301 Area Code: Location, Cities, Map And Time Zone
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© OpenStreetMap contributorsFor exact NPA boundaries see official 301 area code map
301-300-XXXX --- 301-399-XXXX
301-400-XXXX --- 301-499-XXXX
301-500-XXXX --- 301-599-XXXX
301-600-XXXX --- 301-699-XXXX
301-701-XXXX --- 301-799-XXXX
301-800-XXXX --- 301-899-XXXX
301-900-XXXX --- 301-998-XXXX
Area code 301 is in Maryland, USA , spanning 11 counties and serving 181 cities , including Germantown, Frederick or Silver Spring; it currently uses 784 prefixes , assigned from 301-200-XXXX through 301-998-XXXX.
In service since January 01, 1947, area code 301 is the parent Numbering Plan Area in overlay complex 301/240/227.
The current local time is .
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More Maryland area codes:
- 227
- 240
- 410
- 443
- 667
Locate any 301-NXX prefix:
301-200-XXXX --- 301-299-XXXX| NPANXX | Carrier1 | Area Served2 | Date3 |
|---|---|---|---|
| 301-200 | Bandwidth.com Clec | Indian Head | 2/24/2011 |
| 301-201 | New Cingular Wireless PCS | Washington Zone 10 | 11/7/2022 |
| 301-202 | New Cingular Wireless PCS | Washington Zone 2 | 12/19/2008 |
| 301-203 | Verizon Maryland | Washington Zone 6 | N/A |
| 301-204 | New Cingular Wireless PCS | Washington Zone 2 | N/A |
| 301-205 | Verizon Maryland | Washington Zone 14 | N/A |
| 301-206 | Verizon Maryland | Washington Zone 13 | N/A |
| 301-207 | USA Mobility Wireless | Washington Zone 13 | N/A |
| 301-208 | Verizon Maryland | Gaithersburg | N/A |
| 301-209 | Verizon Maryland | Washington Zone 4 | N/A |
| 301-210 | Verizon Maryland | Laurel | N/A |
| 301-212 | Verizon Maryland | Washington Zone 10 | N/A |
| 301-213 | Omnipoint Communications Cap Operations | Washington Zone 3 | N/A |
| 301-214 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-215 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-216 | Verizon Maryland | Gaithersburg | N/A |
| 301-217 | Verizon Maryland | Washington Zone 10 | N/A |
| 301-218 | Verizon Maryland | Washington Zone 14 | N/A |
| 301-219 | New Cingular Wireless PCS | Washington Zone 2 | N/A |
| 301-220 | Verizon Maryland | Washington Zone 13 | N/A |
| 301-221 | New Cingular Wireless PCS | Washington Zone 2 | N/A |
| 301-222 | Paetec Itel | Washington Zone 2 | N/A |
| 301-223 | Verizon Maryland | Williamsport | N/A |
| 301-224 | USA Mobility Wireless | Washington Zone 2 | N/A |
| 301-225 | Teleport Communications America | Washington Zone 14 | 5/21/2009 |
| 301-226 | Verizon Maryland | Washington Zone 4 | N/A |
| 301-227 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-228 | Verizon Maryland | Frederick | N/A |
| 301-229 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-230 | Verizon Maryland | Washington Zone 11 | N/A |
| 301-231 | Verizon Maryland | Washington Zone 11 | N/A |
| 301-232 | MCIMetro Access Transmission Services | Ashton | N/A |
| 301-233 | Cellco Partnership | Washington Zone 3 | N/A |
| 301-234 | Verizon Maryland | Washington Zone 16 | N/A |
| 301-235 | MCIMetro Access Transmission Services | Washington Zone 16 | N/A |
| 301-236 | Verizon Maryland | Washington Zone 12 | N/A |
| 301-237 | Omnipoint Communications Cap Operations | Washington Zone 3 | N/A |
| 301-238 | Verizon Maryland | Washington Zone 16 | N/A |
| 301-239 | Verizon Maryland | Washington Zone 4 | N/A |
| 301-240 | Verizon Maryland | Washington Zone 10 | N/A |
| 301-241 | Verizon Maryland | Highfield | N/A |
| 301-242 | MCIMetro Access Transmission Services | Brandywine | N/A |
| 301-243 | Verizon Maryland | Washington Zone 2 | 7/20/2006 |
| 301-244 | Paetec Itel | Washington Zone 3 | N/A |
| 301-245 | Verizon Maryland | Bittinger | N/A |
| 301-246 | Verizon Maryland | Nanjemoy | N/A |
| 301-247 | New Cingular Wireless PCS | Leonardtown | N/A |
| 301-248 | Verizon Maryland | Washington Zone 6 | N/A |
| 301-249 | Verizon Maryland | Washington Zone 14 | N/A |
| 301-250 | MCIMetro Access Transmission Services | Gaithersburg | N/A |
| 301-251 | Verizon Maryland | Washington Zone 10 | N/A |
| 301-252 | MetroPCS | Gaithersburg | N/A |
| 301-253 | Verizon Maryland | Damascus | N/A |
| 301-254 | Omnipoint Communications Cap Operations | Washington Zone 3 | N/A |
| 301-255 | Verizon Maryland | Washington Zone 11 | N/A |
| 301-256 | MCIMetro Access Transmission Services | Laurel | N/A |
| 301-257 | Omnipoint Communications Cap Operations | Washington Zone 3 | N/A |
| 301-258 | Verizon Maryland | Washington Zone 10 | N/A |
| 301-259 | Verizon Maryland | Tompkinsville | N/A |
| 301-260 | Verizon Maryland | Ashton | N/A |
| 301-261 | Verizon Maryland | Washington Zone 14 | N/A |
| 301-262 | Verizon Maryland | Washington Zone 14 | N/A |
| 301-263 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-264 | Verizon Maryland | Mt Savage | N/A |
| 301-265 | Verizon Maryland | Washington Zone 6 | N/A |
| 301-266 | New Cingular Wireless PCS | Waldorf | N/A |
| 301-267 | Omnipoint Communications Cap Operations | Washington Zone 3 | 10/4/2011 |
| 301-268 | Uscoc Of Cumberland | Cumberland | N/A |
| 301-269 | MCIMetro Access Transmission Services | Washington Zone 2 | 11/11/2014 |
| 301-270 | Verizon Maryland | Washington Zone 3 | N/A |
| 301-271 | Verizon Maryland | Thurmont | N/A |
| 301-272 | MCIMetro Access Transmission Services | Washington Zone 2 | N/A |
| 301-273 | MCIMetro Access Transmission Services | Washington Zone 3 | N/A |
| 301-274 | Verizon Maryland | Hughesville | N/A |
| 301-275 | New Cingular Wireless PCS | Washington Zone 2 | N/A |
| 301-276 | MCIMetro Access Transmission Services | Washington Zone 4 | N/A |
| 301-277 | Verizon Maryland | Washington Zone 4 | N/A |
| 301-278 | MCIMetro Access Transmission Services | Washington Zone 5 | N/A |
| 301-279 | Verizon Maryland | Washington Zone 10 | N/A |
| 301-280 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-281 | MCIMetro Access Transmission Services | Washington Zone 6 | N/A |
| 301-282 | Verizon Maryland | Washington Zone 12 | N/A |
| 301-283 | Verizon Maryland | Washington Zone 6 | N/A |
| 301-284 | MCIMetro Access Transmission Services | Washington Zone 10 | N/A |
| 301-285 | Verizon Maryland | Washington Zone 3 | N/A |
| 301-286 | Verizon Maryland | Washington Zone 13 | N/A |
| 301-287 | MCIMetro Access Transmission Services | Washington Zone 11 | N/A |
| 301-288 | MCIMetro Access Transmission Services | Washington Zone 12 | N/A |
| 301-289 | MCIMetro Access Transmission Services | Washington Zone 13 | N/A |
| 301-290 | Verizon Maryland | Mechanicsville | N/A |
| 301-291 | MCIMetro Access Transmission Services | Washington Zone 14 | N/A |
| 301-292 | Verizon Maryland | Washington Zone 6 | N/A |
| 301-293 | Verizon Maryland | Myersville | N/A |
| 301-294 | Verizon Maryland | Washington Zone 10 | N/A |
| 301-295 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-296 | MCIMetro Access Transmission Services | Washington Zone 10 | N/A |
