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Ad Unit
Place a vertical ad here.| Prefix | City | Company | Line type | Open |
|---|---|---|---|---|
| 309 | Washington | Cellco Partnership Dba Verizon Wireless - Md | Wireless | View |
| 310 | Frederick | Uscoc Of Cumberland Inc. Dba United States Cel Md | Landline | View |
| 312 | Herndon | Cavalier Telephone Mid-atlantic Llc - Md | Landline | View |
| 313 | Hagerstown | Verizon Maryland Inc. | Landline | View |
| 314 | Rockville | Verizon Maryland Inc. | Landline | View |
| 315 | Frederick | Verizon Maryland Inc. | Landline | View |
| 316 | Beltsville | Sprint Spectrum L.p. | Wireless | View |
| 317 | Lanham | Starpower Communications Llc - Md | Landline | View |
| 318 | Clinton | Verizon Maryland Inc. | Landline | View |
| 319 | Baltimore | Cellco Partnership Dba Verizon Wireless - Md | Wireless | View |
| 320 | Washington | Cavalier East Llc - Md | Landline | View |
| 321 | Cumberland | Uscoc Of Cumberland Inc. Dba United States Cel Md | Landline | View |
| 322 | Frederick | Core Communications Inc. - Md | Landline | View |
| 323 | Frederick | Core Communications Inc. - Md | Landline | View |
| 324 | Baltimore | Ymax Communications Corp. - Md | Landline | View |
| 325 | Chevy Chase | Core Communications Inc. - Md | Landline | View |
| 326 | Herndon | Cavalier Telephone Mid-atlantic Llc - Md | Landline | View |
| 327 | Chevy Chase | Core Communications Inc. - Md | Landline | View |
| 328 | Beltsville | Verizon Maryland Inc. | Landline | View |
| 329 | Frederick | Level 3 Communications Llc - Md | Landline | View |
| 330 | Beltsville | Sprint Spectrum L.p. | Wireless | View |
| 331 | Reston | Global Naps South Inc. - Md | Landline | View |
| 332 | Reston | Global Naps South Inc. - Md | Landline | View |
| 333 | Washington | Cavalier East Llc - Md | Landline | View |
| 334 | Unknown | Global Crossing Local Services Inc.-md | Landline | View |
| 335 | Herndon | Cavalier Telephone Mid-atlantic Llc - Md | Landline | View |
| 336 | Chevy Chase | Core Communications Inc. - Md | Landline | View |
| 337 | Reston | Global Naps South Inc. - Md | Landline | View |
| 338 | Annapolis Junction | Cellco Partnership Dba Verizon Wireless - Md | Wireless | View |
| 339 | Washington | Cavalier East Llc - Md | Landline | View |
| 340 | Beltsville | Sprint Spectrum L.p. | Wireless | View |
| 341 | Frederick | Mci Worldcom Communications Inc. - Md | Landline | View |
| 342 | Lanham | Starpower Communications Llc - Md | Landline | View |
| 343 | Hagerstown | Cellco Partnership Dba Verizon Wireless - Md | Wireless | View |
| 344 | Monrovia | New Cingular Wireless Pcs Llc - Dc | Wireless | View |
| 345 | Baltimore | Level 3 Communications Llc - Md | Landline | View |
| 346 | Washington | Sprint Spectrum L.p. | Wireless | View |
| 347 | Hagerstown | Bandwidth.com Clec Llc - Md | Landline | View |
| 348 | McLean | Level 3 Communications Llc - Md | Landline | View |
| 349 | Unknown | Global Crossing Local Services Inc.-md | Landline | View |
| 350 | Beltsville | Sprint Spectrum L.p. | Wireless | View |
| 351 | Beltsville | Sprint Spectrum L.p. | Wireless | View |
| 352 | Reston | Global Naps South Inc. - Md | Landline | View |
| 353 | Beltsville | Sprint Spectrum L.p. | Wireless | View |
| 354 | Beltsville | Sprint Spectrum L.p. | Wireless | View |
| 355 | Beltsville | Sprint Spectrum L.p. | Wireless | View |
| 356 | Frederick | Level 3 Communications Llc - Md | Landline | View |
| 357 | Frederick | Cellco Partnership Dba Verizon Wireless - Md | Wireless | View |
| 358 | Reston | Global Naps South Inc. - Md | Landline | View |
| 359 | Reston | Global Naps South Inc. - Md | Landline | View |
| 361 | Herndon | Cavalier Telephone Mid-atlantic Llc - Md | Landline | View |
