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(203)
Enter 7-digit phone number for area code 203 or the complete 10-digit phone number

Phone Prefixes for Area Code 203

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Area code location Company / Service Provider
203-505 NORWALK, CT CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT
203-506 NEW HAVEN, CT NEW CINGULAR WIRELESS PCS, LLC - DC
203-507 NEW HAVEN, CT SPRINT SPECTRUM L.P.
203-508 NEW HAVEN, CT CTC COMMUNICATIONS CORP. - CT
203-509 WATERBURY, CT SPRINT SPECTRUM L.P.
203-510 WATERBURY, CT SPRINT SPECTRUM L.P.
203-512 DANBURY, CT OMNIPOINT COMMUNICATIONS, INC. - CT
203-513 HUNTINGTON, CT AT&T LOCAL
203-514 MERIDEN, CT TELEPORT COMMUNICATIONS AMERICA, LLC - CT
203-515 NORWALK, CT SPRINT SPECTRUM L.P.
203-516 Ansonia / Derby, CT GLOBAL CROSSING LOCAL SERVICES, INC.-CT
203-517 STAMFORD, CT LEVEL 3 COMMUNICATIONS, LLC - CT
203-518 WATERBURY, CT NEW CINGULAR WIRELESS PCS, LLC - DC
203-519 WATERBURY, CT SPRINT SPECTRUM L.P.
203-520 BRIDGEPORT, CT CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT
203-521 BRIDGEPORT, CT CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT
203-522 BRIDGEPORT, CT NEW CINGULAR WIRELESS PCS, LLC - DC
203-523 NORWALK, CT TELEPORT COMMUNICATIONS AMERICA, LLC - CT
203-524 STAMFORD, CT NEW CINGULAR WIRELESS PCS, LLC - DC
203-525 WATERBURY, CT NEW CINGULAR WIRELESS PCS, LLC - DC
203-526 BRIDGEPORT, CT SPRINT SPECTRUM L.P.
203-527 WATERBURY, CT SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT
203-528 WATERBURY, CT LEVEL 3 COMMUNICATIONS, LLC - CT
203-529 WILTON, CT AT&T LOCAL
203-530 NEW HAVEN, CT CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT
203-531 BYRAM, CT VERIZON NEW YORK INC.
203-532 BYRAM, CT VERIZON NEW YORK INC.
203-533 GUILFORD, CT LEVEL 3 COMMUNICATIONS, LLC - CT
203-534 BRIDGEPORT, CT SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT
203-535 NEW HAVEN, CT COMCAST PHONE OF CONNECTICUT, INC. - CT
203-536 STAMFORD, CT CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT
203-537 MERIDEN, CT SPRINT SPECTRUM L.P.
203-538 HUNTINGTON, CT CHOICE ONE COMMUNICATIONS, INC. - CT
203-539 STAMFORD, CT SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT
203-540 BRIDGEPORT, CT NEW CINGULAR WIRELESS PCS, LLC - DC
203-541 STAMFORD, CT SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT
203-542 GREENWICH, CT AT&T LOCAL
203-543 BRIDGEPORT, CT OMNIPOINT COMMUNICATIONS, INC. - CT
203-544 GEORGETOWN, CT SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT
203-545 BRIDGEPORT, CT SPRINT SPECTRUM L.P.
203-546 DANBURY, CT TELEPORT COMMUNICATIONS AMERICA, LLC - CT
203-547 STAMFORD, CT GLOBAL NAPS, INC. - CT
203-548 STAMFORD, CT BROADWING COMMUNICATIONS, LLC - CT
203-549 BRIDGEPORT, CT CHOICE ONE COMMUNICATIONS, INC. - CT
203-550 STAMFORD, CT OMNIPOINT COMMUNICATIONS, INC. - CT
203-551 BRIDGEPORT, CT TELEPORT COMMUNICATIONS AMERICA, LLC - CT
203-552 BYRAM, CT VERIZON NEW YORK INC.
203-553 NEW HAVEN, CT SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT
203-554 STAMFORD, CT NEW CINGULAR WIRELESS PCS, LLC - DC
203-556 BRIDGEPORT, CT NEW CINGULAR WIRELESS PCS, LLC - DC
203 Area Code Information
Type of code: General Purpose Code
location: CT - US
Time zone: E
Assigned for use: Yes
Code in service: Yes
Service date: January 01, 1947
In jeopardy: No
Relief in progress: No
NPA Relief status:
Code assignable: Yes
Geographic or
non-geographic:
G
Reserved for future use: No
Planning letter(s): 388 255 217 138
Overlay code: Yes
Overlay complex: 203/475
Dialing plan Standard Permissive
Home local calls: 10D 1+10D
Foreign local calls: 10D 1+10D
Home toll calls: 1+10D NA
Foreign toll calls: 1+10D -
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