| 301-297 | Verizon Maryland | Washington Zone 16 | N/A |
| 301-298 | MCIMetro Access Transmission Services | Washington Zone 15 | N/A |
| 301-299 | Verizon Maryland | Washington Zone 10 | N/A |
| NPANXX | Carrier1 | Area Served2 | Date3 |
|---|---|---|---|
| 301-300 | Cellco Partnership | Washington Zone 2 | 3/30/2007 |
| 301-301 | Onvoy | Gaithersburg | 8/30/2022 |
| 301-302 | MetroPCS | Hagerstown | 10/5/2004 |
| 301-303 | USA Mobility Wireless | Washington Zone 13 | N/A |
| 301-304 | Comcast IP Phone | Walkersville | 3/6/2007 |
| 301-305 | MetroPCS | Frederick | N/A |
| 301-306 | Verizon Maryland | Washington Zone 4 | N/A |
| 301-307 | Verizon Maryland | Washington Zone 13 | N/A |
| 301-308 | USA Mobility Wireless | Washington Zone 13 | N/A |
| 301-309 | Verizon Maryland | Washington Zone 10 | N/A |
| 301-310 | Verizon Maryland | Laurel | N/A |
| 301-312 | New Cingular Wireless PCS | Washington Zone 2 | N/A |
| 301-313 | Verizon Maryland | Washington Zone 13 | N/A |
| 301-314 | Paetec Itel | Washington Zone 4 | N/A |
| 301-315 | Verizon Maryland | Washington Zone 10 | N/A |
| 301-316 | Verizon Maryland | Washington Zone 5 | N/A |
| 301-317 | Verizon Maryland | Laurel | N/A |
| 301-318 | New Cingular Wireless PCS | Washington Zone 2 | N/A |
| 301-319 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-320 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-321 | Onvoy | Washington Zone 11 | N/A |
| 301-322 | Verizon Maryland | Washington Zone 4 | N/A |
| 301-323 | Level 3 Telecom Of Maryland | Laurel | N/A |
| 301-324 | Verizon Maryland | Washington Zone 5 | N/A |
| 301-325 | Cellco Partnership | Washington Zone 3 | N/A |
| 301-326 | Omnipoint Communications Cap Operations | Washington Zone 3 | N/A |
| 301-327 | Comcast IP Phone | Washington Zone 15 | 3/9/2006 |
| 301-328 | Comcast IP Phone | Washington Zone 3 | 6/21/2006 |
| 301-329 | Onvoy | Ashton | N/A |
| 301-330 | Verizon Maryland | Gaithersburg | N/A |
| 301-331 | New Cingular Wireless PCS | Hagerstown | N/A |
| 301-332 | New Cingular Wireless PCS | Washington Zone 3 | N/A |
| 301-333 | Verizon Maryland | Washington Zone 5 | N/A |
| 301-334 | Verizon Maryland | Oakland | N/A |
| 301-335 | New Cingular Wireless PCS | Washington Zone 2 | N/A |
| 301-336 | Verizon Maryland | Washington Zone 5 | N/A |
| 301-337 | MCIMetro Access Transmission Services | Gaithersburg | N/A |
| 301-338 | Idt America | Cumberland | 1/31/2006 |
| 301-339 | Paetec Itel | Washington Zone 10 | N/A |
| 301-340 | Verizon Maryland | Washington Zone 10 | N/A |
| 301-341 | Verizon Maryland | Washington Zone 4 | N/A |
| 301-342 | Verizon Maryland | Lexington Park-Great Mills | N/A |
| 301-343 | MetroPCS | Washington Zone 5 | N/A |
| 301-344 | Verizon Maryland | Washington Zone 13 | N/A |
| 301-345 | Verizon Maryland | Washington Zone 13 | N/A |
| 301-346 | New Cingular Wireless PCS | Washington Zone 3 | N/A |
| 301-347 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-348 | MCIMetro Access Transmission Services | Washington Zone 11 | N/A |
| 301-349 | Verizon Maryland | Poolesville | N/A |
| 301-350 | Verizon Maryland | Washington Zone 5 | N/A |
| 301-351 | Cellco Partnership | Washington Zone 3 | N/A |
| 301-352 | Verizon Maryland | Washington Zone 14 | N/A |
| 301-353 | Verizon Maryland | Washington Zone 10 | N/A |
| 301-354 | Teleport Communications America | Washington Zone 10 | N/A |
| 301-355 | Verizon Maryland | Gaithersburg | 12/8/2005 |
| 301-356 | Vdl | Laurel | N/A |
| 301-357 | Cellco Partnership | Washington Zone 3 | 10/12/2006 |
| 301-358 | Level 3 Communications | Washington Zone 15 | N/A |
| 301-359 | Verizon Maryland | Westernport | N/A |
| 301-360 | Verizon Maryland | Frederick | N/A |
| 301-361 | Level 3 Telecom Of Maryland | Washington Zone 4 | N/A |
| 301-362 | Verizon Maryland | Laurel | N/A |
| 301-363 | Level 3 Communications | Damascus | 8/16/2006 |
| 301-364 | MCIMetro Access Transmission Services | Washington Zone 4 | N/A |
| 301-365 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-366 | MetroPCS | Gaithersburg | N/A |
| 301-367 | Cellco Partnership | Washington Zone 3 | N/A |
| 301-368 | Verizon Maryland | Damascus | N/A |
| 301-369 | Verizon Maryland | Washington Zone 13 | N/A |
| 301-370 | MetroPCS | Gaithersburg | N/A |
| 301-371 | Verizon Maryland | Middletown | N/A |
| 301-372 | Verizon Maryland | Washington Zone 16 | N/A |
| 301-373 | Verizon Maryland | Leonardtown | N/A |
| 301-374 | Verizon Maryland | Waldorf | N/A |
| 301-375 | Verizon Maryland | Indian Head | N/A |
| 301-376 | Verizon Maryland | Laurel | N/A |
| 301-377 | Comcast IP Phone | Laurel | N/A |
| 301-378 | Comcast IP Phone | Frederick | 2/20/2007 |
| 301-379 | Omnipoint Communications Cap Operations | Washington Zone 3 | N/A |
| 301-380 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-381 | Onvoy | Washington Zone 2 | 7/15/2022 |
| 301-382 | Verizon Maryland | Washington Zone 11 | N/A |
| 301-383 | Comcast IP Phone | Washington Zone 14 | N/A |
| 301-384 | Verizon Maryland | Washington Zone 12 | N/A |
| 301-385 | New Cingular Wireless PCS | Washington Zone 2 | N/A |
| 301-386 | Verizon Maryland | Washington Zone 4 | N/A |
| 301-387 | Verizon Maryland | Oakland | N/A |
| 301-388 | Verizon Maryland | Washington Zone 12 | N/A |
| 301-389 | Level 3 Telecom Of Maryland | Washington Zone 13 | N/A |
| 301-390 | Verizon Maryland | Washington Zone 14 | N/A |
| 301-391 | Verizon Maryland | Damascus | N/A |
| 301-392 | Verizon Maryland | La Plata | N/A |
| 301-393 | Verizon Maryland | Hagerstown | N/A |
| 301-394 | Verizon Maryland | Washington Zone 3 | N/A |
| 301-395 | Cellco Partnership | Laurel | N/A |
| 301-396 | Verizon Maryland | Waldorf | N/A |
| 301-397 | Verizon Maryland | Washington Zone 13 | N/A |
| 301-398 | Verizon Maryland | Washington Zone 10 | 10/9/2003 |
| 301-399 | MetroPCS | Waldorf | N/A |
| NPANXX | Carrier1 | Area Served2 | Date3 |
|---|---|---|---|
| 301-400 | Verizon Maryland | Washington Zone 2 | 3/29/2010 |
| 301-401 | New Cingular Wireless PCS | Frederick | N/A |
| 301-402 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-403 | Verizon Maryland | Washington Zone 4 | N/A |
| 301-404 | Omnipoint Communications Cap Operations | Washington Zone 3 | N/A |
| 301-405 | Paetec Itel | Washington Zone 4 | N/A |
| 301-406 | USA Mobility Wireless | Washington Zone 2 | N/A |
| 301-407 | Verizon Maryland | Gaithersburg | N/A |
| 301-408 | Verizon Maryland | Washington Zone 3 | N/A |
| 301-409 | Onvoy Spectrum | Washington Zone 2 | 12/21/2021 |
| 301-410 | Onvoy Spectrum | Washington Zone 6 | 5/5/2022 |
| 301-412 | New Cingular Wireless PCS | Washington Zone 2 | N/A |
| 301-413 | Verizon Maryland | Washington Zone 11 | N/A |
| 301-414 | Verizon Maryland | Damascus | N/A |
| 301-415 | Verizon Maryland | Washington Zone 3 | N/A |
