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Area Codes > 443 > Central Office Codes

Exchange Rate Center State Operating Company
443-306 SEVERNA PK MD SPRINT SPECTRUM L.P.
443-307 BEL AIR MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD
443-308 SEVERN MD ALLEGIANCE TELECOM, INC. - MD
443-309 ELKTON MD NEXTEL COMMUNICATIONS, INC.
443-310 BALTIMORE MD NEW CINGULAR WIRELESS PCS, LLC - DC
443-311 MD
443-312 BRYNPKLNCM MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD
443-313 FORK MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD
443-314 PARKVILLE MD SBC LONG DISTANCE, LLC DBA AT&T LONG DISTANCE - MD
443-315 CATONSVL MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD
443-316 WOODLAWN MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD
443-317 CHASE MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD
443-318 COCKEYSVL MD CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD
443-319 COLUMBIA MD CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD
443-320 BALTIMORE MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD
443-321 ANNAPOLIS MD PAETEC COMMUNICATIONS, INC. - MD
443-322 TOWSON MD CAVALIER EAST LLC - MD
443-323 SHARPTOWN MD CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD
443-324 BALTIMORE MD NEXTEL COMMUNICATIONS, INC.
443-325 ELLICOTTCY MD CAVALIER TELEPHONE MID-ATLANTIC. LLC - MD
443-326 BALTIMORE MD NEW CINGULAR WIRELESS PCS, LLC - DC
443-327 ABERDEEN MD CAVALIER EAST LLC - MD
443-328 SYKESVILLE MD GLOBAL NAPS SOUTH, INC. - MD
443-329 WATERLO236 MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD
443-330 COCKEYSVL MD CAVALIER TELEPHONE MID-ATLANTIC. LLC - MD
443-331 TANEYTOWN MD GLOBAL NAPS SOUTH, INC. - MD
443-332 CROFTON MD CAVALIER EAST LLC - MD
443-334 PIKESVILLE MD ALLEGIANCE TELECOM, INC. - MD
443-335 BRYNPKLNCM MD GLOBAL NAPS SOUTH, INC. - MD
443-336 ANNAPOLIS MD NEXTEL COMMUNICATIONS, INC.
443-337 SPARROWSPT MD GLOBAL NAPS SOUTH, INC. - MD
443-338 SPARKSGLNC MD GLOBAL NAPS SOUTH, INC. - MD
443-339 SHERWD FOR MD GLOBAL NAPS SOUTH, INC. - MD
443-340 WESTMINSTR MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-341 CATONSVL MD LEVEL 3 COMMUNICATIONS, LLC - MD
443-342 SOLOMONS MD GLOBAL NAPS SOUTH, INC. - MD
443-343 MILLERSVL MD TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD
443-344 SEVERNA PK MD CORE COMMUNICATIONS, INC. - MD
443-345 ABERDEEN MD LEVEL 3 COMMUNICATIONS, LLC - MD
443-346 SEVERNA PK MD GLOBAL NAPS SOUTH, INC. - MD
443-347 CARDIFF MD GLOBAL NAPS SOUTH, INC. - MD
443-348 WOODLAWN MD TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD
443-349 SILVER RUN MD CORE COMMUNICATIONS, INC. - MD
443-350 ELKTON MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-351 ODENTON MD US LEC OF MARYLAND, INC.
443-352 PIKESVILLE MD AT&T LOCAL
443-353 COCKEYSVL MD VERIZON MARYLAND, INC.
443-354 GLENBURNIE MD LEVEL 3 COMMUNICATIONS, LLC - MD
443-355 ELLICOTTCY MD LEVEL 3 COMMUNICATIONS, LLC - MD
443-356 BEL AIR MD LEVEL 3 COMMUNICATIONS, LLC - MD
443-357 PIKESVILLE MD VERIZON MARYLAND, INC.
443-359 DELMAR MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-360 ABERDEEN MD TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD
443-361 SYKESVILLE MD CORE COMMUNICATIONS, INC. - MD
443-362 EASTON MD OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC
443-363 SEVERN MD GLOBAL NAPS SOUTH, INC. - MD
443-364 ELLICOTTCY MD TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD
443-365 SALISBURY MD OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC
443-366 SALISBURY MD SPRINT SPECTRUM L.P.
443-367 COLUMBIA MD VERIZON MARYLAND, INC.
443-368 WESTMINSTR MD CORE COMMUNICATIONS, INC. - MD
443-369 BEL AIR MD CORE COMMUNICATIONS, INC. - MD
443-370 ANNAPOLIS MD NEW CINGULAR WIRELESS PCS, LLC - DC
443-371 BEL AIR MD BROADWING COMMUNICATIONS. LLC - MD
443-372 EDGEWOOD MD US LEC OF MARYLAND, INC.
443-373 OCEAN CITY MD SPRINT SPECTRUM L.P.
443-374 ABERDEEN MD CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD
443-375 HAMPSTEAD MD NEXTEL COMMUNICATIONS, INC.
443-376 DUNDALK MD TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD
443-378 BALTIMORE MD NEXTEL COMMUNICATIONS, INC.
443-379 PIKESVILLE MD COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD
443-380 WOODLAWN MD WINSTAR COMMUNICATIONS, LLC - MD
443-381 REISTERSTN MD GLOBAL NAPS SOUTH, INC. - MD
443-382 CAMBRIDGE MD CORE COMMUNICATIONS, INC. - MD
443-383 SILVER RUN MD GLOBAL NAPS SOUTH, INC. - MD
443-384 PARKVILLE MD CAVALIER TELEPHONE MID-ATLANTIC. LLC - MD
443-385 EASTON MD CORE COMMUNICATIONS, INC. - MD
443-386 BALTIMORE MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-387 POCOMOKE MD CORE COMMUNICATIONS, INC. - MD
443-388 BALTIMORE MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-389 SALISBURY MD CORE COMMUNICATIONS, INC. - MD
443-390 CHURCHVL MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD
443-391 COCKEYSVL MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD
443-392 BALTIMORE MD AT&T LOCAL
443-393 COLUMBIA MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD
443-394 PIKESVILLE MD VERIZON MARYLAND, INC.
443-396 ODENTON MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD
443-398 SYKESVILLE MD NEXTEL COMMUNICATIONS, INC.
443-399 DUNDALK MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD
443-400 BRYNPKLNCM MD XO MARYLAND, LLC
443-402 EDGEWOOD MD TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD
443-403 ABERDEEN MD BROADWING COMMUNICATIONS. LLC - MD
443-404 SOLOMONS MD SPRINT SPECTRUM L.P.
443-405 RANDALLSTN MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD
443-406 ELKTON MD TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD
443-407 DUNDALK MD ALLEGIANCE TELECOM, INC. - MD
443-408 SPARROWSPT MD XO MARYLAND, LLC
443-409 EDGEWOOD MD CAVALIER EAST LLC - MD
443-410 MD
443-411 MD