Local Calling Guide
Area code/prefix search
NPA: 203
[Rate centres in NPA 203]
[Dial plan for NPA 203]
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| NPA-NXX |
BLOCK |
Rate Centre |
Region |
Switch |
OCN |
LATA |
LIR |
Eff date |
Disc date |
| 203-303
| 7 |
Wallingford |
CT |
SMFRCTPU4MD |
4800 LEVEL 3 COMMUNICATIONS, LLC - CT |
920 |
|
2006-06-30 |
|
| 203-303
| 8 |
Wallingford |
CT |
SMFRCTPU4MD |
4800 LEVEL 3 COMMUNICATIONS, LLC - CT |
920 |
|
2005-01-10 |
|
| 203-303
| 9 |
Wallingford |
CT |
HRFRCT03HMD |
073H TELNYX LLC |
920 |
|
2018-05-02 |
|
| 203-304
| A |
Newtown |
CT |
HRFRCTCRDS0 |
7143 TELEPORT COMMUNICATIONS AMERICA, LLC - CT |
920 |
|
|
|
| 203-304
| 0 |
Newtown |
CT |
HRFRCTCRDS0 |
7143 TELEPORT COMMUNICATIONS AMERICA, LLC - CT |
920 |
|
|
|
| 203-304
| 1 |
Newtown |
CT |
WLMNCT132MD |
792K CHARTER IP ENABLED SERVICES, LLC |
920 |
|
2005-01-17 |
|
| 203-304
| 2 |
Newtown |
CT |
|
829J PAETEC ITEL, LLC |
920 |
|
2004-10-15 |
|
| 203-304
| 3 |
Newtown |
CT |
HRFRCTCRDS0 |
7143 TELEPORT COMMUNICATIONS AMERICA, LLC - CT |
920 |
|
|
|
| 203-304
| 4 |
Newtown |
CT |
|
829J PAETEC ITEL, LLC |
920 |
|
2006-04-13 |
|
| 203-304
| 5 |
Newtown |
CT |
|
829J PAETEC ITEL, LLC |
920 |
|
2007-05-11 |
|
| 203-304
| 6 |
Newtown |
CT |
SMFRCTPU4MD |
4800 LEVEL 3 COMMUNICATIONS, LLC - CT |
920 |
|
2008-05-16 |
|
| 203-304
| 7 |
Newtown |
CT |
SMFRCTPU4MD |
4800 LEVEL 3 COMMUNICATIONS, LLC - CT |
920 |
|
2005-12-19 |
|
| 203-304
| 8 |
Newtown |
CT |
NWHNCT02GT0 |
9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT |
920 |
|
2007-09-07 |
|
| 203-304
| 9 |
Newtown |
CT |
WLMNCT132MD |
792K CHARTER IP ENABLED SERVICES, LLC |
920 |
|
2007-12-09 |
|
| 203-305
| A |
Ansonia-Derby |
CT |
MDTWCTNIBMD |
4036 NEW CINGULAR WIRELESS PCS, LLC - DC |
920 |
|
|
|
| 203-306
| A |
Milford |
CT |
|
829J PAETEC ITEL, LLC |
920 |
|
|
|
| 203-306
| 0 |
Milford |
CT |
|
829J PAETEC ITEL, LLC |
920 |
|
|
|
| 203-306
| 1 |
Milford |
CT |
|
829J PAETEC ITEL, LLC |
920 |
|
|
|
| 203-306
| 2 |
Milford |
CT |
|
829J PAETEC ITEL, LLC |
920 |
|
|
|
| 203-306
| 3 |
Milford |
CT |
|
829J PAETEC ITEL, LLC |
920 |
|
|
|
| 203-306
| 4 |
Milford |
CT |
|
829J PAETEC ITEL, LLC |
920 |
|
|
|
| 203-306
| 5 |
Milford |
CT |
HRFRCTASDS0 |
7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC |
920 |
|
2004-08-27 |
|
| 203-306
| 6 |
Milford |
CT |
BLFDCTAP2MD |
5562 METROPCS, INC. |
920 |
|
2008-10-16 |
|
| 203-306
| 7 |
Milford |
CT |
BLFDCTAP2MD |
5562 METROPCS, INC. |
920 |
|
2004-02-09 |
|
| 203-306
| 8 |
Milford |
CT |
BLFDCTAP2MD |
5562 METROPCS, INC. |
920 |
|
2002-12-30 |
|
| 203-306
| 9 |
Milford |
CT |
BLFDCTAP2MD |
5562 METROPCS, INC. |
920 |
|
2005-12-29 |
|
| 203-307
| A |
Fairfield |
CT |
SMFRCTDSDS0 |