| 301-416 | Verizon Maryland | Myersville | N/A |
| 301-417 | Verizon Maryland | Washington Zone 10 | N/A |
| 301-418 | Verizon Maryland | Frederick | 11/20/2002 |
| 301-419 | Verizon Maryland | Washington Zone 13 | N/A |
| 301-420 | Verizon Maryland | Washington Zone 5 | N/A |
| 301-421 | Verizon Maryland | Ashton | N/A |
| 301-422 | Verizon Maryland | Washington Zone 4 | N/A |
| 301-423 | Verizon Maryland | Washington Zone 5 | N/A |
| 301-424 | Verizon Maryland | Washington Zone 10 | N/A |
| 301-425 | Verizon Maryland | Washington Zone 13 | N/A |
| 301-426 | Verizon Maryland | Washington Zone 13 | N/A |
| 301-427 | Verizon Maryland | Washington Zone 3 | N/A |
| 301-428 | Verizon Maryland | Washington Zone 10 | N/A |
| 301-429 | Verizon Maryland | Washington Zone 4 | N/A |
| 301-430 | Verizon Maryland | Washington Zone 14 | N/A |
| 301-431 | Verizon Maryland | Washington Zone 3 | N/A |
| 301-432 | Verizon Maryland | Keedysville | N/A |
| 301-433 | Verizon Maryland | Washington Zone 5 | N/A |
| 301-434 | Verizon Maryland | Washington Zone 3 | N/A |
| 301-435 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-436 | Verizon Maryland | Washington Zone 4 | N/A |
| 301-437 | Omnipoint Communications Cap Operations | Washington Zone 3 | N/A |
| 301-438 | Verizon Maryland | Washington Zone 12 | N/A |
| 301-439 | Verizon Maryland | Washington Zone 3 | N/A |
| 301-440 | MetroPCS | Washington Zone 5 | N/A |
| 301-441 | Verizon Maryland | Washington Zone 13 | N/A |
| 301-442 | Omnipoint Communications Cap Operations | Washington Zone 3 | N/A |
| 301-443 | Verizon Maryland | Washington Zone 11 | N/A |
| 301-444 | Verizon Maryland | Washington Zone 10 | N/A |
| 301-445 | Verizon Maryland | Washington Zone 3 | N/A |
| 301-446 | Verizon Maryland | Washington Zone 13 | N/A |
| 301-447 | Verizon Maryland | Emmitsburg | N/A |
| 301-448 | Comcast IP Phone | Washington Zone 3 | N/A |
| 301-449 | Verizon Maryland | Washington Zone 5 | N/A |
| 301-450 | New Cingular Wireless PCS | Washington Zone 3 | 7/15/2022 |
| 301-451 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-452 | Cellco Partnership | Washington Zone 3 | N/A |
| 301-453 | Verizon Maryland | Kitzmiller | N/A |
| 301-454 | Verizon Maryland | Washington Zone 4 | N/A |
| 301-455 | Omnipoint Communications Cap Operations | Washington Zone 3 | N/A |
| 301-456 | Comcast IP Phone | Washington Zone 5 | N/A |
| 301-457 | Verizon Maryland | Washington Zone 3 | N/A |
| 301-458 | Teleport Communications America | Washington Zone 4 | N/A |
| 301-459 | Verizon Maryland | Washington Zone 4 | N/A |
| 301-460 | Verizon Maryland | Washington Zone 11 | N/A |
| 301-461 | Cellco Partnership | Washington Zone 10 | N/A |
| 301-462 | MetroPCS | Myersville | N/A |
| 301-463 | Verizon Maryland | Lonaconing | N/A |
| 301-464 | Verizon Maryland | Washington Zone 14 | N/A |
| 301-465 | Omnipoint Communications Cap Operations | Myersville | N/A |
| 301-466 | Cellco Partnership | Washington Zone 3 | N/A |
| 301-467 | Cellco Partnership | Washington Zone 3 | N/A |
| 301-468 | Verizon Maryland | Washington Zone 11 | N/A |
| 301-469 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-470 | Verizon Maryland | Washington Zone 14 | N/A |
| 301-471 | Cellco Partnership | Frederick | N/A |
| 301-472 | Verizon Maryland | Mechanicsville | N/A |
| 301-473 | Verizon Maryland | Frederick | N/A |
| 301-474 | Verizon Maryland | Washington Zone 13 | N/A |
| 301-475 | Verizon Maryland | Leonardtown | N/A |
| 301-476 | Verizon Maryland | Ashton | N/A |
| 301-477 | Comcast IP Phone | Washington Zone 13 | N/A |
| 301-478 | Verizon Maryland | Flintstone | N/A |
| 301-479 | MCIMetro Access Transmission Services | Washington Zone 13 | N/A |
| 301-480 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-481 | Cellco Partnership | Leonardtown | N/A |
| 301-482 | Verizon Maryland | Damascus | N/A |
| 301-483 | Verizon Maryland | Laurel | N/A |
| 301-484 | Comcast IP Phone | Washington Zone 4 | N/A |
| 301-485 | Comcast IP Phone | Washington Zone 6 | N/A |
| 301-486 | Verizon Maryland | Washington Zone 13 | N/A |
| 301-487 | Verizon Maryland | Myersville | N/A |
| 301-488 | Verizon Maryland | Washington Zone 13 | N/A |
| 301-489 | Verizon Maryland | Washington Zone 13 | N/A |
| 301-490 | Verizon Maryland | Laurel | N/A |
| 301-491 | Uscoc Of Cumberland | Hagerstown | N/A |
| 301-492 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-493 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-494 | Verizon Maryland | Washington Zone 15 | N/A |
| 301-495 | Verizon Maryland | Washington Zone 3 | N/A |
| 301-496 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-497 | Verizon Maryland | Laurel | N/A |
| 301-498 | Verizon Maryland | Laurel | N/A |
| 301-499 | Verizon Maryland | Washington Zone 5 | N/A |
| NPANXX | Carrier1 | Area Served2 | Date3 |
|---|---|---|---|
| 301-500 | MCIMetro Access Transmission Services | Washington Zone 2 | N/A |
| 301-501 | New Cingular Wireless PCS | Oakland | N/A |
| 301-502 | Cellco Partnership | Washington Zone 3 | N/A |
| 301-503 | New Cingular Wireless PCS | Washington Zone 2 | N/A |
| 301-504 | Verizon Maryland | Washington Zone 3 | N/A |
| 301-505 | Verizon Maryland | Washington Zone 6 | N/A |
| 301-506 | USA Mobility Wireless | Washington Zone 13 | N/A |
| 301-507 | Verizon Maryland | Washington Zone 13 | N/A |
| 301-508 | New Cingular Wireless PCS | Myersville | N/A |
| 301-509 | Cellco Partnership | Washington Zone 3 | N/A |
| 301-510 | USA Mobility Wireless | Washington Zone 13 | N/A |
| 301-512 | Cellco Partnership | Washington Zone 3 | N/A |
| 301-513 | Verizon Maryland | Washington Zone 13 | N/A |
| 301-514 | Cellco Partnership | Frederick | N/A |
| 301-515 | Verizon Maryland | Gaithersburg | N/A |
| 301-516 | Verizon Maryland | Washington Zone 5 | N/A |
| 301-517 | Verizon Maryland | Washington Zone 10 | N/A |
| 301-518 | Cellco Partnership | Washington Zone 3 | N/A |
| 301-519 | Verizon Maryland | Gaithersburg | N/A |
| 301-520 | Cellco Partnership | Washington Zone 3 | N/A |
| 301-521 | Verizon Maryland | Washington Zone 6 | N/A |
| 301-522 | Verizon Maryland | Washington Zone 11 | N/A |
| 301-523 | Omnipoint Communications Cap Operations | Washington Zone 3 | N/A |
| 301-524 | Omnipoint Communications Cap Operations | Frederick | N/A |
| 301-525 | Quantum Telecommunications | Gaithersburg | 10/16/2003 |
| 301-526 | New Cingular Wireless PCS | Washington Zone 3 | N/A |
| 301-527 | Verizon Maryland | Gaithersburg | N/A |
| 301-528 | Verizon Maryland | Gaithersburg | N/A |
| 301-529 | New Cingular Wireless PCS | Washington Zone 10 | N/A |
| 301-530 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-531 | Starpower Communications | Washington Zone 4 | N/A |
| 301-532 | Omnipoint Communications Cap Operations | Laurel | 2/20/2015 |
| 301-533 | Verizon Maryland | Oakland | N/A |
