| Prefixes | City | County | Line Type | Company |
|---|---|---|---|---|
| 301-121 | Bethesda | Montgomery | Unknown | |
| 301-122 | Bethesda | Montgomery | Unknown | |
| 301-123 | Bethesda | Montgomery | Unknown | |
| 301-200 | Pelahatchie | Rankin | Landline | Bandwidth.com Clec, Llc Md |
| 301-203 | Fort Washington | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-204 | District Heights | Prince Georges | Cell Phone | New Cingular Wireless Pcs,... |
| 301-205 | Edgewater | Anne Arundel | Landline | Verizon Maryland, Inc. |
| 301-206 | Laurel | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-207 | Savage | Howard | Cell Phone | Usa Mobility Wireless, Inc. |
| 301-208 | Gaithersburg | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-209 | Hyattsville | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-210 | Beltsville | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-212 | Gaithersburg | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-213 | Washington | District Of Columbia | Cell Phone | Sprint Spectrum L.p. |
| 301-214 | Bethesda | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-215 | Bethesda | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-216 | Gaithersburg | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-217 | Rockville | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-218 | Bowie | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-219 | Rockville | Montgomery | Cell Phone | New Cingular Wireless Pcs,... |
| 301-220 | Greenbelt | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-221 | Bethesda | Montgomery | Cell Phone | New Cingular Wireless Pcs,... |
| 301-222 | Bethesda | Montgomery | Landline | Cavalier Telephone Midatla... |
| 301-223 | Williamsport | Washington | Landline | Verizon Maryland, Inc. |
| 301-225 | Baltimore | Baltimore City | Landline | Teleport Communications Gro... |
| 301-226 | College Park | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-227 | Bethesda | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-228 | Frederick | Frederick | Landline | Verizon Maryland, Inc. |
| 301-229 | Bethesda | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-230 | Rockville | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-231 | Rockville | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-232 | Kensington | Montgomery | Landline | Mcimetro Access Transmissio... |
| 301-233 | Rockville | Montgomery | Cell Phone | Cellco Partnership Dba Veri... |
| 301-234 | Clinton | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-235 | Olney | Montgomery | Landline | Mcimetro Access Transmissio... |
| 301-236 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-237 | Bowie | Prince Georges | Cell Phone | Sprint Spectrum L.p. |
| 301-238 | Suitland | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-239 | Cumberland | Allegany | Landline | Verizon Maryland, Inc. |
| 301-240 | Gaithersburg | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-241 | Cascade | Washington | Landline | Verizon Maryland, Inc. |
| 301-242 | Silver Spring | Montgomery | Landline | Mcimetro Access Transmissio... |
| 301-243 | Gaithersburg | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-244 | Silver Spring | Montgomery | Landline | Telcove Operations, Inc. Md |
| 301-245 | Grantsville | Garrett | Landline | Verizon Maryland, Inc. |
| 301-246 | Nanjemoy | Charles | Landline | Verizon Maryland, Inc. |
| 301-247 | Laurel | Anne Arundel | Cell Phone | New Cingular Wireless Pcs,... |
| 301-248 | Fort Washington | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-249 | Bowie | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-250 | Gaithersburg | Montgomery | Landline | Mcimetro Access Transmissio... |
| 301-251 | Rockville | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-252 | Silver Spring | Montgomery | Cell Phone | Nextel Communications, Inc. |
| 301-253 | Damascus | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-254 | Silver Spring | Montgomery | Cell Phone | Sprint Spectrum L.p. |
| 301-255 | Rockville | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-256 | Hyattsville | Prince Georges | Landline | Mcimetro Access Transmissio... |
| 301-257 | Silver Spring | Montgomery | Cell Phone | Sprint Spectrum L.p. |
| 301-258 | Gaithersburg | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-259 | Newburg | Charles | Landline | Verizon Maryland, Inc. |
| 301-260 | Olney | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-261 | Crofton | Anne Arundel | Landline | Verizon Maryland, Inc. |
| 301-262 | Bowie | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-263 | Bethesda | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-264 | Mount Savage | Allegany | Landline | Verizon Maryland, Inc. |
| 301-265 | Fort Washington | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-266 | Waldorf | Charles | Cell Phone | New Cingular Wireless Pcs,... |
| 301-267 | Savage | Howard | Cell Phone | Usa Mobility Wireless, Inc. |
| 301-268 | Cumberland | Allegany | Landline | Uscoc Of Cumberland, Inc. D... |
| 301-270 | Takoma Park | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-271 | Thurmont | Frederick | Landline | Verizon Maryland, Inc. |
| 301-272 | Bethesda | Montgomery | Landline | Mcimetro Access Transmissio... |
| 301-273 | Silver Spring | Montgomery | Landline | Mcimetro Access Transmissio... |
| 301-274 | Hughesville | Charles | Landline | Verizon Maryland, Inc. |
| 301-275 | Rockville | Montgomery | Cell Phone | New Cingular Wireless Pcs,... |
| 301-276 | Hyattsville | Prince Georges | Landline | Mcimetro Access Transmissio... |
| 301-277 | Hyattsville | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-278 | Suitland | Prince Georges | Landline | Mcimetro Access Transmissio... |
| 301-279 | Rockville | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-280 | Bethesda | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-281 | Washington | District Of Columbia | Landline | Mcimetro Access Transmissio... |
| 301-282 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-283 | Accokeek | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-284 | Bethesda | Montgomery | Landline | Mcimetro Access Transmissio... |
| 301-285 | Capitol Heights | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-286 | Greenbelt | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-287 | Rockville | Montgomery | Landline | Mcimetro Access Transmissio... |
| 301-288 | Silver Spring | Montgomery | Landline | Mcimetro Access Transmissio... |
| 301-289 | Beltsville | Prince Georges | Landline | Mcimetro Access Transmissio... |
| 301-290 | Mechanicsville | Saint Marys | Landline | Verizon Maryland, Inc. |
| 301-291 | Annapolis | Anne Arundel | Landline | Mcimetro Access Transmissio... |
| 301-292 | Fort Washington | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-293 | Myersville | Frederick | Landline | Verizon Maryland, Inc. |
| 301-294 | Rockville | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-295 | Bethesda | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-296 | Rockville | Montgomery | Landline | Mci Worldcom Communications... |
