Area Code — 443

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Rate centers: WOODLAWN, WEST RIVER, PIKESVILLE, CAMBRIDGE, PERRYVILLE, ELKTON, BALTIMORE, HAVREGRACE, SALISBURY, SPARKSGLNC, ANNAPOLIS, CHESTERTN, DUNDALK, WORTHINGTN, PARKVILLE, PT DEPOSIT, CHASE, SEVERNA PK, ODENTON, ESSEX, WILLARDS, VIENNA, SNOW HILL, CARDIFF, NORTHBEACH, PARKTON, EASTON, WESTMINSTR, SPARROWSPT, FALLSTON, UNION BDG, STEVENSVL, NORTH EAST, COLUMBIA, CENTREVL, FORK, GLENWOOD, DARLINGTON, TOWSON, GLENBURNIE, RANDALLSTN, REISTERSTN, SEVERN, SYKESVILLE, COCKEYSVL, WATERLO238, ELLICOTTCY, HAMPSTEAD, CROFTON, PRINCEFRCK, ARBUTUS, ABERDEEN, ARGRGBSNIS, BEL AIR, BRYNPKLNCM, CATONSVL, SHARPTOWN, WATERLO236, TANEYTOWN, SHERWD FOR, SOLOMONS, MILLERSVL, SILVER RUN, DELMAR, EDGEWOOD, OCEAN CITY, POCOMOKE, CHURCHVL, PRINCEANNE, FEDERALSBG, TRAPPE, ELKRIDGE, QUEENSTOWN, DENTON, JARRETTSVL, BERLIN, CHESAPKECY, NEWWINDSOR, NANTICOKE, CRISFIELD, BISHOPVL

Companies: ALLEGIANCE TELECOM, INC., COMCAST PHONE OF NORTHERN MARYLAND, INC., TELCOVE OPERATIONS, INC., VERIZON MARYLAND, INC., LEVEL 3 COMMUNICATIONS, LLC, XO MARYLAND, LLC, NATIONSLINE, INC., BANDWIDTH.COM CLEC, LLC, NEW CINGULAR WIRELESS PCS, LLC - DC, NEXTEL COMMUNICATIONS, INC., CELLCO PARTNERSHIP DBA VERIZON WIRELESS, CORE COMMUNICATIONS, INC., OMNIPOINT COMMUNICATIONS ENTERPRISES, L.P., SPRINT SPECTRUM L.P., CAVALIER TELEPHONE, LLC (MID-ATLANTIC), LIGHTWAVE COMMUNICATIONS, LLC, MCI WORLDCOM COMMUNICATIONS, INC., US LEC OF MARYLAND, INC., PAETEC COMMUNICATIONS, INC., BROADWING COMMUNICATIONS. LLC, CAVALIER TELEPHONE MID-ATLANTIC, LLC, GLOBAL CROSSING LOCAL SERVICES, INC., OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC, LEAP WIRELESS INTL, INC. DBA CRICKET COMM, INC., GLOBAL NAPS SOUTH, INC., YMAX COMMUNICATIONS CORP., AT&T LOCAL, CTC COMMUNICATIONS CORP., SPRINT COMMUNICATIONS COMPANY, L.P., VDL, INC. DBA GLOBAL TELECOM BROKERS, IDT AMERICA CORP, ATX TELECOMMUNICATIONS SERVICES, LTD, TELEPORT COMMUNICATIONS GROUP AMERICA, INC., TW TELECOM OF MARYLAND LLC, BROADVIEW NETWORKS, INC., ARMSTRONG TELECOMMUNICATIONS, INC., MCIMETRO ACCESS TRANSMISSION SERVICES LLC, NEUTRAL TANDEM-MARYLAND, LLC, QUANTUM TELECOMMUNICATIONS, INC., MCC TELEPHONY OF THE MID-ATLANTIC, LLC, BALTIMORE-WASHINGTON TELEPHONE BWT, GLOBAL NAPS, INC. - NY, INFOTELECOM, LLC, GLOBAL NAPS, INC.-MA, METRO PCS, INC.

List of 443 Area-Code Phone Number Prefixes

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