| 362 | Cumberland | Verizon Maryland Inc. | Landline | View |
| 363 | Reston | Global Naps South Inc. - Md | Landline | View |
| 364 | Washington | Cavalier East Llc - Md | Landline | View |
| 365 | Chevy Chase | Baltimore-washington Telephone Bwt | Landline | View |
| 366 | Monrovia | At&t Local | Landline | View |
| 367 | Frederick | Sprint Spectrum L.p. | Wireless | View |
| 368 | Reston | Global Naps South Inc. - Md | Landline | View |
| 369 | Mount Airy | Core Communications Inc. - Md | Landline | View |
| 370 | Beltsville | Sprint Spectrum L.p. | Wireless | View |
| 371 | Reston | Global Naps South Inc. - Md | Landline | View |
| 372 | Silver Spring | Sprint Spectrum L.p. | Wireless | View |
| 373 | Odenton | Verizon Maryland Inc. | Landline | View |
| 374 | Unknown | Global Crossing Local Services Inc.-md | Landline | View |
| 375 | Silver Spring | Sprint Spectrum L.p. - Md | Wireless | View |
| 376 | Reston | Global Naps South Inc. - Md | Landline | View |
| 377 | Unknown | Global Crossing Local Services Inc.-md | Landline | View |
| 378 | Frederick | Core Communications Inc. - Md | Landline | View |
| 379 | Frederick | Verizon Maryland Inc. | Landline | View |
| 380 | Beltsville | Cellco Partnership Dba Verizon Wireless - Md | Wireless | View |
| 381 | Beltsville | New Cingular Wireless Pcs Llc - Dc | Wireless | View |
| 382 | Hagerstown | Teleport Communications America Llc - Md | Landline | View |
| 383 | Beltsville | New Cingular Wireless Pcs Llc - Dc | Wireless | View |
| 384 | Reston | Global Naps South Inc. - Md | Landline | View |
| 385 | Frederick | Verizon Maryland Inc. | Landline | View |
| 386 | Gaithersburg | Verizon Maryland Inc. | Landline | View |
| 387 | Washington | Cavalier East Llc - Md | Landline | View |
| 388 | Silver Spring | Sprint Spectrum L.p. - Md | Wireless | View |
| 389 | Washington | Atx Telecommunications Services Ltd | Landline | View |
| 390 | Herndon | Cavalier Telephone Mid-atlantic Llc - Md | Landline | View |
| 391 | Unknown | Global Crossing Local Services Inc.-md | Landline | View |
| 392 | Lanham | Starpower Communications Llc - Md | Landline | View |
| 393 | Annapolis Junction | Cellco Partnership Dba Verizon Wireless - Md | Wireless | View |
| 394 | Hagerstown | New Cingular Wireless Pcs Llc - Dc | Wireless | View |
| 395 | Herndon | Cavalier Telephone Mid-atlantic Llc - Md | Landline | View |
| 396 | Unknown | Global Crossing Local Services Inc.-md | Landline | View |
| 397 | Frederick | Cellco Partnership Dba Verizon Wireless - Md | Wireless | View |
| 398 | Silver Spring | Sprint Spectrum L.p. | Wireless | View |
| 399 | Washington | Xo Maryland Llc | Landline | View |
| 400 | Beltsville | Sprint Spectrum L.p. | Wireless | View |
| 401 | Beltsville | New Cingular Wireless Pcs Llc - Dc | Wireless | View |
| 402 | Reston | Mci Worldcom Communications Inc. - Md | Landline | View |
| 403 | Herndon | Cavalier Telephone Mid-atlantic Llc - Md | Landline | View |
| 404 | Washington | Xo Maryland Llc | Landline | View |
| 405 | Frederick | Us Lec Of Maryland Inc. | Landline | View |
| 406 | Washington | Leap Wireless Intl Inc. Dba Cricket Comm Inc. | Wireless | View |
| 407 | Unknown | Global Crossing Local Services Inc.-md | Landline | View |
| 408 | Beltsville | Leap Wireless Intl Inc. Dba Cricket Comm Inc. | Wireless | View |
| 409 | Monrovia | New Cingular Wireless Pcs Llc - Dc | Wireless | View |
| 412 | Washington | Sprint Spectrum L.p. | Wireless | View |
Page Overview
This page provides detailed information and helpful insights related to your search. All data is based on telecom assignment records and community user reports. Use the navigation above to explore related area codes, prefixes, and reported numbers.
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