| 301-297 | Clinton | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-298 | Bethesda | Montgomery | Landline | Mcimetro Access Transmissio... |
| 301-299 | Potomac | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-300 | Ashton | Montgomery | Cell Phone | Cellco Partnership Dba Veri... |
| 301-301 | Madison | Dane | Landline | Unknown |
| 301-302 | Hagerstown | Washington | Landline | Nationsline, Inc. Md |
| 301-304 | Walkersville | Frederick | Landline | Comcast Phone Of Northern M... |
| 301-305 | Herndon | Fairfax | Cell Phone | Sprint Spectrum L.p. |
| 301-306 | Lanham | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-307 | Columbia | Howard | Landline | Verizon Maryland, Inc. |
| 301-309 | Rockville | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-310 | Columbia | Howard | Landline | Verizon Maryland, Inc. |
| 301-312 | Bethesda | Montgomery | Cell Phone | New Cingular Wireless Pcs,... |
| 301-313 | Greenbelt | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-314 | College Park | Prince Georges | Landline | Paetec Communications, Inc.... |
| 301-315 | Rockville | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-316 | Temple Hills | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-317 | Laurel | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-318 | Rockville | Montgomery | Cell Phone | New Cingular Wireless Pcs,... |
| 301-319 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-320 | Bethesda | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-321 | Oakland | Garrett | Landline | Telcove Operations, Inc. Md |
| 301-322 | Hyattsville | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-323 | Laurel | Prince Georges | Landline | Tw Telecom Of Maryland Llc... |
| 301-324 | Upper Marlboro | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-325 | Silver Spring | Montgomery | Cell Phone | Cellco Partnership Dba Veri... |
| 301-326 | Silver Spring | Montgomery | Cell Phone | Omnipoint Communications Ca... |
| 301-327 | Dunkirk | Calvert | Landline | Nationsline, Inc. Md |
| 301-328 | Silver Spring | Montgomery | Landline | Comcast Phone Of Northern M... |
| 301-329 | Cumberland | Allegany | Cell Phone | Usa Mobility Wireless, Inc. |
| 301-330 | Gaithersburg | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-331 | Hagerstown | Washington | Cell Phone | New Cingular Wireless Pcs,... |
| 301-332 | Silver Spring | Montgomery | Cell Phone | New Cingular Wireless Pcs,... |
| 301-333 | Upper Marlboro | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-334 | Oakland | Garrett | Landline | Verizon Maryland, Inc. |
| 301-335 | Upper Marlboro | Prince Georges | Cell Phone | New Cingular Wireless Pcs,... |
| 301-336 | Capitol Heights | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-337 | Gaithersburg | Montgomery | Landline | Mci Worldcom Communications... |
| 301-338 | Cumberland | Allegany | Landline | Idt America Corp Md |
| 301-339 | Bowie | Prince Georges | Landline | Cavalier Telephone Midatla... |
| 301-340 | Rockville | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-341 | Hyattsville | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-342 | Patuxent River | Saint Marys | Landline | Verizon Maryland, Inc. |
| 301-343 | Upper Marlboro | Prince Georges | Cell Phone | Nextel Communications, Inc. |
| 301-344 | Greenbelt | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-345 | Greenbelt | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-346 | Upper Marlboro | Prince Georges | Cell Phone | New Cingular Wireless Pcs,... |
| 301-347 | Bethesda | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-348 | Rockville | Montgomery | Landline | Mci Worldcom Communications... |
| 301-349 | Poolesville | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-350 | Capitol Heights | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-351 | Germantown | Montgomery | Cell Phone | Cellco Partnership Dba Veri... |
| 301-352 | Bowie | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-353 | Germantown | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-354 | Rockville | Montgomery | Landline | Teleport Communications Gro... |
| 301-355 | Gaithersburg | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-356 | Temple Hills | Prince Georges | Landline | Vdl, Inc. Dba Global Teleco... |
| 301-357 | Upper Marlboro | Prince Georges | Cell Phone | Cellco Partnership Dba Veri... |
| 301-358 | Upper Marlboro | Prince Georges | Landline | Level 3 Communications, Llc... |
| 301-359 | Westernport | Allegany | Landline | Verizon Maryland, Inc. |
| 301-360 | Frederick | Frederick | Landline | Verizon Maryland, Inc. |
| 301-361 | Laurel | Prince Georges | Landline | Tw Telecom Of Maryland Llc... |
| 301-362 | Laurel | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-363 | Frederick | Frederick | Landline | Level 3 Communications, Llc... |
| 301-364 | Fort Washington | Prince Georges | Landline | Mci Worldcom Communications... |
| 301-365 | Bethesda | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-366 | Silver Spring | Montgomery | Cell Phone | Nextel Communications, Inc. |
| 301-367 | Gaithersburg | Montgomery | Cell Phone | Cellco Partnership Dba Veri... |
| 301-368 | Damascus | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-369 | Laurel | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-370 | Gaithersburg | Montgomery | Cell Phone | Nextel Communications, Inc. |
| 301-371 | Middletown | Frederick | Landline | Verizon Maryland, Inc. |
| 301-372 | Brandywine | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-373 | Hollywood | Saint Marys | Landline | Verizon Maryland, Inc. |
| 301-374 | Waldorf | Charles | Landline | Verizon Maryland, Inc. |
| 301-375 | Bryans Road | Charles | Landline | Verizon Maryland, Inc. |
| 301-376 | New Market | Frederick | Landline | Verizon Maryland, Inc. |
| 301-377 | Laurel | Prince Georges | Landline | Comcast Phone Of Northern M... |
| 301-378 | Frederick | Frederick | Landline | Comcast Phone Of Northern M... |
| 301-379 | Silver Spring | Montgomery | Cell Phone | Sprint Spectrum L.p. |
| 301-380 | Bethesda | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-382 | Riverdale | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-383 | Lanham | Prince Georges | Landline | Comcast Phone Of Northern M... |
| 301-384 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-385 | Waldorf | Charles | Cell Phone | New Cingular Wireless Pcs,... |
| 301-386 | Hyattsville | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-387 | Oakland | Garrett | Landline | Verizon Maryland, Inc. |
| 301-388 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-389 | Lanham | Prince Georges | Landline | Tw Telecom Of Maryland Llc... |
| 301-390 | Bowie | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-391 | Damascus | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-392 | La Plata | Charles | Landline | Verizon Maryland, Inc. |
| 301-393 | Hagerstown | Washington | Landline | Verizon Maryland, Inc. |
| 301-394 | Hyattsville | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-395 | Waldorf | Charles | Cell Phone | Cellco Partnership Dba Veri... |