7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT |
920 |
|
|
|
| 203-307
| 0 |
Fairfield |
CT |
HRFRCT0379Z |
199F BANDWIDTH.COM CLEC, LLC - CT |
920 |
|
2011-05-27 |
|
| 203-307
| 1 |
Fairfield |
CT |
SMFRCTPU4MD |
4800 LEVEL 3 COMMUNICATIONS, LLC - CT |
920 |
|
2005-12-19 |
|
| 203-307
| 2 |
Fairfield |
CT |
SMFRCTPU4MD |
4800 LEVEL 3 COMMUNICATIONS, LLC - CT |
920 |
|
2005-12-19 |
|
| 203-307
| 3 |
Fairfield |
CT |
|
829J PAETEC ITEL, LLC |
920 |
|
2005-12-19 |
|
| 203-307
| 4 |
Fairfield |
CT |
|
829J PAETEC ITEL, LLC |
920 |
|
2006-09-21 |
|
| 203-307
| 5 |
Fairfield |
CT |
HRFRCT0379Z |
199F BANDWIDTH.COM CLEC, LLC - CT |
920 |
|
2010-03-05 |
|
| 203-307
| 6 |
Fairfield |
CT |
SMFRCTDSDS0 |
7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT |
920 |
|
2005-03-24 |
|
| 203-307
| 7 |
Fairfield |
CT |
SMFRCTDSDS0 |
7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT |
920 |
|
2005-03-24 |
|
| 203-307
| 8 |
Fairfield |
CT |
SMFRCTDSDS0 |
7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT |
920 |
|
2005-03-24 |
|
| 203-307
| 9 |
Fairfield |
CT |
SMFRCTDSDS0 |
7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT |
920 |
|
2005-03-24 |
|
| 203-308
| A |
Ansonia-Derby |
CT |
HRFRCTASBMD |
6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT |
920 |
|
|
|
| 203-308
| 0 |
Ansonia-Derby |
CT |
HRFRCTASBMD |
6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT |
920 |
|
2008-12-28 |
|
| 203-308
| 1 |
Ansonia-Derby |
CT |
BLFDCTAP2MD |
6624 OMNIPOINT COMMUNICATIONS, INC. - CT |
920 |
|
2009-04-11 |
|
| 203-308
| 2 |
Ansonia-Derby |
CT |
HRFRCTCR3MD |
318J COMCAST IP PHONE, LLC |
920 |
|
2010-08-08 |
|
| 203-308
| 3 |
Ansonia-Derby |
CT |
MDTWCTNIBMD |
4036 NEW CINGULAR WIRELESS PCS, LLC - DC |
920 |
|
2009-07-28 |
|
| 203-308
| 4 |
Ansonia-Derby |
CT |
|
829J PAETEC ITEL, LLC |
920 |
|
2009-10-29 |
|
| 203-308
| 5 |
Ansonia-Derby |
CT |
HRFRCT0379Z |
199F BANDWIDTH.COM CLEC, LLC - CT |
920 |
|
2010-09-09 |
|
| 203-308
| 6 |
Ansonia-Derby |
CT |
MDTWCTNIBMD |
4036 NEW CINGULAR WIRELESS PCS, LLC - DC |
920 |
|
2010-09-09 |
|
| 203-308
| 7 |
Ansonia-Derby |
CT |
BLFDCTAP2MD |
6624 OMNIPOINT COMMUNICATIONS, INC. - CT |
920 |
|
2010-08-07 |
|
| 203-308
| 8 |
Ansonia-Derby |
CT |
BLFDCTAP2MD |
6624 OMNIPOINT COMMUNICATIONS, INC. - CT |
920 |
|
2010-04-01 |
|
| 203-308
| 9 |
Ansonia-Derby |
CT |
BLFDCTAP2MD |
6624 OMNIPOINT COMMUNICATIONS, INC. - CT |
920 |
|
2010-01-21 |
|
| 203-309
| A |
Darien |
CT |
BLFDCTAP2MD |
5562 METROPCS, INC. |
920 |
|
|
|
| 203-309
| 0 |
Darien |
CT |
SMFRCTPU4MD |
4800 LEVEL 3 COMMUNICATIONS, LLC - CT |
920 |
|
2008-03-10 |
|
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Last updated: Sun, 17 May 2026 03:26:51 UTC
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