| 301-534 | Ymax Communications Corp. | Indian Head | 11/15/2006 |
| 301-535 | New Cingular Wireless PCS | Waldorf | N/A |
| 301-536 | MetroPCS | Leonardtown | N/A |
| 301-537 | Omnipoint Communications Cap Operations | Washington Zone 3 | N/A |
| 301-538 | New Cingular Wireless PCS | Washington Zone 2 | N/A |
| 301-539 | Teleport Communications America | La Plata | N/A |
| 301-540 | Verizon Maryland | Gaithersburg | N/A |
| 301-541 | Teleport Communications America | Washington Zone 5 | N/A |
| 301-542 | Teleport Communications America | Waldorf | N/A |
| 301-543 | Teleport Communications America | Laurel | N/A |
| 301-544 | Verizon Maryland | Washington Zone 10 | N/A |
| 301-545 | Verizon Maryland | Washington Zone 10 | N/A |
| 301-546 | Verizon Maryland | Washington Zone 4 | 4/7/2014 |
| 301-547 | Teleport Communications America | Washington Zone 2 | N/A |
| 301-548 | Verizon Maryland | Washington Zone 10 | N/A |
| 301-549 | Verizon Maryland | Ashton | N/A |
| 301-550 | New Cingular Wireless PCS | Washington Zone 10 | 7/26/2022 |
| 301-551 | Baltimore-Washington Telephone (bwt) | Washington Zone 3 | N/A |
| 301-552 | Verizon Maryland | Washington Zone 13 | N/A |
| 301-553 | USA Mobility Wireless | Waldorf | N/A |
| 301-554 | USA Mobility Wireless | Washington Zone 2 | N/A |
| 301-556 | Teleport Communications America | Gaithersburg | N/A |
| 301-557 | Level 3 Communications | Washington Zone 3 | 9/6/2011 |
| 301-558 | Omnipoint Communications Cap Operations | Washington Zone 13 | N/A |
| 301-559 | Verizon Maryland | Washington Zone 4 | N/A |
| 301-560 | Paetec Itel | Washington Zone 4 | N/A |
| 301-561 | Baltimore-Washington Telephone (bwt) | Washington Zone 3 | N/A |
| 301-562 | Verizon Maryland | Washington Zone 3 | N/A |
| 301-563 | Verizon Maryland | Washington Zone 3 | N/A |
| 301-564 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-565 | Verizon Maryland | Washington Zone 3 | N/A |
| 301-566 | Verizon Maryland | Washington Zone 13 | N/A |
| 301-567 | Verizon Maryland | Washington Zone 6 | N/A |
| 301-568 | Verizon Maryland | Washington Zone 5 | N/A |
| 301-569 | Cellco Partnership | Gaithersburg | N/A |
| 301-570 | Verizon Maryland | Ashton | N/A |
| 301-571 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-572 | Verizon Maryland | Washington Zone 3 | N/A |
| 301-573 | MetroPCS | Hagerstown | N/A |
| 301-574 | Verizon Maryland | Washington Zone 15 | N/A |
| 301-575 | Paetec Itel | Laurel | N/A |
| 301-576 | Paetec Itel | Washington Zone 3 | N/A |
| 301-577 | Verizon Maryland | Washington Zone 4 | N/A |
| 301-578 | Verizon Maryland | Washington Zone 3 | N/A |
| 301-579 | Verizon Maryland | Brandywine | N/A |
| 301-580 | Cellco Partnership | Washington Zone 3 | N/A |
| 301-581 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-582 | Verizon Maryland | Hagerstown | N/A |
| 301-583 | Verizon Maryland | Washington Zone 4 | N/A |
| 301-584 | Baltimore-Washington Telephone (bwt) | Washington Zone 12 | N/A |
| 301-585 | Verizon Maryland | Washington Zone 3 | N/A |
| 301-586 | Verizon Maryland | Washington Zone 3 | N/A |
| 301-587 | Verizon Maryland | Washington Zone 3 | N/A |
| 301-588 | Verizon Maryland | Washington Zone 3 | N/A |
| 301-589 | Verizon Maryland | Washington Zone 3 | N/A |
| 301-590 | Verizon Maryland | Washington Zone 10 | N/A |
| 301-591 | Paetec Itel | Gaithersburg | N/A |
| 301-592 | Verizon Maryland | Washington Zone 3 | N/A |
| 301-593 | Verizon Maryland | Washington Zone 3 | N/A |
| 301-594 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-595 | Verizon Maryland | Washington Zone 13 | N/A |
| 301-596 | Verizon Maryland | Laurel | N/A |
| 301-597 | New Cingular Wireless PCS | Hancock | N/A |
| 301-598 | Verizon Maryland | Washington Zone 12 | N/A |
| 301-599 | Verizon Maryland | Washington Zone 5 | N/A |
| NPANXX | Carrier1 | Area Served2 | Date3 |
|---|---|---|---|
| 301-600 | Verizon Maryland | Frederick | 7/6/2006 |
| 301-601 | Verizon Maryland | Washington Zone 10 | N/A |
| 301-602 | Cellco Partnership | Washington Zone 3 | N/A |
| 301-603 | Verizon Maryland | Washington Zone 11 | N/A |
| 301-604 | Verizon Maryland | Laurel | N/A |
| 301-605 | Verizon Maryland | Washington Zone 10 | N/A |
| 301-606 | Cellco Partnership | Frederick | N/A |
| 301-607 | Verizon Maryland | Damascus | N/A |
| 301-608 | Verizon Maryland | Washington Zone 3 | N/A |
| 301-609 | Verizon Maryland | Waldorf | N/A |
| 301-610 | Verizon Maryland | Washington Zone 10 | N/A |
| 301-612 | Teleport Communications America | Washington Zone 14 | 10/11/2012 |
| 301-613 | Omnipoint Communications Cap Operations | Washington Zone 3 | N/A |
| 301-614 | Verizon Maryland | Washington Zone 13 | N/A |
| 301-615 | Bandwidth.com Clec | Washington Zone 13 | N/A |
| 301-616 | Uscoc Of Cumberland | Oakland | N/A |
| 301-617 | Verizon Maryland | Laurel | N/A |
| 301-618 | Verizon Maryland | Washington Zone 4 | N/A |
| 301-619 | Verizon Maryland | Frederick | N/A |
| 301-620 | Verizon Maryland | Frederick | N/A |
| 301-621 | Verizon Maryland | Washington Zone 14 | N/A |
| 301-622 | Verizon Maryland | Washington Zone 3 | N/A |
| 301-623 | Teleport Communications America | Washington Zone 13 | N/A |
| 301-624 | Verizon Maryland | Frederick | N/A |
| 301-625 | Verizon Maryland | Washington Zone 3 | N/A |
| 301-626 | Verizon Maryland | Washington Zone 3 | N/A |
| 301-627 | Verizon Maryland | Washington Zone 15 | N/A |
| 301-628 | Teleport Communications America | Washington Zone 3 | N/A |
| 301-629 | Verizon Maryland | Washington Zone 14 | N/A |
| 301-630 | Verizon Maryland | Washington Zone 6 | N/A |
| 301-631 | Verizon Maryland | Frederick | N/A |
| 301-632 | Verizon Maryland | Waldorf | N/A |
| 301-633 | New Cingular Wireless PCS | Washington Zone 2 | N/A |
| 301-634 | Teleport Communications America | Washington Zone 2 | N/A |
| 301-635 | Bandwidth.com Clec | Washington Zone 5 | 7/27/2022 |
| 301-636 | Verizon Maryland | Washington Zone 5 | N/A |
| 301-637 | Level 3 Communications | Washington Zone 10 | N/A |
| 301-638 | Verizon Maryland | Waldorf | N/A |
| 301-639 | Cellco Partnership | Frederick | N/A |
| 301-640 | Verizon Maryland | Washington Zone 10 | N/A |
| 301-641 | Cellco Partnership | Washington Zone 3 | N/A |
| 301-642 | New Cingular Wireless PCS | Washington Zone 2 | N/A |
| 301-643 | Cellco Partnership | Waldorf | N/A |
| 301-644 | Verizon Maryland | Frederick | N/A |
| 301-645 | Verizon Maryland | Waldorf | N/A |
| 301-646 | New Cingular Wireless PCS | Washington Zone 2 | N/A |
| 301-647 | American Messaging Services | Washington Zone 13 | N/A |
| 301-648 | New Cingular Wireless PCS | Washington Zone 2 | N/A |
| 301-649 | Verizon Maryland | Washington Zone 11 | N/A |
| 301-650 | Verizon Maryland | Washington Zone 3 | N/A |
| 301-651 | Cellco Partnership | Washington Zone 3 | N/A |