| 301-396 | Waldorf | Charles | Landline | Verizon Maryland, Inc. |
| 301-397 | Greenbelt | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-398 | Hyattsville | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-399 | Mechanicsville | Saint Marys | Cell Phone | Nextel Communications, Inc. |
| 301-401 | New Windsor | Carroll | Cell Phone | New Cingular Wireless Pcs,... |
| 301-402 | Bethesda | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-403 | Hyattsville | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-404 | Silver Spring | Montgomery | Cell Phone | Sprint Spectrum L.p. |
| 301-405 | College Park | Prince Georges | Landline | Paetec Communications, Inc.... |
| 301-406 | College Park | Prince Georges | Cell Phone | Usa Mobility Wireless, Inc. |
| 301-407 | Poolesville | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-408 | Hyattsville | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-410 | Oxon Hill | Prince Georges | Landline | Unknown |
| 301-411 | Beltsville | Prince Georges | Unknown | |
| 301-412 | Silver Spring | Montgomery | Cell Phone | New Cingular Wireless Pcs,... |
| 301-413 | Rockville | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-414 | Damascus | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-415 | Rockville | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-416 | Hagerstown | Washington | Landline | Verizon Maryland, Inc. |
| 301-417 | Gaithersburg | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-418 | Frederick | Frederick | Landline | Verizon Maryland, Inc. |
| 301-419 | Beltsville | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-420 | District Heights | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-421 | Burtonsville | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-422 | Hyattsville | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-423 | Temple Hills | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-424 | Rockville | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-425 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-426 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-427 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-428 | Germantown | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-429 | Lanham | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-430 | Bowie | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-431 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-432 | Boonsboro | Washington | Landline | Verizon Maryland, Inc. |
| 301-433 | Temple Hills | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-434 | Hyattsville | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-435 | Bethesda | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-436 | Hyattsville | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-437 | Hyattsville | Prince Georges | Cell Phone | Sprint Spectrum L.p. |
| 301-438 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-439 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-440 | Upper Marlboro | Prince Georges | Cell Phone | Nextel Communications, Inc. |
| 301-441 | Greenbelt | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-442 | Upper Marlboro | Prince Georges | Cell Phone | Sprint Spectrum L.p. |
| 301-443 | Rockville | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-444 | Germantown | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-445 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-446 | Greenbelt | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-447 | Emmitsburg | Frederick | Landline | Verizon Maryland, Inc. |
| 301-448 | Hyattsville | Prince Georges | Landline | Comcast Phone Of Northern M... |
| 301-449 | Temple Hills | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-451 | Bethesda | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-452 | Lanham | Prince Georges | Cell Phone | Cellco Partnership Dba Veri... |
| 301-453 | Kitzmiller | Garrett | Landline | Verizon Maryland, Inc. |
| 301-454 | Hyattsville | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-455 | Upper Marlboro | Prince Georges | Cell Phone | Sprint Spectrum L.p. |
| 301-456 | District Heights | Prince Georges | Landline | Comcast Phone Of Northern M... |
| 301-457 | Washington | District Of Columbia | Landline | Verizon Maryland, Inc. |
| 301-458 | Hyattsville | Prince Georges | Landline | Teleport Communications Gro... |
| 301-459 | Lanham | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-460 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-461 | Rockville | Montgomery | Cell Phone | Cellco Partnership Dba Veri... |
| 301-462 | Mount Airy | Frederick | Cell Phone | Sprint Spectrum L.p. Md |
| 301-463 | Lonaconing | Allegany | Landline | Verizon Maryland, Inc. |
| 301-464 | Bowie | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-465 | Hagerstown | Washington | Cell Phone | Sprint Spectrum L.p. Md |
| 301-466 | Upper Marlboro | Prince Georges | Cell Phone | Cellco Partnership Dba Veri... |
| 301-467 | Silver Spring | Montgomery | Cell Phone | Cellco Partnership Dba Veri... |
| 301-468 | Rockville | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-469 | Bethesda | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-470 | Laurel | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-471 | Frederick | Frederick | Cell Phone | Cellco Partnership Dba Veri... |
| 301-472 | Mechanicsville | Saint Marys | Landline | Verizon Maryland, Inc. |
| 301-473 | Frederick | Frederick | Landline | Verizon Maryland, Inc. |
| 301-474 | Greenbelt | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-475 | Leonardtown | Saint Marys | Landline | Verizon Maryland, Inc. |
| 301-476 | Burtonsville | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-477 | Greenbelt | Prince Georges | Landline | Comcast Phone Of Northern M... |
| 301-478 | Oldtown | Allegany | Landline | Verizon Maryland, Inc. |
| 301-479 | Laurel | Prince Georges | Landline | Mci Worldcom Communications... |
| 301-480 | Bethesda | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-481 | Lexington Park | Saint Marys | Cell Phone | Cellco Partnership Dba Veri... |
| 301-482 | Damascus | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-483 | Laurel | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-484 | Hyattsville | Prince Georges | Landline | Comcast Phone Of Northern M... |
| 301-485 | Oxon Hill | Prince Georges | Landline | Comcast Phone Of Northern M... |
| 301-486 | Greenbelt | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-487 | Myersville | Frederick | Landline | Verizon Maryland, Inc. |
| 301-488 | Laurel | Howard | Landline | Verizon Maryland, Inc. |
| 301-489 | Greenbelt | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-490 | Laurel | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-491 | Hagerstown | Washington | Landline | Uscoc Of Cumberland, Inc. D... |
| 301-492 | Bethesda | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-493 | Bethesda | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-494 | Huntingtown | Calvert | Landline | Verizon Maryland, Inc. |
