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Area Codes > 443 > Central Office Codes

Exchange Rate Center State Operating Company
443-412 CHURCHVL MD TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD
443-413 BALTIMORE MD SPRINT SPECTRUM L.P.
443-414 BALTIMORE MD SPRINT SPECTRUM L.P.
443-415 BALTIMORE MD SPRINT SPECTRUM L.P.
443-416 BALTIMORE MD SPRINT SPECTRUM L.P.
443-417 FALLSTON MD TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD
443-418 BALTIMORE MD SPRINT SPECTRUM L.P.
443-419 GLENWOOD MD CAVALIER EAST LLC - MD
443-420 ELLICOTTCY MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD
443-421 FORK MD NEW CINGULAR WIRELESS PCS, LLC - DC
443-423 BALTIMORE MD BROADWING COMMUNICATIONS. LLC - MD
443-424 CARDIFF MD TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD
443-425 PARKVILLE MD AT&T LOCAL
443-426 RANDALLSTN MD PAETEC COMMUNICATIONS, INC. - MD
443-427 PRINCEANNE MD CORE COMMUNICATIONS, INC. - MD
443-428 COCKEYSVL MD CORE COMMUNICATIONS, INC. - MD
443-429 WOODLAWN MD CAVALIER TELEPHONE MID-ATLANTIC. LLC - MD
443-430 COLUMBIA MD XO MARYLAND, LLC
443-431 RANDALLSTN MD GLOBAL NAPS SOUTH, INC. - MD
443-432 PRINCEFRCK MD GLOBAL NAPS SOUTH, INC. - MD
443-433 ANNAPOLIS MD XO MARYLAND, LLC
443-434 FEDERALSBG MD NATIONSLINE, INC.-MD
443-435 ESSEX MD CAVALIER TELEPHONE MID-ATLANTIC. LLC - MD
443-436 WOODLAWN MD VERIZON MARYLAND, INC.
443-437 POCOMOKE MD NATIONSLINE, INC.-MD
443-439 TRAPPE MD NATIONSLINE, INC.-MD
443-440 ANNAPOLIS MD BROADSTREET COMMUNICATIONS, INC. - MD
443-441 GLENWOOD MD TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD
443-442 PARKVILLE MD CAVALIER EAST LLC - MD
443-443 MD
443-444 BALTIMORE MD VERIZON MARYLAND, INC.
443-445 ELKRIDGE MD SBC LONG DISTANCE, LLC DBA AT&T LONG DISTANCE - MD
443-446 QUEENSTOWN MD NATIONSLINE, INC.-MD
443-448 DENTON MD NATIONSLINE, INC.-MD
443-449 BALTIMORE MD BROADVIEW NETWORKS, INC. - MD
443-450 PIKESVILLE MD LEVEL 3 COMMUNICATIONS, LLC - MD
443-451 BALTIMORE MD PAETEC COMMUNICATIONS, INC. - MD
443-452 BALTIMORE MD US LEC OF MARYLAND, INC.
443-453 BALTIMORE MD NEUTRAL TANDEM-MARYLAND, LLC - MD
443-454 ANNAPOLIS MD OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC
443-455 BALTIMORE MD VERIZON MARYLAND, INC.
443-456 EDGEWOOD MD AT&T LOCAL
443-457 BRYNPKLNCM MD TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD
443-458 ANNAPOLIS MD ALLEGIANCE TELECOM, INC. - MD
443-459 ELKRIDGE MD PAETEC COMMUNICATIONS, INC. - MD
443-460 ESSEX MD ALLEGIANCE TELECOM, INC. - MD
443-461 PARKVILLE MD US LEC OF MARYLAND, INC.
443-463 BALTIMORE MD NEXTEL COMMUNICATIONS, INC.
443-464 BEL AIR MD BROADSTREET COMMUNICATIONS, INC. - MD
443-465 TOWSON MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-466 ELKTON MD SPRINT SPECTRUM L.P.
443-468 BALTIMORE MD SPRINT SPECTRUM L.P.
443-470 TOWSON MD US LEC OF MARYLAND, INC.
443-471 PIKESVILLE MD US LEC OF MARYLAND, INC.
443-472 COLUMBIA MD LEVEL 3 COMMUNICATIONS, LLC - MD
443-473 BALTIMORE MD SPRINT SPECTRUM L.P.
443-474 CATONSVL MD NEW CINGULAR WIRELESS PCS, LLC - DC
443-475 SEVERN MD BROADSTREET COMMUNICATIONS, INC. - MD
443-476 ANNAPOLIS MD VERIZON MARYLAND, INC.
443-477 CAMBRIDGE MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-479 WATERLO236 MD VERIZON MARYLAND, INC.
443-480 CHESTERTN MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-481 ANNAPOLIS MD VERIZON MARYLAND, INC.
443-482 ANNAPOLIS MD VERIZON MARYLAND, INC.
443-483 CARDIFF MD BROADWING COMMUNICATIONS. LLC - MD
443-484 EDGEWOOD MD BROADWING COMMUNICATIONS. LLC - MD
443-485 ELKTON MD BROADWING COMMUNICATIONS. LLC - MD
443-486 PRINCEFRCK MD BROADWING COMMUNICATIONS. LLC - MD
443-487 WESTMINSTR MD BROADWING COMMUNICATIONS. LLC - MD
443-488 COLUMBIA MD BROADSTREET COMMUNICATIONS, INC. - MD
443-489 CHASE MD TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD
443-490 EDGEWOOD MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD
443-491 PARKTON MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD
443-492 ELKRIDGE MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD
443-494 MILLERSVL MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD
443-495 PARKVILLE MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD
443-496 EASTON MD NEXTEL COMMUNICATIONS, INC.
443-497 SALISBURY MD NEXTEL COMMUNICATIONS, INC.
443-498 CATONSVL MD ALLEGIANCE TELECOM, INC. - MD
443-499 JARRETTSVL MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD
443-501 PIKESVILLE MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD
443-502 HAVREGRACE MD TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD
443-503 DUNDALK MD XO MARYLAND, LLC
443-504 FALLSTON MD CAVALIER EAST LLC - MD
443-505 ESSEX MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD
443-506 BALTIMORE MD NEXTEL COMMUNICATIONS, INC.
443-507 HAMPSTEAD MD TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD
443-508 HAMPSTEAD MD CAVALIER EAST LLC - MD
443-510 ANNAPOLIS MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-511 MD
443-512 EDGEWOOD MD VERIZON MARYLAND, INC.
443-513 BERLIN MD NEW CINGULAR WIRELESS PCS, LLC - DC
443-514 CATONSVL MD US LEC OF MARYLAND, INC.
443-515 ARBUTUS MD BROADSTREET COMMUNICATIONS, INC. - MD
443-516 SYKESVILLE MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD
443-517 GLENBURNIE MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD
443-519 TOWSON MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD
443-520 CATONSVL MD NEW CINGULAR WIRELESS PCS, LLC - DC
443-521 CAMBRIDGE MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-522 REISTERSTN MD PAETEC COMMUNICATIONS, INC. - MD