| 301-652 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-653 | New Cingular Wireless PCS | Waldorf | N/A |
| 301-654 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-655 | New Cingular Wireless PCS | Washington Zone 2 | N/A |
| 301-656 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-657 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-658 | Teleport Communications America | Ashton | N/A |
| 301-659 | New Cingular Wireless PCS | Waldorf | N/A |
| 301-660 | New Cingular Wireless PCS | Keedysville | 3/19/2004 |
| 301-661 | New Cingular Wireless PCS | Washington Zone 2 | N/A |
| 301-662 | Verizon Maryland | Frederick | N/A |
| 301-663 | Verizon Maryland | Frederick | N/A |
| 301-664 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-665 | Verizon Maryland | Hagerstown | N/A |
| 301-666 | Teleport Communications America | Washington Zone 14 | N/A |
| 301-667 | New Cingular Wireless PCS | Myersville | N/A |
| 301-668 | Verizon Maryland | Frederick | N/A |
| 301-669 | Verizon Maryland | Washington Zone 5 | N/A |
| 301-670 | Verizon Maryland | Washington Zone 10 | N/A |
| 301-671 | Bandwidth.com Clec | Hagerstown | N/A |
| 301-672 | Omnipoint Communications Cap Operations | Lexington Park-Great Mills | N/A |
| 301-673 | New Cingular Wireless PCS | Frederick | N/A |
| 301-674 | Omnipoint Communications Cap Operations | Washington Zone 2 | N/A |
| 301-675 | Omnipoint Communications Cap Operations | Washington Zone 3 | N/A |
| 301-676 | New Cingular Wireless PCS | Frederick | N/A |
| 301-677 | Teleport Communications America | Washington Zone 14 | N/A |
| 301-678 | Verizon Maryland | Hancock | N/A |
| 301-679 | Teleport Communications America | Washington Zone 12 | N/A |
| 301-680 | Verizon Maryland | Washington Zone 3 | N/A |
| 301-681 | Verizon Maryland | Washington Zone 3 | N/A |
| 301-682 | Verizon Maryland | Frederick | N/A |
| 301-683 | Teleport Communications America | Washington Zone 4 | N/A |
| 301-684 | Teleport Communications America | Indian Head | N/A |
| 301-685 | Teleport Communications America | Damascus | N/A |
| 301-686 | Verizon Maryland | Washington Zone 6 | N/A |
| 301-687 | Verizon Maryland | Frostburg | N/A |
| 301-688 | Verizon Maryland | Washington Zone 13 | N/A |
| 301-689 | Verizon Maryland | Frostburg | N/A |
| 301-690 | Idt America | Leonardtown | 5/23/2007 |
| 301-691 | Teleport Communications America | Poolesville | N/A |
| 301-692 | Teleport Communications America | Washington Zone 11 | N/A |
| 301-693 | Omnipoint Communications Cap Operations | Frederick | N/A |
| 301-694 | Verizon Maryland | Frederick | N/A |
| 301-695 | Verizon Maryland | Frederick | N/A |
| 301-696 | Verizon Maryland | Frederick | N/A |
| 301-697 | New Cingular Wireless PCS | Cumberland | N/A |
| 301-698 | Verizon Maryland | Frederick | N/A |
| 301-699 | Verizon Maryland | Washington Zone 4 | N/A |
| NPANXX | Carrier1 | Area Served2 | Date3 |
|---|---|---|---|
| 301-701 | Bandwidth.com Clec | Washington Zone 13 | N/A |
| 301-702 | Verizon Maryland | Washington Zone 5 | N/A |
| 301-703 | Level 3 Communications | Mount Airy | 8/29/2002 |
| 301-704 | Cellco Partnership | Washington Zone 3 | N/A |
| 301-705 | Verizon Maryland | Waldorf | N/A |
| 301-706 | Cellco Partnership | Washington Zone 3 | N/A |
| 301-707 | Uscoc Of Cumberland | Cumberland | N/A |
| 301-708 | Cellco Partnership | Laurel | N/A |
| 301-709 | Csc Wireless | Cumberland | 5/28/2019 |
| 301-710 | Level 3 Communications | Waldorf | 12/30/2005 |
| 301-712 | MCIMetro Access Transmission Services | Frederick | N/A |
| 301-713 | Verizon Maryland | Washington Zone 3 | N/A |
| 301-714 | Verizon Maryland | Hagerstown | N/A |
| 301-715 | Teleport Communications America | Washington Zone 15 | N/A |
| 301-716 | Verizon Maryland | Washington Zone 13 | N/A |
| 301-717 | Cellco Partnership | Washington Zone 3 | N/A |
| 301-718 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-719 | Teleport Communications America | Washington Zone 16 | N/A |
| 301-720 | Teleport Communications America | Brandywine | N/A |
| 301-721 | Verizon Maryland | Washington Zone 10 | N/A |
| 301-722 | Verizon Maryland | Cumberland | N/A |
| 301-723 | Verizon Maryland | Cumberland | N/A |
| 301-724 | Verizon Maryland | Cumberland | N/A |
| 301-725 | Verizon Maryland | Laurel | N/A |
| 301-726 | MCIMetro Access Transmission Services | Kitzmiller | 02/07/2023 |
| 301-727 | Baltimore-Washington Telephone (bwt) | Washington Zone 5 | N/A |
| 301-728 | Omnipoint Communications Cap Operations | Washington Zone 3 | N/A |
| 301-729 | Verizon Maryland | Cumberland | N/A |
| 301-730 | New Cingular Wireless PCS | Myersville | N/A |
| 301-731 | Verizon Maryland | Washington Zone 4 | N/A |
| 301-732 | MetroPCS | Frederick | N/A |
| 301-733 | Verizon Maryland | Hagerstown | N/A |
| 301-734 | Verizon Maryland | Washington Zone 3 | N/A |
| 301-735 | Verizon Maryland | Washington Zone 5 | N/A |
| 301-736 | Verizon Maryland | Washington Zone 5 | N/A |
| 301-737 | Verizon Maryland | Lexington Park-Great Mills | N/A |
| 301-738 | Verizon Maryland | Washington Zone 10 | N/A |
| 301-739 | Verizon Maryland | Hagerstown | N/A |
| 301-740 | Verizon Maryland | Gaithersburg | 4/22/2004 |
| 301-741 | Level 3 Communications | Laurel | N/A |
| 301-742 | New Cingular Wireless PCS | Washington Zone 2 | N/A |
| 301-743 | Verizon Maryland | Indian Head | N/A |
| 301-744 | Verizon Maryland | Indian Head | N/A |
| 301-745 | Verizon Maryland | Hagerstown | N/A |
| 301-746 | Verizon Maryland | Friendsville | N/A |
| 301-747 | Teleport Communications America | Washington Zone 6 | N/A |
| 301-748 | MetroPCS | Frederick | N/A |
| 301-749 | Verizon Maryland | Washington Zone 6 | N/A |
| 301-750 | Core Communications | Friendsville | 3/18/2004 |
| 301-751 | Cellco Partnership | Waldorf | N/A |
| 301-752 | Cellco Partnership | Waldorf | N/A |
| 301-753 | Verizon Maryland | Washington Zone 6 | N/A |
| 301-754 | Verizon Maryland | Washington Zone 3 | N/A |
| 301-755 | MCIMetro Access Transmission Services | Washington Zone 3 | N/A |
| 301-756 | Level 3 Telecom Of Maryland | Washington Zone 14 | N/A |
| 301-757 | Verizon Maryland | Lexington Park-Great Mills | N/A |
| 301-758 | Cellco Partnership | Washington Zone 3 | N/A |
| 301-759 | Verizon Maryland | Cumberland | N/A |
| 301-760 | Level 3 Communications | Washington Zone 2 | 2/27/2002 |
| 301-761 | Level 3 Communications | Washington Zone 11 | 2/27/2002 |
| 301-762 | Verizon Maryland | Washington Zone 10 | N/A |
| 301-763 | Verizon Maryland | Washington Zone 5 | N/A |
| 301-764 | Verizon Maryland | Waldorf | N/A |
| 301-765 | Verizon Maryland | Washington Zone 10 | N/A |
| 301-766 | Verizon Maryland | Hagerstown | N/A |
| 301-767 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-768 | Level 3 Communications | Washington Zone 3 | 2/27/2002 |
| 301-769 | Verizon Maryland | Leonardtown | N/A |
| 301-770 | Verizon Maryland | Washington Zone 11 | N/A |