| 301-495 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-496 | Bethesda | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-497 | Laurel | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-498 | Laurel | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-499 | Upper Marlboro | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-501 | Mc Henry | Garrett | Cell Phone | New Cingular Wireless Pcs,... |
| 301-502 | Silver Spring | Montgomery | Cell Phone | Cellco Partnership Dba Veri... |
| 301-503 | Bowie | Prince Georges | Cell Phone | New Cingular Wireless Pcs,... |
| 301-504 | Beltsville | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-505 | Temple Hills | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-507 | Greenbelt | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-508 | Myersville | Frederick | Cell Phone | New Cingular Wireless Pcs,... |
| 301-509 | Silver Spring | Montgomery | Cell Phone | Cellco Partnership Dba Veri... |
| 301-512 | Rockville | Montgomery | Cell Phone | Cellco Partnership Dba Veri... |
| 301-513 | Greenbelt | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-514 | Frederick | Frederick | Cell Phone | Cellco Partnership Dba Veri... |
| 301-515 | Germantown | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-516 | District Heights | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-517 | Rockville | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-518 | Bethesda | Montgomery | Cell Phone | Cellco Partnership Dba Veri... |
| 301-519 | Gaithersburg | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-520 | Silver Spring | Montgomery | Cell Phone | Cellco Partnership Dba Veri... |
| 301-521 | Frederick | Frederick | Landline | Verizon Maryland, Inc. |
| 301-522 | Cumberland | Allegany | Landline | Verizon Maryland, Inc. |
| 301-523 | Silver Spring | Montgomery | Cell Phone | Sprint Spectrum L.p. |
| 301-524 | Frederick | Frederick | Cell Phone | Sprint Spectrum L.p. |
| 301-525 | Gaithersburg | Montgomery | Landline | Quantum Telecommunications,... |
| 301-526 | Bowie | Prince Georges | Cell Phone | New Cingular Wireless Pcs,... |
| 301-527 | Gaithersburg | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-528 | Germantown | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-529 | Gaithersburg | Montgomery | Cell Phone | New Cingular Wireless Pcs,... |
| 301-530 | Bethesda | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-531 | Takoma Park | Montgomery | Landline | Starpower Communications, L... |
| 301-532 | Laurel | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-533 | Oakland | Garrett | Landline | Verizon Maryland, Inc. |
| 301-534 | Hyattsville | Prince Georges | Landline | Ymax Communications Corp. Md |
| 301-535 | Fort Washington | Prince Georges | Cell Phone | New Cingular Wireless Pcs,... |
| 301-536 | Upper Marlboro | Prince Georges | Cell Phone | Nextel Communications, Inc. |
| 301-537 | Upper Marlboro | Prince Georges | Cell Phone | Sprint Spectrum L.p. |
| 301-538 | Laurel | Prince Georges | Cell Phone | New Cingular Wireless Pcs,... |
| 301-539 | La Plata | Charles | Landline | Teleport Communications Gro... |
| 301-540 | Germantown | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-541 | Bowie | Prince Georges | Landline | Teleport Communications Gro... |
| 301-542 | Waldorf | Charles | Landline | Teleport Communications Gro... |
| 301-543 | Laurel | Prince Georges | Landline | Teleport Communications Gro... |
| 301-544 | Annapolis Junction | Howard | Landline | Verizon Maryland, Inc. |
| 301-545 | Rockville | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-547 | Bethesda | Montgomery | Landline | Teleport Communications Gro... |
| 301-548 | Gaithersburg | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-549 | Burtonsville | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-551 | Laurel | Prince Georges | Landline | Baltimorewashington Teleph... |
| 301-552 | Lanham | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-553 | Fort Washington | Prince Georges | Cell Phone | Usa Mobility Wireless, Inc. |
| 301-555 | District Heights | Prince Georges | Landline | Unknown |
| 301-556 | Gaithersburg | Montgomery | Landline | Teleport Communications Gro... |
| 301-558 | Silver Spring | Montgomery | Cell Phone | Usa Mobility Wireless, Inc. |
| 301-559 | Hyattsville | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-560 | Hyattsville | Prince Georges | Landline | Paetec Communications, Inc.... |
| 301-561 | Laurel | Prince Georges | Landline | Baltimorewashington Teleph... |
| 301-562 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-563 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-564 | Bethesda | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-565 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-566 | Frederick | Frederick | Landline | Verizon Maryland, Inc. |
| 301-567 | Oxon Hill | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-568 | District Heights | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-569 | Chevy Chase | Montgomery | Landline | Global Naps South, Inc. Md |
| 301-570 | Olney | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-571 | Bethesda | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-572 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-573 | Hagerstown | Washington | Cell Phone | Nextel Communications, Inc. |
| 301-574 | Upper Marlboro | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-575 | Laurel | Prince Georges | Landline | Us Lec Of Virginia, Llc Dc |
| 301-576 | Silver Spring | Montgomery | Landline | Paetec Communications, Inc.... |
| 301-577 | Lanham | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-578 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-579 | Brandywine | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-580 | Silver Spring | Montgomery | Cell Phone | Cellco Partnership Dba Veri... |
| 301-581 | Bethesda | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-582 | Hagerstown | Washington | Landline | Verizon Maryland, Inc. |
| 301-583 | Hyattsville | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-584 | Derwood | Montgomery | Landline | Baltimorewashington Teleph... |
| 301-585 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-586 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-587 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-588 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-589 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-590 | Gaithersburg | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-591 | Gaithersburg | Montgomery | Landline | Paetec Communications, Inc.... |
| 301-592 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-593 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-594 | Bethesda | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-595 | Beltsville | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-596 | Columbia | Howard | Landline | Verizon Maryland, Inc. |
| 301-597 | Hagerstown | Washington | Landline | New Frontiers Telecommunica... |
