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 |
| 203-421
| 2 |
Madison |
CT |
HRFRCTCR3MD |
318J COMCAST IP PHONE, LLC |
920 |
|
2014-08-28 |
|
| 203-421
| 3 |
Madison |
CT |
MDSNCT02RS0 |
9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT |
920 |
|
|
|
| 203-421
| 4 |
Madison |
CT |
MDSNCT02RS0 |
9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT |
920 |
|
|
|
| 203-421
| 5 |
Madison |
CT |
MDSNCT02RS0 |
9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT |
920 |
|
|
|
| 203-421
| 6 |
Madison |
CT |
HRFRCTCR3MD |
318J COMCAST IP PHONE, LLC |
920 |
|
2010-09-16 |
|
| 203-421
| 7 |
Madison |
CT |
MDSNCT02RS0 |
9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT |
920 |
|
|
|
| 203-421
| 8 |
Madison |
CT |
MDSNCT02RS0 |
9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT |
920 |
|
|
|
| 203-421
| 9 |
Madison |
CT |
MDSNCT02RS0 |
9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT |
920 |
|
|
|
| 203-422
| A |
Greenwich |
CT |
GNWCCTGNDS0 |
9104 VERIZON NEW YORK, INC. |
132 |
|
|
|
| 203-422
| 0 |
Greenwich |
CT |
GNWCCTGNDS0 |
9104 VERIZON NEW YORK, INC. |
132 |
|
|
|
| 203-422
| 1 |
Greenwich |
CT |
GNWCCTGNX5Y |
4950 CABLEVISION LIGHTPATH, INC. - CT |
132 |
|
2007-11-22 |
|
| 203-422
| 2 |
Greenwich |
CT |
GNWCCTGNDS0 |
9104 VERIZON NEW YORK, INC. |
132 |
|
|
|
| 203-422
| 3 |
Greenwich |
CT |
GNWCCTGNDS0 |
9104 VERIZON NEW YORK, INC. |
132 |
|
|
|
| 203-422
| 4 |
Greenwich |
CT |
GNWCCTGNDS0 |
9104 VERIZON NEW YORK, INC. |
132 |
|
|
|
| 203-422
| 5 |
Greenwich |
CT |
GNWCCTGNDS0 |
9104 VERIZON NEW YORK, INC. |
132 |
|
|
|
| 203-422
| 6 |
Greenwich |
CT |
GNWCCTGNDS0 |
9104 VERIZON NEW YORK, INC. |
132 |
|
|
|
| 203-422
| 7 |
Greenwich |
CT |
GNWCCTGNDS0 |
9104 VERIZON NEW YORK, INC. |
132 |
|
|
|
| 203-422
| 8 |
Greenwich |
CT |
GNWCCTGNDS0 |
9104 VERIZON NEW YORK, INC. |
132 |
|
|
|
| 203-422
| 9 |
Greenwich |
CT |
NYCMNY83D1S |
350E YMAX COMMUNICATIONS CORP. - CT |
132 |
|
2010-10-26 |
|
| 203-423
| A |
Wilton |
CT |
HRFRCTCRDS0 |
7143 TELEPORT COMMUNICATIONS AMERICA, LLC - CT |
920 |
|
|
|
| 203-423
| 0 |
Wilton |
CT |
SMFRCTPU4MD |
4800 LEVEL 3 COMMUNICATIONS, LLC - CT |
920 |
|
2006-01-02 |
|
| 203-423
| 1 |
Wilton |
CT |
NRWLCTCVDS0 |
4950 CABLEVISION LIGHTPATH, INC. - CT |
920 |
|
2007-08-31 |
|
| 203-423
| 2 |
Wilton |
CT |
SMFRCTDSDS0 |
7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT |
920 |
|
2003-06-18 |
|
| 203-423
| 3 |
Wilton |
CT |
HRFRCT0379Z |
199F BANDWIDTH.COM CLEC, LLC - CT |
920 |
|
2010-02-28 |
|
| 203-423
| 4 |
Wilton |
CT |
HRFRCTCRDS0 |
7143 TELEPORT COMMUNICATIONS AMERICA, LLC - CT |
920 |
|
|
|
| 203-423
| 5 |
Wilton |
CT |
SMFRCTPU4MD |
4800 LEVEL 3 COMMUNICATIONS, LLC - CT |
