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Area Codes > 443 > Central Office Codes

Exchange Rate Center State Operating Company
443-523 SALISBURY MD VERIZON MARYLAND, INC.
443-524 BALTIMORE MD ALLEGIANCE TELECOM, INC. - MD
443-526 HAVREGRACE MD GLOBAL NAPS SOUTH, INC. - MD
443-527 BALTIMORE MD OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC
443-528 BEL AIR MD SPRINT SPECTRUM L.P.
443-530 DUNDALK MD PAETEC COMMUNICATIONS, INC. - MD
443-532 PRINCEFRCK MD NEXTEL COMMUNICATIONS, INC.
443-533 JARRETTSVL MD TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD
443-534 ANNAPOLIS MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-535 COLUMBIA MD VERIZON MARYLAND, INC.
443-536 WESTMINSTR MD SPRINT SPECTRUM L.P.
443-538 COLUMBIA MD OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC
443-539 COLUMBIA MD US LEC OF MARYLAND, INC.
443-540 BALTIMORE MD NEW CINGULAR WIRELESS PCS, LLC - DC
443-541 COCKEYSVL MD PAETEC COMMUNICATIONS, INC. - MD
443-542 COLUMBIA MD COMCAST BUSINESS COMMUNICATIONS, INC. - MD
443-543 ARBUTUS MD VERIZON MARYLAND, INC.
443-544 PIKESVILLE MD CAVALIER EAST LLC - MD
443-545 COLUMBIA MD BROADWING COMMUNICATIONS. LLC - MD
443-546 COLUMBIA MD VERIZON MARYLAND, INC.
443-548 PIKESVILLE MD ALLEGIANCE TELECOM, INC. - MD
443-549 DUNDALK MD US LEC OF MARYLAND, INC.
443-550 NORTHBEACH MD CAVALIER TELEPHONE MID-ATLANTIC. LLC - MD
443-551 WOODLAWN MD LEVEL 3 COMMUNICATIONS, LLC - MD
443-552 BALTIMORE MD VERIZON MARYLAND, INC.
443-553 ELKTON MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-554 CHASE MD OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC
443-555 BALTIMORE MD VERIZON MARYLAND, INC.
443-556 COCKEYSVL MD VERIZON MARYLAND, INC.
443-557 GLENBURNIE MD ALLEGIANCE TELECOM, INC. - MD
443-558 ABERDEEN MD XO MARYLAND, LLC
443-559 ESSEX MD COMCAST BUSINESS COMMUNICATIONS, INC. - MD
443-560 ESSEX MD BROADSTREET COMMUNICATIONS, INC. - MD
443-561 ELKRIDGE MD US LEC OF MARYLAND, INC.
443-562 BALTIMORE MD NEW CINGULAR WIRELESS PCS, LLC - DC
443-563 BALTIMORE MD NEXTEL COMMUNICATIONS, INC.
443-564 TOWSON MD LEVEL 3 COMMUNICATIONS, LLC - MD
443-565 RANDALLSTN MD CAVALIER EAST LLC - MD
443-566 CHESAPKECY MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-567 BEL AIR MD LEVEL 3 COMMUNICATIONS, LLC - MD
443-568 ARBUTUS MD ALLEGIANCE TELECOM, INC. - MD
443-569 ANNAPOLIS MD LEVEL 3 COMMUNICATIONS, LLC - MD
443-570 BALTIMORE MD OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC
443-572 GLENBURNIE MD VERIZON MARYLAND, INC.
443-573 BALTIMORE MD US LEC OF MARYLAND, INC.
443-574 ELLICOTTCY MD US LEC OF MARYLAND, INC.
443-575 ARBUTUS MD CAVALIER EAST LLC - MD
443-576 RANDALLSTN MD ALLEGIANCE TELECOM, INC. - MD
443-577 GLENBURNIE MD US LEC OF MARYLAND, INC.
443-578 COCKEYSVL MD XO MARYLAND, LLC
443-579 ESSEX MD US LEC OF MARYLAND, INC.
443-581 CHASE MD GLOBAL NAPS SOUTH, INC. - MD
443-582 CHURCHVL MD GLOBAL NAPS SOUTH, INC. - MD
443-583 COLUMBIA MD GLOBAL NAPS SOUTH, INC. - MD
443-584 CROFTON MD GLOBAL NAPS SOUTH, INC. - MD
443-585 DARLINGTON MD GLOBAL NAPS SOUTH, INC. - MD
443-586 DUNDALK MD GLOBAL NAPS SOUTH, INC. - MD
443-587 EDGEWOOD MD GLOBAL NAPS SOUTH, INC. - MD
443-588 PARKVILLE MD ALLEGIANCE TELECOM, INC. - MD
443-589 COCKEYSVL MD US LEC OF MARYLAND, INC.
443-590 REISTERSTN MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD
443-592 ELKRIDGE MD GLOBAL NAPS SOUTH, INC. - MD
443-593 ELKTON MD GLOBAL NAPS SOUTH, INC. - MD
443-594 SPARROWSPT MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD
443-595 SPARKSGLNC MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD
443-596 ESSEX MD GLOBAL NAPS SOUTH, INC. - MD
443-597 SEVERNA PK MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD
443-598 SHERWD FOR MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD
443-599 SEVERN MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD
443-600 ESSEX MD OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC
443-601 FALLSTON MD GLOBAL NAPS SOUTH, INC. - MD
443-602 BALTIMORE MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-603 ANNAPOLIS MD PAETEC COMMUNICATIONS, INC. - MD
443-604 BALTIMORE MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-605 WESTMINSTR MD CAVALIER EAST LLC - MD
443-606 FORK MD GLOBAL NAPS SOUTH, INC. - MD
443-607 WEST RIVER MD CAVALIER EAST LLC - MD
443-609 SYKESVILLE MD CAVALIER EAST LLC - MD
443-610 BALTIMORE MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-611 MD
443-612 CATONSVL MD VERIZON MARYLAND, INC.
443-614 SALISBURY MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-615 BALTIMORE MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-616 BEL AIR MD CAVALIER EAST LLC - MD
443-617 FALLSTON MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-618 GLENBURNIE MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-620 WATERLO238 MD TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD
443-621 BALTIMORE MD SPRINT SPECTRUM L.P.
443-622 BALTIMORE MD SPRINT SPECTRUM L.P.
443-623 GLENBURNIE MD NEXTEL COMMUNICATIONS, INC.
443-624 PRINCEFRCK MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-625 FORK MD BROADWING COMMUNICATIONS. LLC - MD
443-626 CHASE MD CAVALIER EAST LLC - MD
443-627 BALTIMORE MD VERIZON MARYLAND, INC.
443-628 GLENBURNIE MD GLOBAL NAPS SOUTH, INC. - MD
443-629 BALTIMORE MD SPRINT SPECTRUM L.P.
443-630 BALTIMORE MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-631 CATONSVL MD NEW CINGULAR WIRELESS PCS, LLC - DC
443-632 TOWSON MD US LEC OF MARYLAND, INC.
443-633 WATERLO238 MD BROADSTREET COMMUNICATIONS, INC. - MD