| 301-598 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-599 | Upper Marlboro | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-600 | Frederick | Frederick | Landline | Verizon Maryland, Inc. |
| 301-601 | Germantown | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-602 | Rockville | Montgomery | Cell Phone | Cellco Partnership Dba Veri... |
| 301-603 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-604 | Laurel | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-605 | Rockville | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-606 | Frederick | Frederick | Cell Phone | Cellco Partnership Dba Veri... |
| 301-607 | Mount Airy | Frederick | Landline | Verizon Maryland, Inc. |
| 301-608 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-609 | La Plata | Charles | Landline | Verizon Maryland, Inc. |
| 301-610 | Rockville | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-613 | Silver Spring | Montgomery | Cell Phone | Sprint Spectrum L.p. |
| 301-614 | Greenbelt | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-615 | Rockville | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-616 | Oakland | Garrett | Landline | Uscoc Of Cumberland, Inc. D... |
| 301-617 | Laurel | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-618 | Hyattsville | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-619 | Frederick | Frederick | Landline | Verizon Maryland, Inc. |
| 301-620 | Frederick | Frederick | Landline | Verizon Maryland, Inc. |
| 301-621 | Columbia | Howard | Landline | Verizon Maryland, Inc. |
| 301-622 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-623 | Beltsville | Prince Georges | Landline | Teleport Communications Gro... |
| 301-624 | Frederick | Frederick | Landline | Verizon Maryland, Inc. |
| 301-625 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-626 | Bethesda | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-627 | Upper Marlboro | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-628 | Silver Spring | Montgomery | Landline | Teleport Communications Gro... |
| 301-629 | Rockville | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-630 | Temple Hills | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-631 | Frederick | Frederick | Landline | Verizon Maryland, Inc. |
| 301-632 | Waldorf | Charles | Landline | Verizon Maryland, Inc. |
| 301-633 | Hyattsville | Prince Georges | Cell Phone | New Cingular Wireless Pcs,... |
| 301-634 | Bethesda | Montgomery | Landline | Teleport Communications Gro... |
| 301-635 | Hyattsville | Prince Georges | Landline | New Frontiers Telecommunica... |
| 301-636 | Bowie | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-637 | Rockville | Montgomery | Landline | Level 3 Communications, Llc... |
| 301-638 | Waldorf | Charles | Landline | Verizon Maryland, Inc. |
| 301-639 | Frederick | Frederick | Cell Phone | Cellco Partnership Dba Veri... |
| 301-640 | Rockville | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-641 | Germantown | Montgomery | Cell Phone | Cellco Partnership Dba Veri... |
| 301-642 | Upper Marlboro | Prince Georges | Cell Phone | New Cingular Wireless Pcs,... |
| 301-643 | Waldorf | Charles | Cell Phone | Cellco Partnership Dba Veri... |
| 301-644 | Frederick | Frederick | Landline | Verizon Maryland, Inc. |
| 301-645 | Waldorf | Charles | Landline | Verizon Maryland, Inc. |
| 301-646 | Washington | District Of Columbia | Cell Phone | New Cingular Wireless Pcs,... |
| 301-647 | Bethesda | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-648 | Silver Spring | Montgomery | Cell Phone | New Cingular Wireless Pcs,... |
| 301-649 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-650 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-651 | Gaithersburg | Montgomery | Cell Phone | Cellco Partnership Dba Veri... |
| 301-652 | Chevy Chase | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-653 | Fort Washington | Prince Georges | Cell Phone | New Cingular Wireless Pcs,... |
| 301-654 | Chevy Chase | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-655 | Derwood | Montgomery | Cell Phone | New Cingular Wireless Pcs,... |
| 301-656 | Chevy Chase | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-657 | Chevy Chase | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-658 | Silver Spring | Montgomery | Landline | Teleport Communications Gro... |
| 301-659 | Washington | District Of Columbia | Cell Phone | New Cingular Wireless Pcs,... |
| 301-660 | Olney | Montgomery | Cell Phone | New Cingular Wireless Pcs,... |
| 301-661 | Upper Marlboro | Prince Georges | Cell Phone | New Cingular Wireless Pcs,... |
| 301-662 | Frederick | Frederick | Landline | Verizon Maryland, Inc. |
| 301-663 | Frederick | Frederick | Landline | Verizon Maryland, Inc. |
| 301-664 | Bethesda | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-665 | Hagerstown | Washington | Landline | Verizon Maryland, Inc. |
| 301-666 | Lanham | Prince Georges | Landline | Teleport Communications Gro... |
| 301-667 | Hagerstown | Washington | Cell Phone | New Cingular Wireless Pcs,... |
| 301-668 | Frederick | Frederick | Landline | Verizon Maryland, Inc. |
| 301-669 | District Heights | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-670 | Gaithersburg | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-671 | Hagerstown | Washington | Landline | New Frontiers Telecommunica... |
| 301-672 | Bowie | Prince Georges | Cell Phone | Nextel Communications, Inc. |
| 301-673 | Upper Marlboro | Prince Georges | Landline | New Frontiers Telecommunica... |
| 301-674 | Rockville | Montgomery | Cell Phone | Nextel Communications, Inc. |
| 301-675 | Bowie | Prince Georges | Cell Phone | Omnipoint Communications Ca... |
| 301-676 | Frederick | Frederick | Cell Phone | New Cingular Wireless Pcs,... |
| 301-677 | Fort George G Meade | Anne Arundel | Landline | Teleport Communications Gro... |
| 301-678 | Hancock | Washington | Landline | Verizon Maryland, Inc. |
| 301-679 | Waldorf | Charles | Landline | Teleport Communications Gro... |
| 301-680 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-681 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-682 | Frederick | Frederick | Landline | Verizon Maryland, Inc. |
| 301-683 | Hyattsville | Prince Georges | Landline | Teleport Communications Gro... |
| 301-684 | Indian Head | Charles | Landline | Teleport Communications Gro... |
| 301-685 | Frederick | Frederick | Landline | Teleport Communications Gro... |
| 301-686 | Oxon Hill | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-687 | Frostburg | Allegany | Landline | Verizon Maryland, Inc. |
| 301-688 | Fort George G Meade | Anne Arundel | Landline | Verizon Maryland, Inc. |
| 301-689 | Frostburg | Allegany | Landline | Verizon Maryland, Inc. |
| 301-690 | Leonardtown | Saint Marys | Landline | Idt America Corp Md |
| 301-691 | Oakton | Fairfax | Landline | Teleport Communications Gro... |
| 301-692 | Rockville | Montgomery | Landline | Teleport Communications Gro... |
| 301-693 | Boyds | Montgomery | Cell Phone | Omnipoint Communications Ca... |
| 301-694 | Frederick | Frederick | Landline | Verizon Maryland, Inc. |
| 301-695 | Frederick | Frederick | Landline | Verizon Maryland, Inc. |
