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Area Codes > 443 > Central Office Codes

Exchange Rate Center State Operating Company
443-856 OCEAN CITY MD CORE COMMUNICATIONS, INC. - MD
443-857 BALTIMORE MD OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC
443-858 BALTIMORE MD OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC
443-859 SALISBURY MD OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC
443-860 CATONSVL MD NEW CINGULAR WIRELESS PCS, LLC - DC
443-862 DUNDALK MD BROADSTREET COMMUNICATIONS, INC. - MD
443-864 COLUMBIA MD NEXTEL COMMUNICATIONS, INC.
443-865 BALTIMORE MD NEXTEL COMMUNICATIONS, INC.
443-866 BEL AIR MD SPRINT SPECTRUM L.P.
443-867 GLENBURNIE MD PAETEC COMMUNICATIONS, INC. - MD
443-868 ESSEX MD VERIZON MARYLAND, INC.
443-869 BALTIMORE MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-870 PIKESVILLE MD XSPEDIUS MANAGEMENT CO SWITCHES SERVICES, LLC - MD
443-871 ANNAPOLIS MD NEXTEL COMMUNICATIONS, INC.
443-872 BALTIMORE MD SBC LONG DISTANCE, LLC DBA AT&T LONG DISTANCE - MD
443-874 BALTIMORE MD CAVALIER TELEPHONE MID-ATLANTIC. LLC - MD
443-875 ANNAPOLIS MD SBC LONG DISTANCE, LLC DBA AT&T LONG DISTANCE - MD
443-876 BEL AIR MD SBC LONG DISTANCE, LLC DBA AT&T LONG DISTANCE - MD
443-877 NORTH EAST MD LEVEL 3 COMMUNICATIONS, LLC - MD
443-878 COLUMBIA MD SBC LONG DISTANCE, LLC DBA AT&T LONG DISTANCE - MD
443-879 DUNDALK MD SBC LONG DISTANCE, LLC DBA AT&T LONG DISTANCE - MD
443-880 SALISBURY MD AT&T LOCAL
443-881 REISTERSTN MD NEXTEL COMMUNICATIONS, INC.
443-883 GLENBURNIE MD AT&T LOCAL
443-884 BALTIMORE MD BROADSTREET COMMUNICATIONS, INC. - MD
443-885 BALTIMORE MD VERIZON MARYLAND, INC.
443-886 COCKEYSVL MD AT&T LOCAL
443-889 GLENBURNIE MD OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC
443-891 GLENBURNIE MD XO MARYLAND, LLC
443-893 WOODLAWN MD XO MARYLAND, LLC
443-895 TOWSON MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-896 COLUMBIA MD AT&T LOCAL
443-898 PIKESVILLE MD LEVEL 3 COMMUNICATIONS, LLC - MD
443-899 WATERLO238 MD BROADWING COMMUNICATIONS. LLC - MD
443-900 MD
443-901 TOWSON MD CAVALIER TELEPHONE MID-ATLANTIC. LLC - MD
443-904 BALTIMORE MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-907 ELKTON MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-909 BALTIMORE MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-910 BEL AIR MD NEW CINGULAR WIRELESS PCS, LLC - DC
443-911 MD
443-912 TOWSON MD CORE COMMUNICATIONS, INC. - MD
443-914 WORTHINGTN MD TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD
443-918 TANEYTOWN MD TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD
443-919 BALTIMORE MD CAVALIER TELEPHONE MID-ATLANTIC. LLC - MD
443-920 SYKESVILLE MD TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD
443-921 TOWSON MD PAETEC COMMUNICATIONS, INC. - MD
443-922 EDGEWOOD MD ATX TELECOMMUNICATIONS SERVICES, LTD
443-923 BALTIMORE MD CAVALIER EAST LLC - MD
443-925 BALTIMORE MD OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC
443-926 ANNAPOLIS MD BROADWING COMMUNICATIONS. LLC - MD
443-927 BALTIMORE MD BROADWING COMMUNICATIONS. LLC - MD
443-928 BALTIMORE MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-929 PIKESVILLE MD OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC
443-933 COCKEYSVL MD TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD
443-934 BALTIMORE MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-935 TOWSON MD NEW CINGULAR WIRELESS PCS, LLC - DC
443-936 BALTIMORE MD VERIZON MARYLAND, INC.
443-937 UNION BDG MD TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD
443-938 BALTIMORE MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-939 BALTIMORE MD OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC
443-940 PIKESVILLE MD CAVALIER TELEPHONE MID-ATLANTIC. LLC - MD
443-941 BALTIMORE MD TELCOVE OPERATIONS, INC. - MD
443-942 SEVERNA PK MD TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD
443-943 SPARROWSPT MD TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD
443-944 SALISBURY MD COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD
443-945 ELKTON MD NEW CINGULAR WIRELESS PCS, LLC - DC
443-946 PARKVILLE MD GLOBAL NAPS SOUTH, INC. - MD
443-947 PERRYVILLE MD GLOBAL NAPS SOUTH, INC. - MD
443-949 ANNAPOLIS MD COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD
443-950 MD
443-951 ANNAPOLIS MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD
443-954 BALTIMORE MD PAETEC COMMUNICATIONS, INC. - MD
443-955 BALTIMORE MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-956 BALTIMORE MD NEW CINGULAR WIRELESS PCS, LLC - DC
443-957 BALTIMORE MD AT&T LOCAL
443-958 MD
443-959 MD
443-962 GLENBURNIE MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-964 NORTHBEACH MD LEVEL 3 COMMUNICATIONS, LLC - MD
443-965 BALTIMORE MD NEXTEL COMMUNICATIONS, INC.
443-966 FALLSTON MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-967 NORTH EAST MD VERIZON MARYLAND, INC.
443-968 PRINCEFRCK MD NEW CINGULAR WIRELESS PCS, LLC - DC
443-969 ESSEX MD CAVALIER EAST LLC - MD
443-971 COCKEYSVL MD BROADSTREET COMMUNICATIONS, INC. - MD
443-973 ELLICOTTCY MD XO MARYLAND, LLC
443-974 WESTMINSTR MD TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD
443-975 PRINCEFRCK MD NEW CINGULAR WIRELESS PCS, LLC - DC
443-976 CROFTON MD BALTIMORE-WASHINGTON TELEPHONE BWT
443-977 BALTIMORE MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-980 CATONSVL MD NEW CINGULAR WIRELESS PCS, LLC - DC
443-982 BALTIMORE MD YMAX COMMUNICATIONS CORP. - MD
443-983 BALTIMORE MD OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC
443-984 BALTIMORE MD VERIZON MARYLAND, INC.
443-985 RANDALLSTN MD OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC
443-986 BALTIMORE MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-987 BEL AIR MD AT&T LOCAL
443-988 CENTREVL MD LEVEL 3 COMMUNICATIONS, LLC - MD
443-989 GLENBURNIE MD CAVALIER EAST LLC - MD