNIE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 767 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 768 | GLENBURNIE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 769 | TOWSON | VERIZON MARYLAND, INC. | Prefix |
| 410 | 770 | EASTON | VERIZON MARYLAND, INC. | Prefix |
| 410 | 771 | COCKEYSVL | VERIZON MARYLAND, INC. | Prefix |
| 410 | 772 | COLUMBIA | VERIZON MARYLAND, INC. | Prefix |
| 410 | 773 | COCKEYSVL | VERIZON MARYLAND, INC. | Prefix |
| 410 | 774 | CROFTON | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 410 | 775 | UNION BDG | VERIZON MARYLAND, INC. | Prefix |
| 410 | 776 | BEL AIR | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | Prefix |
| 410 | 777 | SEVERNA PK | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 410 | 778 | CHESTERTN | VERIZON MARYLAND, INC. | Prefix |
| 410 | 779 | BALTIMORE | LEVEL 3 COMMUNICATIONS, LLC - MD | Prefix |
| 410 | 780 | ESSEX | VERIZON MARYLAND, INC. | Prefix |
| 410 | 781 | ELLICOTTCY | VERIZON MARYLAND, INC. | Prefix |
| 410 | 782 | ELKRIDGE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 783 | BALTIMORE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 784 | DEALISLAND | VERIZON MARYLAND, INC. | Prefix |
| 410 | 785 | COCKEYSVL | VERIZON MARYLAND, INC. | Prefix |
| 410 | 786 | WOODLAWN | MCI WORLDCOM COMMUNICATIONS, INC. - MD | Prefix |
| 410 | 787 | GLENBURNIE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 788 | CATONSVL | VERIZON MARYLAND, INC. | Prefix |
| 410 | 789 | BRYNPKLNCM | VERIZON MARYLAND, INC. | Prefix |
| 410 | 790 | TOWSON | NEW CINGULAR WIRELESS PCS, LLC - DC | Prefix |
| 410 | 791 | WATERLO236 | VERIZON MARYLAND, INC. | Prefix |
| 410 | 792 | WATERLO236 | VERIZON MARYLAND, INC. | Prefix |
| 410 | 793 | SEVERNA PK | VERIZON MARYLAND, INC. | Prefix |
| 410 | 794 | COLUMBIA | LEVEL 3 TELECOM OF MARYLAND, LLC - MD | Prefix |
| 410 | 795 | SYKESVILLE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 796 | ELKRIDGE | VERIZON MARYLAND, INC. | Prefix |
| 410 | 797 | WATERLO236 | VERIZON MARYLAND, INC. | Prefix |
| 410 | 798 | WEST RIVER | VERIZON MARYLAND, INC. | Prefix |
| 410 | 799 | WATERLO238 | VERIZON MARYLAND, INC. | Prefix |
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