| 301-771 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-772 | Verizon Maryland | Washington Zone 4 | N/A |
| 301-773 | Verizon Maryland | Washington Zone 4 | N/A |
| 301-774 | Verizon Maryland | Ashton | N/A |
| 301-775 | Cellco Partnership | Washington Zone 3 | N/A |
| 301-776 | Verizon Maryland | Laurel | N/A |
| 301-777 | Verizon Maryland | Cumberland | N/A |
| 301-778 | MCIMetro Access Transmission Services | Washington Zone 5 | N/A |
| 301-779 | Verizon Maryland | Washington Zone 4 | N/A |
| 301-780 | Verizon Maryland | Washington Zone 15 | N/A |
| 301-781 | Onvoy Spectrum | Frostburg | N/A |
| 301-782 | Verizon Maryland | Brandywine | N/A |
| 301-783 | Bandwidth.com Clec | Cumberland | N/A |
| 301-784 | Verizon Maryland | Cumberland | N/A |
| 301-785 | Cellco Partnership | Washington Zone 3 | N/A |
| 301-786 | Verizon Maryland | Mccoole | N/A |
| 301-787 | Cellco Partnership | Washington Zone 3 | N/A |
| 301-788 | Cellco Partnership | Frederick | N/A |
| 301-789 | Core Communications | Washington Zone 4 | 8/13/2002 |
| 301-790 | Verizon Maryland | Hagerstown | N/A |
| 301-791 | Verizon Maryland | Hagerstown | N/A |
| 301-792 | Omnipoint Communications Cap Operations | Washington Zone 3 | N/A |
| 301-793 | Omnipoint Communications Cap Operations | Washington Zone 3 | N/A |
| 301-794 | Verizon Maryland | Washington Zone 14 | N/A |
| 301-795 | MCIMetro Access Transmission Services | Washington Zone 10 | N/A |
| 301-796 | Verizon Maryland | Washington Zone 13 | 6/30/2003 |
| 301-797 | Verizon Maryland | Hagerstown | N/A |
| 301-798 | Verizon Maryland | Damascus | N/A |
| 301-799 | Core Communications | Keedysville | 3/18/2004 |
| NPANXX | Carrier1 | Area Served2 | Date3 |
|---|---|---|---|
| 301-800 | Omnipoint Communications Cap Operations | Hagerstown | N/A |
| 301-801 | Cellco Partnership | Washington Zone 3 | N/A |
| 301-802 | Cellco Partnership | Washington Zone 3 | N/A |
| 301-803 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-804 | MCIMetro Access Transmission Services | Ashton | N/A |
| 301-805 | Verizon Maryland | Washington Zone 14 | N/A |
| 301-806 | Omnipoint Communications Cap Operations | Washington Zone 3 | N/A |
| 301-807 | Cellco Partnership | Washington Zone 3 | N/A |
| 301-808 | Verizon Maryland | Washington Zone 5 | N/A |
| 301-809 | Verizon Maryland | Washington Zone 14 | N/A |
| 301-810 | Onvoy Spectrum | Buckeyestown | N/A |
| 301-812 | Verizon Maryland | Washington Zone 15 | N/A |
| 301-813 | Baltimore-Washington Telephone (bwt) | Washington Zone 2 | N/A |
| 301-814 | New Cingular Wireless PCS | Washington Zone 2 | N/A |
| 301-815 | Verizon Maryland | Frederick | N/A |
| 301-816 | Verizon Maryland | Washington Zone 11 | N/A |
| 301-817 | Verizon Maryland | Washington Zone 5 | N/A |
| 301-818 | Bandwidth.com Clec | Waldorf | N/A |
| 301-819 | Verizon Maryland | Washington Zone 3 | N/A |
| 301-820 | Teleport Communications America | Gaithersburg | N/A |
| 301-821 | Teleport Communications America | Laurel | N/A |
| 301-822 | MCIMetro Access Transmission Services | Washington Zone 11 | N/A |
| 301-823 | Teleport Communications America | Washington Zone 13 | N/A |
| 301-824 | Verizon Maryland | Smithsburg | N/A |
| 301-825 | AT&T | Washington Zone 10 | N/A |
| 301-826 | Verizon Maryland | Lexington Park-Great Mills | N/A |
| 301-827 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-828 | Teleport Communications America | Washington Zone 2 | N/A |
| 301-829 | Verizon Maryland | Mount Airy | N/A |
| 301-830 | Teleport Communications America | Washington Zone 3 | N/A |
| 301-831 | Verizon Maryland | Damascus | N/A |
| 301-832 | Teleport Communications America | Washington Zone 4 | N/A |
| 301-833 | Teleport Communications America | Washington Zone 14 | N/A |
| 301-834 | Verizon Maryland | Brunswick | N/A |
| 301-835 | Vonage America | Frederick | 11/27/2018 |
| 301-836 | Verizon Maryland | Washington Zone 5 | N/A |
| 301-837 | MCIMetro Access Transmission Services | Washington Zone 13 | N/A |
| 301-838 | Verizon Maryland | Washington Zone 10 | N/A |
| 301-839 | Verizon Maryland | Washington Zone 6 | N/A |
| 301-840 | Verizon Maryland | Washington Zone 10 | N/A |
| 301-841 | MCIMetro Access Transmission Services | Washington Zone 2 | N/A |
| 301-842 | Verizon Maryland | Clear Spg | N/A |
| 301-843 | Verizon Maryland | Washington Zone 6 | N/A |
| 301-844 | Omnipoint Communications Cap Operations | Washington Zone 3 | 10/4/2011 |
| 301-845 | Verizon Maryland | Walkersville | N/A |
| 301-846 | Verizon Maryland | Frederick | N/A |
| 301-847 | Verizon Maryland | Washington Zone 12 | N/A |
| 301-848 | Cellco Partnership | Waldorf | N/A |
| 301-849 | Bandwidth.com Clec | Oakland | N/A |
| 301-850 | Level 3 Communications | Washington Zone 14 | N/A |
| 301-851 | Verizon Maryland | Washington Zone 4 | N/A |
| 301-852 | Verizon Maryland | Washington Zone 4 | N/A |
| 301-853 | Verizon Maryland | Washington Zone 4 | N/A |
| 301-854 | Verizon Maryland | Ashton | N/A |
| 301-855 | Verizon Maryland | Washington Zone 15 | N/A |
| 301-856 | Verizon Maryland | Washington Zone 16 | N/A |
| 301-857 | Core Communications | Clear Spg | 7/12/2002 |
| 301-858 | Verizon Maryland | Washington Zone 14 | N/A |
| 301-859 | Level 3 Communications | Oakland | 1/9/2002 |
| 301-860 | Verizon Maryland | Washington Zone 14 | N/A |
| 301-861 | Level 3 Communications | Waldorf | N/A |
| 301-862 | Verizon Maryland | Lexington Park-Great Mills | N/A |
| 301-863 | Verizon Maryland | Lexington Park-Great Mills | N/A |
| 301-864 | Verizon Maryland | Washington Zone 4 | N/A |
| 301-865 | Verizon Maryland | New Market | N/A |
| 301-866 | Verizon Maryland | Lexington Park-Great Mills | N/A |
| 301-867 | MCIMetro Access Transmission Services | Washington Zone 14 | N/A |
| 301-868 | Verizon Maryland | Washington Zone 16 | N/A |
| 301-869 | Verizon Maryland | Gaithersburg | N/A |
| 301-870 | Verizon Maryland | Washington Zone 6 | N/A |
| 301-871 | Verizon Maryland | Washington Zone 11 | N/A |
| 301-872 | Verizon Maryland | Ridge | N/A |
| 301-873 | Cellco Partnership | Washington Zone 3 | N/A |
| 301-874 | Verizon Maryland | Buckeyestown | N/A |
| 301-875 | Cellco Partnership | Laurel | N/A |
| 301-876 | Level 3 Communications | Cumberland | 5/2/2002 |
| 301-877 | Verizon Maryland | Washington Zone 16 | N/A |
| 301-878 | MCIMetro Access Transmission Services | Baltimore | N/A |
| 301-879 | Verizon Maryland | Washington Zone 12 | N/A |
| 301-880 | Level 3 Communications | Lexington Park-Great Mills | N/A |
| 301-881 | Verizon Maryland | Washington Zone 11 | N/A |
| 301-882 | Core Communications | New Market | 3/18/2004 |
| 301-883 | Verizon Maryland | Washington Zone 5 | N/A |
| 301-884 | Verizon Maryland | Mechanicsville | N/A |
| 301-885 | Verizon Maryland | Waldorf | N/A |
| 301-886 | Bandwidth.com Clec | Washington Zone 13 | N/A |