920 |
|
2010-11-23 |
|
| 203-423
| 6 |
Wilton |
CT |
HRFRCTCRDS0 |
7143 TELEPORT COMMUNICATIONS AMERICA, LLC - CT |
920 |
|
|
|
| 203-423
| 7 |
Wilton |
CT |
HRFRCTCRDS0 |
7143 TELEPORT COMMUNICATIONS AMERICA, LLC - CT |
920 |
|
|
|
| 203-423
| 8 |
Wilton |
CT |
SMFRCTDSDS0 |
7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT |
920 |
|
2012-09-04 |
|
| 203-423
| 9 |
Wilton |
CT |
BLFDCTAP2MD |
5562 METROPCS, INC. |
920 |
|
2002-12-23 |
|
| 203-424
| A |
Darien |
CT |
BLFDCTAP2MD |
5562 METROPCS, INC. |
920 |
|
|
|
| 203-424
| 0 |
Darien |
CT |
HRFRCT0379Z |
199F BANDWIDTH.COM CLEC, LLC - CT |
920 |
|
2008-11-29 |
|
| 203-424
| 1 |
Darien |
CT |
HRFRCT0379Z |
199F BANDWIDTH.COM CLEC, LLC - CT |
920 |
|
2010-02-26 |
|
| 203-424
| 2 |
Darien |
CT |
HRFRCT0380Z |
539F PEERLESS NETWORK OF CONNECTICUT, LLC - CT |
920 |
|
2013-05-03 |
|
| 203-424
| 3 |
Darien |
CT |
BLFDCTAP2MD |
5562 METROPCS, INC. |
920 |
|
2011-03-23 |
|
| 203-424
| 4 |
Darien |
CT |
BLFDCTAP2MD |
5562 METROPCS, INC. |
920 |
|
2011-03-23 |
|
| 203-424
| 5 |
Darien |
CT |
NWHNCT02GT0 |
9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT |
920 |
|
2007-09-07 |
|
| 203-424
| 6 |
Darien |
CT |
|
6624 OMNIPOINT COMMUNICATIONS, INC. - CT |
920 |
|
2011-03-23 |
|
| 203-424
| 7 |
Darien |
CT |
BLFDCTAP2MD |
5562 METROPCS, INC. |
920 |
|
2007-09-14 |
|
| 203-424
| 8 |
Darien |
CT |
BLFDCTAP2MD |
5562 METROPCS, INC. |
920 |
|
2007-09-14 |
|
| 203-424
| 9 |
Darien |
CT |
BLFDCTAP2MD |
5562 METROPCS, INC. |
920 |
|
2007-09-14 |
|
| 203-425
| A |
Stamford |
CT |
SMFRCT01DS2 |
9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT |
920 |
|
|
|
| 203-426
| A |
Newtown |
CT |
NWTWCT00DS0 |
9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT |
920 |
|
|
|
| 203-427
| A |
Meriden |
CT |
HRFRCTASDS0 |
7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC |
920 |
|
|
|
| 203-427
| 0 |
Meriden |
CT |
HRFRCT0380Z |
539F PEERLESS NETWORK OF CONNECTICUT, LLC - CT |
920 |
|
2013-05-03 |
|
| 203-427
| 1 |
Meriden |
CT |
MDTWCTNIBMD |
4036 NEW CINGULAR WIRELESS PCS, LLC - DC |
920 |
|
2007-02-12 |
|
| 203-427
| 2 |
Meriden |
CT |
HRFRCTASDS0 |
7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC |
920 |
|
|
|
| 203-427
| 3 |
Meriden |
CT |
MDTWCTNIBMD |
4036 NEW CINGULAR WIRELESS PCS, LLC - DC |
920 |
|
2007-12-14 |
|
| 203-427
| 4 |
Meriden |
CT |
HRFRCTASDS0 |
7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC |
920 |
|
|
|
| 203-427
| 5 |
Meriden |
CT |
MDTWCTNIBMD |
4036 NEW CINGULAR WIRELESS PCS, LLC - DC |
920 |
|
2007-12-14 |
|
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Last updated: Sun, 17 May 2026 03:26:51 UTC
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