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Area Codes > 443 > Central Office Codes

Exchange Rate Center State Operating Company
443-743 BALTIMORE MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-744 REISTERSTN MD NEXTEL COMMUNICATIONS, INC.
443-745 COLUMBIA MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-746 EASTON MD LEVEL 3 COMMUNICATIONS, LLC - MD
443-747 PT DEPOSIT MD CORE COMMUNICATIONS, INC. - MD
443-748 MILLERSVL MD CAVALIER EAST LLC - MD
443-749 GLENBURNIE MD CAVALIER TELEPHONE MID-ATLANTIC. LLC - MD
443-750 TOWSON MD BROADSTREET COMMUNICATIONS, INC. - MD
443-751 WOODLAWN MD CAVALIER EAST LLC - MD
443-752 BEL AIR MD GLOBAL NAPS, INC. - NY
443-753 WATERLO236 MD ALLEGIANCE TELECOM, INC. - MD
443-755 WATERLO238 MD VERIZON MARYLAND, INC.
443-756 BALTIMORE MD NEW CINGULAR WIRELESS PCS, LLC - DC
443-757 ELKRIDGE MD CAVALIER EAST LLC - MD
443-758 ANNAPOLIS MD AT&T LOCAL
443-759 BALTIMORE MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-760 ABERDEEN MD AT&T LOCAL
443-761 TOWSON MD OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC
443-762 BALTIMORE MD SPRINT SPECTRUM L.P.
443-763 GLENBURNIE MD WINSTAR COMMUNICATIONS, LLC - MD
443-765 CATONSVL MD NEW CINGULAR WIRELESS PCS, LLC - DC
443-766 COLUMBIA MD US LEC OF MARYLAND, INC.
443-767 WORTHINGTN MD CAVALIER EAST LLC - MD
443-768 BALTIMORE MD SPRINT SPECTRUM L.P.
443-770 ARGRGBSNIS MD VERIZON MARYLAND, INC.
443-772 ESSEX MD CAVALIER TELEPHONE MID-ATLANTIC. LLC - MD
443-773 BRYNPKLNCM MD ALLEGIANCE TELECOM, INC. - MD
443-774 BALTIMORE MD GLOBAL NAPS SOUTH, INC. - MD
443-775 BALTIMORE MD GLOBAL NAPS SOUTH, INC. - MD
443-776 BALTIMORE MD GLOBAL NAPS SOUTH, INC. - MD
443-777 ESSEX MD VERIZON MARYLAND, INC.
443-778 WATERLO236 MD VERIZON MARYLAND, INC.
443-779 ABERDEEN MD GLOBAL NAPS, INC. - NY
443-780 WOODLAWN MD US LEC OF MARYLAND, INC.
443-781 ARGRGBSNIS MD GLOBAL NAPS SOUTH, INC. - MD
443-782 ANNAPOLIS MD GLOBAL NAPS SOUTH, INC. - MD
443-783 SALISBURY MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-784 ARGRGBSNIS MD TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD
443-785 ARBUTUS MD GLOBAL NAPS SOUTH, INC. - MD
443-786 EASTON MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-787 BEL AIR MD GLOBAL NAPS SOUTH, INC. - MD
443-788 ABERDEEN MD GLOBAL NAPS SOUTH, INC. - MD
443-789 WESTMINSTR MD NEW CINGULAR WIRELESS PCS, LLC - DC
443-790 GLENBURNIE MD NEXTEL COMMUNICATIONS, INC.
443-791 TOWSON MD NEW CINGULAR WIRELESS PCS, LLC - DC
443-792 BRYNPKLNCM MD VERIZON MARYLAND, INC.
443-793 PARKVILLE MD XO MARYLAND, LLC
443-794 BALTIMORE MD NEW CINGULAR WIRELESS PCS, LLC - DC
443-795 SEVERN MD XO MARYLAND, LLC
443-796 PIKESVILLE MD XO MARYLAND, LLC
443-797 TOWSON MD XO MARYLAND, LLC
443-798 TOWSON MD XSPEDIUS MANAGEMENT CO SWITCHES SERVICES, LLC - MD
443-799 BALTIMORE MD NEW CINGULAR WIRELESS PCS, LLC - DC
443-801 BALTIMORE MD SPRINT SPECTRUM L.P.
443-802 BALTIMORE MD SPRINT SPECTRUM L.P.
443-803 BALTIMORE MD SPRINT SPECTRUM L.P.
443-804 BALTIMORE MD SPRINT SPECTRUM L.P.
443-806 BALTIMORE MD NEXTEL COMMUNICATIONS, INC.
443-807 FALLSTON MD NEXTEL COMMUNICATIONS, INC.
443-808 BALTIMORE MD GLOBAL NAPS SOUTH, INC. - MD
443-809 BALTIMORE MD GLOBAL NAPS SOUTH, INC. - MD
443-811 MD
443-812 COLUMBIA MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-813 BALTIMORE MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-815 ESSEX MD XO MARYLAND, LLC
443-816 SEVERNA PK MD ALLEGIANCE TELECOM, INC. - MD
443-817 ARGRGBSNIS MD ALLEGIANCE TELECOM, INC. - MD
443-818 ARGRGBSNIS MD LEVEL 3 COMMUNICATIONS, LLC - MD
443-819 BALTIMORE MD GLOBAL NAPS SOUTH, INC. - MD
443-820 ELKRIDGE MD PAETEC COMMUNICATIONS, INC. - MD
443-822 ANNAPOLIS MD SPRINT SPECTRUM L.P.
443-823 TOWSON MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-824 TOWSON MD OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC
443-825 BALTIMORE MD OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC
443-827 BALTIMORE MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-828 ELLICOTTCY MD CAVALIER EAST LLC - MD
443-829 BALTIMORE MD NEXTEL COMMUNICATIONS, INC.
443-830 CATONSVL MD CAVALIER TELEPHONE MID-ATLANTIC. LLC - MD
443-831 BALTIMORE MD NEW CINGULAR WIRELESS PCS, LLC - DC
443-832 COLUMBIA MD LEVEL 3 COMMUNICATIONS, LLC - MD
443-833 ARBUTUS MD SBC LONG DISTANCE, LLC DBA AT&T LONG DISTANCE - MD
443-834 TOWSON MD CAVALIER TELEPHONE MID-ATLANTIC. LLC - MD
443-836 BALTIMORE MD GLOBAL NAPS SOUTH, INC. - MD
443-837 ANNAPOLIS MD US LEC OF MARYLAND, INC.
443-838 BALTIMORE MD NEW CINGULAR WIRELESS PCS, LLC - DC
443-839 BALTIMORE MD OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC
443-840 CATONSVL MD NEW CINGULAR WIRELESS PCS, LLC - DC
443-841 TOWSON MD VERIZON MARYLAND, INC.
443-843 HAVREGRACE MD VERIZON MARYLAND, INC.
443-844 BALTIMORE MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-845 BALTIMORE MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-846 TOWSON MD SBC LONG DISTANCE, LLC DBA AT&T LONG DISTANCE - MD
443-847 TOWSON MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-848 GLENBURNIE MD SBC LONG DISTANCE, LLC DBA AT&T LONG DISTANCE - MD
443-849 TOWSON MD VERIZON MARYLAND, INC.
443-850 BALTIMORE MD OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC
443-851 CATONSVL MD OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC
443-852 ANNAPOLIS MD NEW CINGULAR WIRELESS PCS, LLC - DC
443-854 BALTIMORE MD OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC
443-855 ABERDEEN MD LIGHTWAVE COMMUNICATIONS, LLC - MD