| 301-887 | Verizon Maryland | Washington Zone 4 | N/A |
| 301-888 | Verizon Maryland | Washington Zone 16 | N/A |
| 301-889 | Verizon Maryland | Washington Zone 14 | N/A |
| 301-890 | Verizon Maryland | Washington Zone 12 | N/A |
| 301-891 | Verizon Maryland | Washington Zone 3 | N/A |
| 301-892 | Verizon Maryland | Washington Zone 4 | 3/11/2005 |
| 301-893 | Verizon Maryland | Washington Zone 6 | N/A |
| 301-894 | Verizon Maryland | Washington Zone 6 | N/A |
| 301-895 | Verizon Maryland | Grantsville | N/A |
| 301-896 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-897 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-898 | Verizon Maryland | Frederick | N/A |
| 301-899 | Verizon Maryland | Washington Zone 5 | N/A |
| NPANXX | Carrier1 | Area Served2 | Date3 |
|---|---|---|---|
| 301-900 | Onvoy | Washington Zone 2 | 2/18/2015 |
| 301-901 | Verizon Maryland | Washington Zone 13 | N/A |
| 301-902 | Verizon Maryland | Washington Zone 13 | N/A |
| 301-903 | Verizon Maryland | Washington Zone 10 | N/A |
| 301-904 | Cellco Partnership | Leonardtown | N/A |
| 301-905 | Verizon Maryland | Washington Zone 3 | N/A |
| 301-906 | New Cingular Wireless PCS | Washington Zone 2 | N/A |
| 301-907 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-908 | Cellco Partnership | Washington Zone 3 | N/A |
| 301-909 | MCIMetro Access Transmission Services | Washington Zone 5 | N/A |
| 301-910 | New Cingular Wireless PCS | Washington Zone 2 | N/A |
| 301-912 | Verizon Maryland | Washington Zone 14 | N/A |
| 301-913 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-914 | Mountain Communications | Oakland | 12/27/2012 |
| 301-915 | Starpower Communications | Washington Zone 2 | N/A |
| 301-916 | Verizon Maryland | Gaithersburg | N/A |
| 301-917 | Starpower Communications | Washington Zone 10 | N/A |
| 301-918 | Verizon Maryland | Washington Zone 4 | N/A |
| 301-919 | New Cingular Wireless PCS | Washington Zone 2 | N/A |
| 301-920 | Starpower Communications | Washington Zone 3 | N/A |
| 301-921 | Verizon Maryland | Washington Zone 10 | N/A |
| 301-922 | Cellco Partnership | Washington Zone 3 | N/A |
| 301-923 | Bandwidth.com Clec | Washington Zone 13 | N/A |
| 301-924 | Verizon Maryland | Washington Zone 12 | N/A |
| 301-925 | Verizon Maryland | Washington Zone 5 | N/A |
| 301-926 | Verizon Maryland | Gaithersburg | N/A |
| 301-927 | Verizon Maryland | Washington Zone 4 | N/A |
| 301-928 | Cellco Partnership | Washington Zone 3 | N/A |
| 301-929 | Verizon Maryland | Washington Zone 11 | N/A |
| 301-930 | Verizon Maryland | Washington Zone 3 | N/A |
| 301-931 | Verizon Maryland | Washington Zone 13 | N/A |
| 301-932 | Verizon Maryland | Waldorf | N/A |
| 301-933 | Verizon Maryland | Washington Zone 11 | N/A |
| 301-934 | Verizon Maryland | La Plata | N/A |
| 301-935 | Verizon Maryland | Washington Zone 13 | N/A |
| 301-936 | Telnyx | Hagerstown | 6/2/2017 |
| 301-937 | Verizon Maryland | Washington Zone 13 | N/A |
| 301-938 | Cellco Partnership | Washington Zone 3 | N/A |
| 301-939 | Verizon Maryland | Washington Zone 13 | N/A |
| 301-940 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-941 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-942 | Verizon Maryland | Washington Zone 11 | N/A |
| 301-943 | Cellco Partnership | Washington Zone 3 | N/A |
| 301-944 | MCIMetro Access Transmission Services | Gaithersburg | N/A |
| 301-945 | MCIMetro Access Transmission Services | Washington Zone 11 | N/A |
| 301-946 | Verizon Maryland | Washington Zone 11 | N/A |
| 301-947 | Verizon Maryland | Gaithersburg | N/A |
| 301-948 | Verizon Maryland | Washington Zone 10 | N/A |
| 301-949 | Verizon Maryland | Washington Zone 11 | N/A |
| 301-951 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-952 | Verizon Maryland | Washington Zone 15 | N/A |
| 301-953 | Verizon Maryland | Washington Zone 13 | N/A |
| 301-955 | MCIMetro Access Transmission Services | Washington Zone 4 | N/A |
| 301-956 | Verizon Maryland | Gaithersburg | 5/22/2002 |
| 301-957 | MCIMetro Access Transmission Services | Laurel | N/A |
| 301-960 | MCIMetro Access Transmission Services | Washington Zone 3 | N/A |
| 301-961 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-962 | Verizon Maryland | Washington Zone 11 | N/A |
| 301-963 | Verizon Maryland | Gaithersburg | N/A |
| 301-964 | New Cingular Wireless PCS | Myersville | N/A |
| 301-965 | MCIMetro Access Transmission Services | Washington Zone 6 | N/A |
| 301-966 | MCIMetro Access Transmission Services | Washington Zone 12 | N/A |
| 301-967 | Verizon Maryland | Washington Zone 5 | N/A |
| 301-968 | MCIMetro Access Transmission Services | Washington Zone 2 | N/A |
| 301-969 | Comcast IP Phone | Brunswick | 3/6/2007 |
| 301-970 | Verizon Maryland | Washington Zone 14 | N/A |
| 301-971 | Starpower Communications | Washington Zone 6 | N/A |
| 301-972 | Verizon Maryland | Gaithersburg | N/A |
| 301-973 | Bandwidth.com Clec | Washington Zone 14 | N/A |
| 301-974 | Starpower Communications | Laurel | N/A |
| 301-975 | Verizon Maryland | Washington Zone 10 | N/A |
| 301-977 | Verizon Maryland | Gaithersburg | N/A |
| 301-978 | Verizon Maryland | Washington Zone 10 | N/A |
| 301-979 | Omnipoint Communications Cap Operations | Washington Zone 10 | N/A |
| 301-980 | Cellco Partnership | Washington Zone 3 | N/A |
| 301-981 | Level 3 Telecom Of Maryland | Washington Zone 5 | N/A |
| 301-982 | Verizon Maryland | Washington Zone 13 | N/A |
| 301-983 | Verizon Maryland | Washington Zone 10 | N/A |
| 301-984 | Verizon Maryland | Washington Zone 11 | N/A |
| 301-985 | Verizon Maryland | Washington Zone 4 | N/A |
| 301-986 | Verizon Maryland | Washington Zone 2 | N/A |
| 301-987 | Verizon Maryland | Gaithersburg | N/A |
| 301-988 | Uscoc Of Cumberland | Hagerstown | N/A |
| 301-989 | Verizon Maryland | Washington Zone 12 | N/A |
| 301-990 | Verizon Maryland | Gaithersburg | N/A |
| 301-991 | Omnipoint Communications Cap Operations | Hagerstown | N/A |
| 301-992 | MetroPCS | Hagerstown | N/A |
| 301-993 | Verizon Maryland | Washington Zone 13 | N/A |
| 301-994 | Verizon Maryland | Lexington Park-Great Mills | N/A |
| 301-995 | Verizon Maryland | Lexington Park-Great Mills | N/A |
| 301-996 | Omnipoint Communications Cap Operations | Washington Zone 3 | N/A |
| 301-997 | Verizon Maryland | Leonardtown | N/A |
| 301-998 | Verizon Maryland | Washington Zone 11 | N/A |
- NPA-NXX assigned carrier; with Number Pooling thousand block numbers are often assigned to other carriers as well; moreover, phone numbers can be ported between service providers
- For 'Area served' we list the rate center. In the North American Numbering Plan a rate center is a geographic area used to determine local calling boundaries for billing purposes. Its name is generally a locality, often not the only one served by an NPA-NXX combination.