| 301-696 | Frederick | Frederick | Landline | Verizon Maryland, Inc. |
| 301-697 | Cumberland | Allegany | Cell Phone | New Cingular Wireless Pcs,... |
| 301-698 | Frederick | Frederick | Landline | Verizon Maryland, Inc. |
| 301-699 | Hyattsville | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-701 | Chevy Chase | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-702 | Temple Hills | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-703 | Mount Airy | Frederick | Landline | Level 3 Communications, Llc... |
| 301-704 | Silver Spring | Montgomery | Cell Phone | Cellco Partnership Dba Veri... |
| 301-705 | Waldorf | Charles | Landline | Verizon Maryland, Inc. |
| 301-706 | Silver Spring | Montgomery | Cell Phone | Cellco Partnership Dba Veri... |
| 301-707 | Cumberland | Allegany | Landline | Uscoc Of Cumberland, Inc. D... |
| 301-710 | Waldorf | Charles | Landline | Level 3 Communications, Llc... |
| 301-712 | Libertytown | Frederick | Landline | Mcimetro Access Transmissio... |
| 301-713 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-714 | Hagerstown | Washington | Landline | Verizon Maryland, Inc. |
| 301-715 | Cumberland | Allegany | Landline | Teleport Communications Gro... |
| 301-716 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-717 | Bethesda | Montgomery | Cell Phone | Cellco Partnership Dba Veri... |
| 301-718 | Chevy Chase | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-719 | Clinton | Prince Georges | Landline | Teleport Communications Gro... |
| 301-720 | Hyattsville | Prince Georges | Landline | Teleport Communications Gro... |
| 301-721 | Gaithersburg | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-722 | Cumberland | Allegany | Landline | Verizon Maryland, Inc. |
| 301-723 | Cumberland | Allegany | Landline | Verizon Maryland, Inc. |
| 301-724 | Cumberland | Allegany | Landline | Verizon Maryland, Inc. |
| 301-725 | Laurel | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-726 | Ridgeley | Mineral | Landline | Unknown |
| 301-727 | Baltimore | Baltimore City | Landline | Baltimorewashington Teleph... |
| 301-728 | Rockville | Montgomery | Cell Phone | Omnipoint Communications Ca... |
| 301-729 | Cumberland | Allegany | Landline | Verizon Maryland, Inc. |
| 301-730 | Hagerstown | Washington | Cell Phone | New Cingular Wireless Pcs,... |
| 301-731 | Lanham | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-733 | Hagerstown | Washington | Landline | Verizon Maryland, Inc. |
| 301-734 | Riverdale | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-735 | District Heights | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-736 | District Heights | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-737 | Lexington Park | Saint Marys | Landline | Verizon Maryland, Inc. |
| 301-738 | Rockville | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-739 | Hagerstown | Washington | Landline | Verizon Maryland, Inc. |
| 301-740 | Gaithersburg | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-741 | Laurel | Prince Georges | Landline | Level 3 Communications, Llc... |
| 301-742 | Bowie | Prince Georges | Cell Phone | New Cingular Wireless Pcs,... |
| 301-743 | Indian Head | Charles | Landline | Verizon Maryland, Inc. |
| 301-744 | Indian Head | Charles | Landline | Verizon Maryland, Inc. |
| 301-745 | Hagerstown | Washington | Landline | Verizon Maryland, Inc. |
| 301-746 | Friendsville | Garrett | Landline | Verizon Maryland, Inc. |
| 301-747 | Fort Washington | Prince Georges | Landline | Teleport Communications Gro... |
| 301-748 | Frederick | Frederick | Cell Phone | Nextel Communications, Inc. |
| 301-749 | Oxon Hill | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-750 | Accident | Garrett | Landline | Core Communications, Inc. Md |
| 301-751 | Waldorf | Charles | Cell Phone | Cellco Partnership Dba Veri... |
| 301-752 | Waldorf | Charles | Cell Phone | Cellco Partnership Dba Veri... |
| 301-753 | Indian Head | Charles | Landline | Verizon Maryland, Inc. |
| 301-754 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-755 | Silver Spring | Montgomery | Landline | Mci Worldcom Communications... |
| 301-756 | Frederick | Frederick | Landline | Tw Telecom Of Maryland Llc... |
| 301-757 | Patuxent River | Saint Marys | Landline | Verizon Maryland, Inc. |
| 301-758 | Columbia | Howard | Cell Phone | Cellco Partnership Dba Veri... |
| 301-759 | Cumberland | Allegany | Landline | Verizon Maryland, Inc. |
| 301-760 | Bethesda | Montgomery | Landline | Level 3 Communications, Llc... |
| 301-761 | Olney | Montgomery | Landline | Level 3 Communications, Llc... |
| 301-762 | Rockville | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-763 | Suitland | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-764 | Hyattsville | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-765 | Potomac | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-766 | Hagerstown | Washington | Landline | Verizon Maryland, Inc. |
| 301-767 | Bethesda | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-768 | Silver Spring | Montgomery | Landline | Level 3 Communications, Llc... |
| 301-769 | Avenue | Saint Marys | Landline | Verizon Maryland, Inc. |
| 301-770 | Rockville | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-771 | Bethesda | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-772 | Hyattsville | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-773 | Hyattsville | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-774 | Olney | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-775 | Silver Spring | Montgomery | Cell Phone | Cellco Partnership Dba Veri... |
| 301-776 | Laurel | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-777 | Cumberland | Allegany | Landline | Verizon Maryland, Inc. |
| 301-778 | District Heights | Prince Georges | Landline | Mci Worldcom Communications... |
| 301-779 | Hyattsville | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-780 | Upper Marlboro | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-781 | Chevy Chase | Montgomery | Landline | New Frontiers Telecommunica... |
| 301-782 | Brandywine | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-783 | Chevy Chase | Montgomery | Landline | New Frontiers Telecommunica... |
| 301-784 | Cumberland | Allegany | Landline | Verizon Maryland, Inc. |
| 301-785 | Silver Spring | Montgomery | Cell Phone | Cellco Partnership Dba Veri... |
| 301-786 | Rawlings | Allegany | Landline | Verizon Maryland, Inc. |
| 301-787 | Bethesda | Montgomery | Cell Phone | Cellco Partnership Dba Veri... |
| 301-788 | Frederick | Frederick | Cell Phone | Cellco Partnership Dba Veri... |
| 301-789 | Bowie | Prince Georges | Landline | Core Communications, Inc. Pa |
| 301-790 | Hagerstown | Washington | Landline | Verizon Maryland, Inc. |
| 301-791 | Hagerstown | Washington | Landline | Verizon Maryland, Inc. |
| 301-792 | Hyattsville | Prince Georges | Cell Phone | Omnipoint Communications Ca... |
| 301-793 | Silver Spring | Montgomery | Cell Phone | Omnipoint Communications Ca... |
| 301-794 | Lanham | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-795 | Rockville | Montgomery | Landline | Mcimetro Access Transmissio... |
