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Area Codes > 443 > Central Office Codes

Exchange Rate Center State Operating Company
443-200 WOODLAWN MD ALLEGIANCE TELECOM, INC. - MD
443-203 WEST RIVER MD VERIZON MARYLAND, INC.
443-204 PIKESVILLE MD NEW CINGULAR WIRELESS PCS, LLC - DC
443-205 CAMBRIDGE MD NEXTEL COMMUNICATIONS, INC.
443-206 PERRYVILLE MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-207 ELKTON MD OMNIPOINT COMMUNICATIONS ENTERPRISES, L.P.
443-209 HAVREGRACE MD CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD
443-210 ABERDEEN MD TIDALWAVE TELEPHONE INC.
443-211 MD
443-212 SPARKSGLNC MD US LEC OF MARYLAND, INC.
443-213 PIKESVILLE MD VERIZON MARYLAND, INC.
443-214 ANNAPOLIS MD TIDALWAVE TELEPHONE INC.
443-215 CHESTERTN MD CORE COMMUNICATIONS, INC. - MD
443-216 DUNDALK MD CAVALIER TELEPHONE MID-ATLANTIC. LLC - MD
443-217 ANNAPOLIS MD CORE COMMUNICATIONS, INC. - MD
443-218 WORTHINGTN MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD
443-219 PARKVILLE MD LEVEL 3 COMMUNICATIONS, LLC - MD
443-220 BALTIMORE MD VERIZON MARYLAND, INC.
443-221 ANNAPOLIS MD LEVEL 3 COMMUNICATIONS, LLC - MD
443-222 WORTHINGTN MD GLOBAL NAPS SOUTH, INC. - MD
443-223 ANNAPOLIS MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-224 BALTIMORE MD MCI WORLDCOM COMMUNICATIONS, INC. - MD
443-225 CAMBRIDGE MD NEXTEL COMMUNICATIONS, INC.
443-226 BALTIMORE MD SPRINT SPECTRUM L.P.
443-227 PT DEPOSIT MD GLOBAL NAPS SOUTH, INC. - MD
443-228 CHASE MD US LEC OF MARYLAND, INC.
443-229 SEVERNA PK MD CAVALIER EAST LLC - MD
443-230 ODENTON MD GLOBAL NAPS SOUTH, INC. - MD
443-231 ESSEX MD AT&T LOCAL
443-232 WILLARDS MD CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD
443-233 VIENNA MD CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD
443-234 SNOW HILL MD CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD
443-235 SALISBURY MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-236 CARDIFF MD CORE COMMUNICATIONS, INC. - MD
443-237 NORTHBEACH MD CORE COMMUNICATIONS, INC. - MD
443-238 PARKTON MD GLOBAL NAPS SOUTH, INC. - MD
443-239 EASTON MD NEW CINGULAR WIRELESS PCS, LLC - DC
443-241 WESTMINSTR MD GLOBAL NAPS SOUTH, INC. - MD
443-242 SPARROWSPT MD CAVALIER EAST LLC - MD
443-243 FALLSTON MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-244 WESTMINSTR MD LEVEL 3 COMMUNICATIONS, LLC - MD
443-245 ELKTON MD CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD
443-246 ELKTON MD CORE COMMUNICATIONS, INC. - MD
443-247 UNION BDG MD GLOBAL NAPS SOUTH, INC. - MD
443-248 BALTIMORE MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-249 STEVENSVL MD VERIZON MARYLAND, INC.
443-250 BALTIMORE MD NEXTEL COMMUNICATIONS, INC.
443-252 ELLICOTTCY MD BROADSTREET COMMUNICATIONS, INC. - MD
443-253 BALTIMORE MD NEW CINGULAR WIRELESS PCS, LLC - DC
443-254 ANNAPOLIS MD OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC
443-255 BALTIMORE MD NEW CINGULAR WIRELESS PCS, LLC - DC
443-256 NORTH EAST MD GLOBAL NAPS SOUTH, INC. - MD
443-257 BALTIMORE MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-258 EASTON MD NEW CINGULAR WIRELESS PCS, LLC - DC
443-259 COLUMBIA MD VERIZON MARYLAND, INC.
443-260 SALISBURY MD VERIZON MARYLAND, INC.
443-261 SEVERNA PK MD SBC LONG DISTANCE, LLC DBA AT&T LONG DISTANCE - MD
443-262 CENTREVL MD VERIZON MARYLAND, INC.
443-263 BALTIMORE MD VERIZON MARYLAND, INC.
443-264 PIKESVILLE MD GLOBAL NAPS SOUTH, INC. - MD
443-265 FORK MD CAVALIER EAST LLC - MD
443-266 GLENWOOD MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD
443-267 DARLINGTON MD TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD
443-268 BALTIMORE MD CORE COMMUNICATIONS, INC. - MD
443-269 TOWSON MD GLOBAL NAPS SOUTH, INC. - MD
443-270 GLENBURNIE MD PAETEC COMMUNICATIONS, INC. - MD
443-271 BALTIMORE MD NEXTEL COMMUNICATIONS, INC.
443-272 RANDALLSTN MD TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD
443-273 REISTERSTN MD TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD
443-274 SEVERN MD VERIZON MARYLAND, INC.
443-275 TOWSON MD WINSTAR COMMUNICATIONS, LLC - MD
443-276 COLUMBIA MD ALLEGIANCE TELECOM, INC. - MD
443-277 SYKESVILLE MD NEXTEL COMMUNICATIONS, INC.
443-278 BALTIMORE MD VDL, INC. DBA GLOBAL TELECOM BROKERS - MD
443-279 TOWSON MD ALLEGIANCE TELECOM, INC. - MD
443-280 SYKESVILLE MD NEW CINGULAR WIRELESS PCS, LLC - DC
443-281 COCKEYSVL MD ALLEGIANCE TELECOM, INC. - MD
443-282 CHESTERTN MD NEXTEL COMMUNICATIONS, INC.
443-283 COLUMBIA MD PAETEC COMMUNICATIONS, INC. - MD
443-284 WATERLO238 MD GLOBAL NAPS SOUTH, INC. - MD
443-285 COLUMBIA MD VERIZON MARYLAND, INC.
443-286 BALTIMORE MD CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD
443-287 BALTIMORE MD VERIZON MARYLAND, INC.
443-288 ELLICOTTCY MD ALLEGIANCE TELECOM, INC. - MD
443-289 CATONSVL MD BROADSTREET COMMUNICATIONS, INC. - MD
443-290 PARKVILLE MD XSPEDIUS MANAGEMENT CO SWITCHES SERVICES, LLC - MD
443-291 HAMPSTEAD MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD
443-292 CROFTON MD XSPEDIUS MANAGEMENT CO SWITCHES SERVICES, LLC - MD
443-293 WESTMINSTR MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD
443-294 WEST RIVER MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD
443-295 PRINCEFRCK MD LEVEL 3 COMMUNICATIONS, LLC - MD
443-296 WATERLO238 MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD
443-297 ARBUTUS MD TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD
443-298 EASTON MD NEW CINGULAR WIRELESS PCS, LLC - DC
443-299 FALLSTON MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD
443-300 SYKESVILLE MD BROADWING COMMUNICATIONS. LLC - MD
443-302 CROFTON MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD
443-303 ABERDEEN MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD
443-304 ARBUTUS MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD
443-305 ARGRGBSNIS MD GLOBAL CROSSING LOCAL SERVICES, INC.-MD