- Assignment date. N/A - mostly central office codes assigned before 2001.
- NXX prefixes last updated: November 22, 2025
Cities in area code 301
| City1 | County | Time Zone1 |
|---|---|---|
| Abell | St Marys | E |
| Accident | Garrett | E |
| Accokeek | Prince George's | E |
| Adamstown | Frederick | E |
| Andrews Afb | Prince George's | E |
| Aquasco | Prince George's | E |
| Ashton | Montgomery | E |
| Avenue | St Marys | E |
| Barnesville | Montgomery | E |
| Barton | Allegany | E |
| Beallsville | Montgomery | E |
| Bel Alton | Charles | E |
| Beltsville | Prince George's | E |
| Benedict | Charles | E |
| Bethesda | Montgomery | E |
| Big Pool | Washington | E |
| Bittinger | Garrett | E |
| Bladensburg | Prince George's | E |
| Bloomington | Garrett | E |
| Boonsboro | Washington | E |
| Bowie | Prince George's | E |
| Boyds | Montgomery | E |
| Braddock Heights | Frederick | E |
| Brandywine | Prince George's | E |
| Brentwood | Prince George's | E |
| Brinklow | Montgomery | E |
| Brookeville | Montgomery | E |
| Brownsville | Washington | E |
| Brunswick | Frederick | E |
| Bryans Road | Charles | E |
| Bryantown | Charles | E |
| Buckeystown | Frederick | E |
| Burkittsville | Frederick | E |
| Burtonsville | Montgomery | E |
| Bushwood | St Marys | E |
| Cabin John | Montgomery | E |
| California | St Marys | E |
| Callaway | St Marys | E |
| Capitol Heights | Prince George's | E |
| Cascade | Washington | E |
| Cavetown | Washington | E |
| Chaptico | St Marys | E |
| Charlotte Hall | St Marys | E |
| Cheltenham | Prince George's | E |
| Chevy Chase | Montgomery | E |
| Chewsville | Washington | E |
| Clarksburg | Montgomery | E |
| Clear Spring | Washington | E |
| Clements | St Marys | E |
| Clinton | Prince George's | E |
| Cobb Island | Charles | E |
| College Park | Prince George's | E |
| Coltons Point | St Marys | E |
| Compton | St Marys | E |
| Corriganville | Allegany | E |
| Cumberland | Allegany | E |
| Damascus | Montgomery | E |
| Dameron | St Marys | E |
| Derwood | Montgomery | E |
| Dickerson | Montgomery | E |
| District Heights | Prince George's | E |
| Drayden | St Marys | E |
| Eckhart Mines | Allegany | E |
| Ellerslie | Allegany | E |
| Emmitsburg | Frederick | E |
| Fairplay | Washington | E |
| Faulkner | Charles | E |
| Flintstone | Allegany | E |
| Fort Washington | Prince George's | E |
| Frederick | Frederick | E |
| Friendship | Anne Arundel | E |
| Friendsville | Garrett | E |
| Frostburg | Allegany | E |
| Funkstown | Washington | E |
| Gaithersburg | Montgomery | E |
| Garrett Park | Montgomery | E |
| Germantown | Montgomery | E |
| Glen Echo | Montgomery | E |
| Glenn Dale | Prince George's | E |
| Grantsville | Garrett | E |
| Great Mills | St Marys | E |
| Greenbelt | Prince George's | E |
| Hagerstown | Washington | E |
| Hancock | Washington | E |
| Helen | St Marys | E |
| Highland | Howard | E |
| Hollywood | St Marys | E |
| Hughesville | Charles | E |
| Hyattsville | Prince George's | E |
| Ijamsville | Frederick | E |
| Indian Head | Charles | E |
| Ironsides | Charles | E |
| Issue | Charles | E |
| Jefferson | Frederick | E |
| Keedysville | Washington | E |
| Kensington | Montgomery | E |
| Kitzmiller | Garrett | E |
| Knoxville | Frederick | E |
| La Plata | Charles | E |
| Ladiesburg | Frederick | E |
| Lanham | Prince George's | E |
| Laurel | Anne Arundel | E |
| Leonardtown | St Marys | E |
| Lexington Park | St Marys | E |
| Libertytown | Frederick | E |
| Little Orleans | Allegany | E |
| Lonaconing | Allegany | E |
| Loveville | St Marys | E |
| Luke | Allegany | E |
| Marbury | Charles | E |
| Maugansville | Washington | E |
| Mc Henry | Garrett | E |
| Mechanicsville | St Marys | E |
| Middletown | Frederick | E |
| Midland | Allegany | E |
| Midlothian | Allegany | E |
| Monrovia | Frederick | E |
| Montgomery Village | Montgomery | E |
| Morganza | St Marys | E |
| Mount Airy | Frederick | E |
| Mount Rainier | Prince George's | E |
| Mount Savage | Allegany | E |
| Mount Victoria | Charles | E |
| Myersville | Frederick | E |
| Nanjemoy | Charles | E |
| National Harbor | Prince George's | E |
| New Market | Frederick | E |
| New Midway | Frederick | E |
| Newburg | Charles | E |
| Oakland | Garrett | E |
| Oldtown | Allegany | E |
| Olney | Montgomery | E |
| Owings | Calvert | E |
| Oxon Hill | Prince George's | E |
| Park Hall | St Marys | E |
| Patuxent River | St Marys | E |
| Piney Point | St Marys | E |
| Pinto | Allegany | E |
| Point Of Rocks | Frederick | E |
| Pomfret | Charles | E |
| Poolesville | Montgomery | E |
| Port Tobacco | Charles | E |
| Potomac | Montgomery | E |
| Rawlings | Allegany | E |
| Ridge | St Marys | E |
| Riverdale | Prince George's | E |
| Rock Point | Charles | E |
| Rockville | Montgomery | E |
| Rocky Ridge | Frederick | E |
| Rohrersville | Washington | E |
| Sabillasville | Frederick | E |
| Sandy Spring | Montgomery | E |
| Scotland | St Marys | E |
| Sharpsburg | Washington | E |
| Silver Spring | Montgomery | E |
| Smithsburg | Washington | E |
| Southern MD Facility | Prince George's | E |
| Spencerville | Montgomery | E |
| Spring Gap | Allegany | E |
| St Inigoes | St Marys | E |
| St James | Washington | E |
| St Marys City | St Marys | E |
| Suburb Maryland Fac | Montgomery | E |
| Suitland | Prince George's | E |
| Swanton | Garrett | E |
| Takoma Park | Montgomery | E |
| Tall Timbers | St Marys | E |
| Temple Hills | Prince George's | E |
| Thurmont | Frederick | E |
| Tuscarora | Frederick | E |
| Unionville | Frederick | E |
| Upper Marlboro | Prince George's | E |
| Valley Lee | St Marys | E |
| Waldorf | Charles | E |
| Walkersville | Frederick | E |
| Washington Grove | Montgomery | E |
| Welcome | Charles | E |
| Westernport | Allegany | E |
| White Plains | Charles | E |
| Williamsport | Washington | E |
| Woodsboro | Frederick | E |
- Listed above are most places served by USA area code 301. When multiple places in a US state share the same name we list the largest one only. Cities with population over 50,000 are displayed in bold text.
- E stands for Eastern Time (currently ).
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