| 301-796 | Laurel | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-797 | Hagerstown | Washington | Landline | Verizon Maryland, Inc. |
| 301-798 | Ijamsville | Frederick | Landline | Verizon Maryland, Inc. |
| 301-799 | Boonsboro | Washington | Landline | Core Communications, Inc. Md |
| 301-801 | Washington | District Of Columbia | Cell Phone | Cellco Partnership Dba Veri... |
| 301-802 | Washington | District Of Columbia | Cell Phone | Cellco Partnership Dba Veri... |
| 301-803 | Bethesda | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-804 | Washington | District Of Columbia | Landline | Mcimetro Access Transmissio... |
| 301-805 | Bowie | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-806 | Upper Marlboro | Prince Georges | Cell Phone | Sprint Spectrum L.p. |
| 301-807 | Bowie | Prince Georges | Cell Phone | Cellco Partnership Dba Veri... |
| 301-808 | Upper Marlboro | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-809 | Bowie | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-810 | Adamstown | Frederick | Landline | At&t Local |
| 301-812 | Owings | Calvert | Landline | Verizon Maryland, Inc. |
| 301-813 | Laurel | Prince Georges | Landline | Baltimorewashington Teleph... |
| 301-814 | Bethesda | Montgomery | Cell Phone | New Cingular Wireless Pcs,... |
| 301-815 | Frederick | Frederick | Landline | Verizon Maryland, Inc. |
| 301-816 | Rockville | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-817 | District Heights | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-818 | Newburg | Charles | Landline | Verizon Maryland, Inc. |
| 301-820 | Germantown | Montgomery | Landline | At&t Local |
| 301-821 | Upper Marlboro | Prince Georges | Landline | At&t Local |
| 301-822 | Easton | Talbot | Landline | At&t Local |
| 301-823 | Beltsville | Prince Georges | Landline | At&t Local |
| 301-824 | Smithsburg | Washington | Landline | Verizon Maryland, Inc. |
| 301-825 | Rockville | Montgomery | Landline | At&t Local |
| 301-826 | Lexington Park | Saint Marys | Landline | Verizon Maryland, Inc. |
| 301-827 | Rockville | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-828 | Chevy Chase | Montgomery | Landline | At&t Local |
| 301-829 | Mount Airy | Frederick | Landline | Verizon Maryland, Inc. |
| 301-830 | Silver Spring | Montgomery | Landline | At&t Local |
| 301-831 | Mount Airy | Frederick | Landline | Verizon Maryland, Inc. |
| 301-832 | Hyattsville | Prince Georges | Landline | At&t Local |
| 301-833 | Beltsville | Prince Georges | Landline | Teleport Communications Gro... |
| 301-834 | Brunswick | Frederick | Landline | Verizon Maryland, Inc. |
| 301-836 | Suitland | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-837 | Greenbelt | Prince Georges | Landline | Mcimetro Access Transmissio... |
| 301-838 | Rockville | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-839 | Oxon Hill | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-840 | Gaithersburg | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-841 | Bethesda | Montgomery | Landline | Mcimetro Access Transmissio... |
| 301-842 | Clear Spring | Washington | Landline | Verizon Maryland, Inc. |
| 301-843 | Waldorf | Charles | Landline | Verizon Maryland, Inc. |
| 301-844 | Waldorf | Charles | Landline | Verizon Maryland, Inc. |
| 301-845 | Walkersville | Frederick | Landline | Verizon Maryland, Inc. |
| 301-846 | Frederick | Frederick | Landline | Verizon Maryland, Inc. |
| 301-847 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-848 | Waldorf | Charles | Cell Phone | Cellco Partnership Dba Veri... |
| 301-849 | Boyds | Montgomery | Landline | New Frontiers Telecommunica... |
| 301-850 | Reston | Fairfax | Landline | Level 3 Communications, Llc... |
| 301-851 | Riverdale | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-852 | College Park | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-853 | Hyattsville | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-854 | Highland | Howard | Landline | Verizon Maryland, Inc. |
| 301-855 | Owings | Calvert | Landline | Verizon Maryland, Inc. |
| 301-856 | Clinton | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-857 | Clear Spring | Washington | Landline | Core Communications, Inc. Md |
| 301-858 | Crofton | Anne Arundel | Landline | Verizon Maryland, Inc. |
| 301-859 | Oakland | Garrett | Landline | Level 3 Communications, Llc... |
| 301-860 | Bowie | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-861 | Waldorf | Charles | Landline | Level 3 Communications, Llc... |
| 301-862 | Lexington Park | Saint Marys | Landline | Verizon Maryland, Inc. |
| 301-863 | Lexington Park | Saint Marys | Landline | Verizon Maryland, Inc. |
| 301-864 | Hyattsville | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-865 | New Market | Frederick | Landline | Verizon Maryland, Inc. |
| 301-866 | Lexington Park | Saint Marys | Landline | Verizon Maryland, Inc. |
| 301-867 | Bowie | Prince Georges | Landline | Mcimetro Access Transmissio... |
| 301-868 | Clinton | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-869 | Gaithersburg | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-870 | Waldorf | Charles | Landline | Verizon Maryland, Inc. |
| 301-871 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-872 | Ridge | Saint Marys | Landline | Verizon Maryland, Inc. |
| 301-873 | Silver Spring | Montgomery | Cell Phone | Cellco Partnership Dba Veri... |
| 301-874 | Frederick | Frederick | Landline | Verizon Maryland, Inc. |
| 301-875 | Laurel | Prince Georges | Landline | Nationsline, Inc. Md |
| 301-876 | Cumberland | Allegany | Landline | Level 3 Communications, Llc... |
| 301-877 | Clinton | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-878 | Cascade | Washington | Landline | Unknown |
| 301-879 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-880 | Great Mills | Saint Marys | Landline | Level 3 Communications, Llc... |
| 301-881 | Rockville | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-882 | New Market | Frederick | Landline | Core Communications, Inc. Md |
| 301-883 | Bowie | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-884 | Mechanicsville | Saint Marys | Landline | Verizon Maryland, Inc. |
| 301-885 | Waldorf | Charles | Landline | Verizon Maryland, Inc. |
| 301-886 | Annapolis | Anne Arundel | Landline | Verizon Maryland, Inc. |
| 301-887 | Hyattsville | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-888 | Brandywine | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-889 | Shady Side | Anne Arundel | Landline | Verizon Maryland, Inc. |
| 301-890 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-891 | Takoma Park | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-892 | Hyattsville | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-893 | Waldorf | Charles | Landline | Verizon Maryland, Inc. |
| 301-894 | Temple Hills | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-895 | Grantsville | Garrett | Landline | Verizon Maryland, Inc. |
