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Area Codes > 443 > Central Office Codes

Exchange Rate Center State Operating Company
443-634 BALTIMORE MD TIDALWAVE TELEPHONE INC.
443-636 CATONSVL MD SBC LONG DISTANCE, LLC DBA AT&T LONG DISTANCE - MD
443-637 ARGRGBSNIS MD XO MARYLAND, LLC
443-638 ELLICOTTCY MD GLOBAL NAPS SOUTH, INC. - MD
443-639 HAMPSTEAD MD GLOBAL NAPS SOUTH, INC. - MD
443-640 BEL AIR MD US LEC OF MARYLAND, INC.
443-641 PIKESVILLE MD BROADWING COMMUNICATIONS. LLC - MD
443-642 BALTIMORE MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-643 BEL AIR MD VERIZON MARYLAND, INC.
443-644 JARRETTSVL MD GLOBAL NAPS SOUTH, INC. - MD
443-645 MILLERSVL MD GLOBAL NAPS SOUTH, INC. - MD
443-646 NORTHBEACH MD GLOBAL NAPS SOUTH, INC. - MD
443-647 NEWWINDSOR MD GLOBAL NAPS SOUTH, INC. - MD
443-648 ESSEX MD TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD
443-649 SPARROWSPT MD US LEC OF MARYLAND, INC.
443-650 REISTERSTN MD ALLEGIANCE TELECOM, INC. - MD
443-652 TOWSON MD VERIZON MARYLAND, INC.
443-653 PARKVILLE MD OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC
443-655 BEL AIR MD NEW CINGULAR WIRELESS PCS, LLC - DC
443-656 COLUMBIA MD CAVALIER EAST LLC - MD
443-657 RANDALLSTN MD XSPEDIUS MANAGEMENT CO SWITCHES SERVICES, LLC - MD
443-658 WOODLAWN MD GLOBAL NAPS SOUTH, INC. - MD
443-659 WEST RIVER MD GLOBAL NAPS SOUTH, INC. - MD
443-660 PIKESVILLE MD COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD
443-661 WATERLO238 MD CAVALIER EAST LLC - MD
443-662 SPARKSGLNC MD CAVALIER EAST LLC - MD
443-663 WOODLAWN MD VERIZON MARYLAND, INC.
443-664 OCEAN CITY MD CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD
443-665 NANTICOKE MD CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD
443-666 PT DEPOSIT MD ARBROS COMMUNICATIONS LICENSING COMPANY, N.E. - MD
443-667 MD
443-668 CATONSVL MD NEW CINGULAR WIRELESS PCS, LLC - DC
443-669 DELMAR MD CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD
443-670 CATONSVL MD CAVALIER EAST LLC - MD
443-671 NEWWINDSOR MD TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD
443-672 PARKTON MD TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD
443-673 BRYNPKLNCM MD CAVALIER EAST LLC - MD
443-674 NORTH EAST MD TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD
443-675 RANDALLSTN MD CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD
443-676 BALTIMORE MD NEW CINGULAR WIRELESS PCS, LLC - DC
443-677 BALTIMORE MD NEXTEL COMMUNICATIONS, INC.
443-678 PARKVILLE MD VERIZON MARYLAND, INC.
443-679 SEVERN MD TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD
443-682 BALTIMORE MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-683 BALTIMORE MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-685 SEVERN MD CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD
443-686 FALLSTON MD NEXTEL COMMUNICATIONS, INC.
443-687 WOODLAWN MD BROADSTREET COMMUNICATIONS, INC. - MD
443-688 SEVERN MD CAVALIER EAST LLC - MD
443-689 COCKEYSVL MD CAVALIER EAST LLC - MD
443-690 BALTIMORE MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-691 BALTIMORE MD NEW CINGULAR WIRELESS PCS, LLC - DC
443-692 BALTIMORE MD ALLEGIANCE TELECOM, INC. - MD
443-693 PERRYVILLE MD TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD
443-694 SEVERNA PK MD SPRINT SPECTRUM L.P.
443-695 BALTIMORE MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-696 DUNDALK MD CAVALIER EAST LLC - MD
443-697 CATONSVL MD GLOBAL NAPS SOUTH, INC. - MD
443-698 ODENTON MD TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD
443-699 PIKESVILLE MD BROADSTREET COMMUNICATIONS, INC. - MD
443-700 MD
443-701 ARBUTUS MD XO MARYLAND, LLC
443-702 ARGRGBSNIS MD CAVALIER EAST LLC - MD
443-703 BALTIMORE MD XO MARYLAND, LLC
443-704 ODENTON MD CAVALIER EAST LLC - MD
443-705 COCKEYSVL MD GLOBAL NAPS SOUTH, INC. - MD
443-706 CRISFIELD MD CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD
443-707 BALTIMORE MD GLOBAL NAPS SOUTH, INC. - MD
443-708 BALTIMORE MD XSPEDIUS MANAGEMENT CO SWITCHES SERVICES, LLC - MD
443-709 ARBUTUS MD CAVALIER TELEPHONE MID-ATLANTIC. LLC - MD
443-710 CATONSVL MD XO MARYLAND, LLC
443-711 MD
443-712 REISTERSTN MD CAVALIER EAST LLC - MD
443-714 COLUMBIA MD TIDALWAVE TELEPHONE INC.
443-715 NORTH EAST MD CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD
443-716 ANNAPOLIS MD CAVALIER EAST LLC - MD
443-717 BALTIMORE MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-718 COLUMBIA MD US LEC OF MARYLAND, INC.
443-719 JARRETTSVL MD CAVALIER EAST LLC - MD
443-720 ELKTON MD TIDALWAVE TELEPHONE INC.
443-722 BALTIMORE MD OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC
443-723 BRYNPKLNCM MD TIDALWAVE TELEPHONE INC.
443-724 EASTON MD CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD
443-725 PARKVILLE MD PAETEC COMMUNICATIONS, INC. - MD
443-726 TOWSON MD TIDALWAVE TELEPHONE INC.
443-727 BISHOPVL MD CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD
443-728 BERLIN MD CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD
443-729 WOODLAWN MD PAETEC COMMUNICATIONS, INC. - MD
443-730 ESSEX MD PAETEC COMMUNICATIONS, INC. - MD
443-731 PT DEPOSIT MD TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD
443-732 SILVER RUN MD TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD
443-733 WATERLO238 MD AT&T LOCAL
443-734 SEVERN MD VERIZON MARYLAND, INC.
443-735 SALISBURY MD NEW CINGULAR WIRELESS PCS, LLC - DC
443-736 SALISBURY MD NEW CINGULAR WIRELESS PCS, LLC - DC
443-737 WATERLO238 MD PAETEC COMMUNICATIONS, INC. - MD
443-738 PIKESVILLE MD PAETEC COMMUNICATIONS, INC. - MD
443-739 BALTIMORE MD OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC
443-740 BALTIMORE MD TELCOVE OPERATIONS, INC. - MD
443-742 BALTIMORE MD NEW CINGULAR WIRELESS PCS, LLC - DC