| 301-896 | Bethesda | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-897 | Bethesda | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-898 | Frederick | Frederick | Landline | Verizon Maryland, Inc. |
| 301-899 | Temple Hills | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-901 | Towson | Baltimore | Landline | Verizon Maryland, Inc. |
| 301-902 | Beltsville | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-903 | Germantown | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-904 | Hollywood | Saint Marys | Cell Phone | Cellco Partnership Dba Veri... |
| 301-905 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-906 | Silver Spring | Montgomery | Cell Phone | New Cingular Wireless Pcs,... |
| 301-907 | Chevy Chase | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-908 | Rockville | Montgomery | Cell Phone | Cellco Partnership Dba Veri... |
| 301-909 | Hyattsville | Prince Georges | Landline | Mcimetro Access Transmissio... |
| 301-910 | Hyattsville | Prince Georges | Cell Phone | New Cingular Wireless Pcs,... |
| 301-912 | Odenton | Anne Arundel | Landline | Verizon Maryland, Inc. |
| 301-913 | Bethesda | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-914 | College Park | Prince Georges | Cell Phone | Usa Mobility Wireless, Inc. |
| 301-915 | Bethesda | Montgomery | Landline | Starpower Communications, L... |
| 301-916 | Germantown | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-917 | Gaithersburg | Montgomery | Landline | Starpower Communications, L... |
| 301-918 | Lanham | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-919 | Washington | District Of Columbia | Cell Phone | New Cingular Wireless Pcs,... |
| 301-920 | Silver Spring | Montgomery | Landline | Starpower Communications, L... |
| 301-921 | Gaithersburg | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-922 | Upper Marlboro | Prince Georges | Cell Phone | Cellco Partnership Dba Veri... |
| 301-923 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-924 | Olney | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-925 | Bowie | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-926 | Gaithersburg | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-927 | Hyattsville | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-928 | Gaithersburg | Montgomery | Cell Phone | Cellco Partnership Dba Veri... |
| 301-929 | Rockville | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-930 | Indian Head | Charles | Landline | Verizon Maryland, Inc. |
| 301-931 | Beltsville | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-932 | Waldorf | Charles | Landline | Verizon Maryland, Inc. |
| 301-933 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-934 | La Plata | Charles | Landline | Verizon Maryland, Inc. |
| 301-935 | College Park | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-936 | Suitland | Prince Georges | Landline | Unknown |
| 301-937 | Beltsville | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-938 | Rockville | Montgomery | Cell Phone | Cellco Partnership Dba Veri... |
| 301-939 | Laurel | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-940 | Jessup | Howard | Landline | Verizon Maryland, Inc. |
| 301-941 | Bethesda | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-942 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-943 | Rockville | Montgomery | Cell Phone | Cellco Partnership Dba Veri... |
| 301-944 | Gaithersburg | Montgomery | Landline | Mcimetro Access Transmissio... |
| 301-945 | Rockville | Montgomery | Landline | Mcimetro Access Transmissio... |
| 301-946 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-947 | Gaithersburg | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-948 | Gaithersburg | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-949 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-950 | Silver Spring | Montgomery | Landline | Unknown |
| 301-951 | Chevy Chase | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-952 | Upper Marlboro | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-953 | Laurel | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-954 | Baltimore | Baltimore City | Landline | Unknown |
| 301-955 | Hyattsville | Prince Georges | Landline | Mcimetro Access Transmissio... |
| 301-956 | Gaithersburg | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-957 | Laurel | Prince Georges | Landline | Mcimetro Access Transmissio... |
| 301-960 | Silver Spring | Montgomery | Landline | Mcimetro Access Transmissio... |
| 301-961 | Bethesda | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-962 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-963 | Gaithersburg | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-965 | Oxon Hill | Prince Georges | Landline | Mcimetro Access Transmissio... |
| 301-966 | Bethesda | Montgomery | Landline | Mcimetro Access Transmissio... |
| 301-967 | District Heights | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-968 | Bethesda | Montgomery | Landline | Mci Worldcom Communications... |
| 301-969 | Brunswick | Frederick | Landline | Comcast Phone Of Northern M... |
| 301-970 | Annapolis | Anne Arundel | Landline | Verizon Maryland, Inc. |
| 301-971 | Bel Alton | Charles | Landline | Starpower Communications, L... |
| 301-972 | Germantown | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-973 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-974 | Waldorf | Charles | Landline | Starpower Communications, L... |
| 301-975 | Gaithersburg | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-977 | Gaithersburg | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-978 | Gaithersburg | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-979 | Gaithersburg | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-980 | Upper Marlboro | Prince Georges | Cell Phone | Cellco Partnership Dba Veri... |
| 301-981 | Andrews Afb | Prince Georges | Landline | Tw Telecom Of Maryland Llc... |
| 301-982 | Greenbelt | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-983 | Potomac | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-984 | Rockville | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-985 | Hyattsville | Prince Georges | Landline | Verizon Maryland, Inc. |
| 301-986 | Chevy Chase | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-987 | Gaithersburg | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-988 | Hagerstown | Washington | Landline | Uscoc Of Cumberland, Inc. D... |
| 301-989 | Silver Spring | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-990 | Gaithersburg | Montgomery | Landline | Verizon Maryland, Inc. |
| 301-991 | Hagerstown | Washington | Cell Phone | Sprint Spectrum L.p. Md |
| 301-992 | Hagerstown | Washington | Cell Phone | Sprint Spectrum L.p. Md |
| 301-993 | Walkersville | Frederick | Landline | Verizon Maryland, Inc. |
| 301-994 | Valley Lee | Saint Marys | Landline | Verizon Maryland, Inc. |
| 301-995 | Saint Inigoes | Saint Marys | Landline | Verizon Maryland, Inc. |
| 301-996 | Silver Spring | Montgomery | Cell Phone | Sprint Spectrum L.p. |
| 301-997 | Leonardtown | Saint Marys | Landline | Verizon Maryland, Inc. |
| 301-998 | Rockville | Montgomery | Landline | Verizon Maryland, Inc. |