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 |
| 203-635
| 1 |
Westport |
CT |
|
829J PAETEC ITEL, LLC |
920 |
|
2005-06-06 |
|
| 203-635
| 2 |
Westport |
CT |
HRFRCT0379Z |
199F BANDWIDTH.COM CLEC, LLC - CT |
920 |
|
2014-11-13 |
|
| 203-635
| 3 |
Westport |
CT |
MDTWCTNIBMD |
4036 NEW CINGULAR WIRELESS PCS, LLC - DC |
920 |
|
2011-08-29 |
|
| 203-635
| 4 |
Westport |
CT |
SMFRCTPU4MD |
4800 LEVEL 3 COMMUNICATIONS, LLC - CT |
920 |
|
|
|
| 203-635
| 5 |
Westport |
CT |
SMFRCTPU4MD |
4800 LEVEL 3 COMMUNICATIONS, LLC - CT |
920 |
|
2012-08-26 |
|
| 203-635
| 6 |
Westport |
CT |
SMFRCTPU4MD |
4800 LEVEL 3 COMMUNICATIONS, LLC - CT |
920 |
|
2012-03-03 |
|
| 203-635
| 7 |
Westport |
CT |
HRFRCT0379Z |
199F BANDWIDTH.COM CLEC, LLC - CT |
920 |
|
2014-11-13 |
|
| 203-635
| 8 |
Westport |
CT |
HRFRCT0380Z |
539F PEERLESS NETWORK OF CONNECTICUT, LLC - CT |
920 |
|
2013-05-04 |
|
| 203-635
| 9 |
Westport |
CT |
HRFRCT0380Z |
539F PEERLESS NETWORK OF CONNECTICUT, LLC - CT |
920 |
|
2013-05-04 |
|
| 203-636
| A |
Darien |
CT |
SMFRCTDSDS0 |
7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT |
920 |
|
|
|
| 203-636
| 0 |
Darien |
CT |
SMFRCTPU4MD |
4800 LEVEL 3 COMMUNICATIONS, LLC - CT |
920 |
|
2004-11-11 |
|
| 203-636
| 1 |
Darien |
CT |
SMFRCTDSDS0 |
7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT |
920 |
|
2005-02-04 |
|
| 203-636
| 2 |
Darien |
CT |
SMFRCTDSDS0 |
7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT |
920 |
|
2005-02-04 |
|
| 203-636
| 3 |
Darien |
CT |
SMFRCTDSDS0 |
7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT |
920 |
|
2005-02-04 |
|
| 203-636
| 4 |
Darien |
CT |
SMFRCTDSDS0 |
7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT |
920 |
|
2005-02-04 |
|
| 203-636
| 5 |
Darien |
CT |
SMFRCTDSDS0 |
7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT |
920 |
|
2005-02-04 |
|
| 203-636
| 6 |
Darien |
CT |
SMFRCTDSDS0 |
7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT |
920 |
|
2005-02-04 |
|
| 203-636
| 7 |
Darien |
CT |
SMFRCTDSDS0 |
7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT |
920 |
|
2005-02-04 |
|
| 203-636
| 8 |
Darien |
CT |
SMFRCTDSDS0 |
7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT |
920 |
|
2004-11-05 |
|
| 203-636
| 9 |
Darien |
CT |
SMFRCTDSDS0 |
7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT |
920 |
|
2004-11-05 |
|
| 203-637
| A |
Old Greenwich |
CT |
OGNWCT00RS1 |
9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT |
920 |
|
|
|
| 203-638
| A |
Trumbull |
CT |
|
829J PAETEC ITEL, LLC |
920 |
|
|
|
| 203-638
| 0 |
Trumbull |
CT |
|
829J PAETEC ITEL, LLC |
920 |
|
|
|
| 203-638
| 1 |
Trumbull |
CT |
|
829J PAETEC ITEL, LLC |
920 |
|
|
|
| 203-638
| 2 |
Trumbull |
CT |
|
829J PAETEC ITEL, LLC |
920 |
|
|
|
| 203-638
| 3 |
Trumbull |
CT |
|
829J PAETEC ITEL, LLC |
920 |
|
|
|
| 203-638
| 4 |
Trumbull |
CT |
BLFDCTAP2MD |
6624 OMNIPOINT COMMUNICATIONS, INC. - CT |
920 |
|
2010-03-21 |
|
| 203-638
| 5 |
Trumbull |
CT |
|
829J PAETEC ITEL, LLC |
920 |
|
|
|
| 203-638
| 6 |
Trumbull |
CT |
|
829J PAETEC ITEL, LLC |
920 |
|
|
|
| 203-638
| 7 |
Trumbull |
CT |
|
829J PAETEC ITEL, LLC |
920 |
|
|
|
| 203-638
| 8 |
Trumbull |
CT |
BLFDCTAP2MD |
6624 OMNIPOINT COMMUNICATIONS, INC. - CT |
920 |
|
2022-05-21 |
|
| 203-638
| 9 |
Trumbull |
CT |
|
829J PAETEC ITEL, LLC |
920 |
|
|
|
| 203-639
| A |
Meriden |
CT |
MRDNCT00DS1 |
9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT |
920 |
|
|
|
| 203-640
| A |
New Haven |
CT |
MDTWCTNIBMD |
4036 NEW CINGULAR WIRELESS PCS, LLC - DC |
920 |
|
|
|
| 203-641
| A |
New Haven |
CT |
HRFRCTASBMD |
6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT |
920 |
|
|
|
| 203-642
| A |
Norwalk |
CT |
SMFRCTDSDS0 |
7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT |
920 |
|
|
|
| 203-642
| 0 |
Norwalk |
CT |
SMFRCTDSDS0 |
7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT |
920 |
|
|
|
| 203-642
| 1 |
Norwalk |
CT |
SMFRCTDSDS0 |
7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT |
920 |
|
|
|
| 203-642
| 2 |
Norwalk |
CT |
SMFRCTDSDS0 |
7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT |
920 |
|
|
|
| 203-642
| 3 |
Norwalk |
CT |
|
612K CSC VOICE, LLC |
920 |
|
2006-11-13 |
|
| 203-642
| 4 |
Norwalk |
CT |
|
612K CSC VOICE, LLC |
920 |
|
2003-07-21 |
|
| 203-642
| 5 |
Norwalk |
CT |
SMFRCTDSDS0 |
7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT |
920 |
|
|
|
| 203-642
| 6 |
Norwalk |
CT |
HRFRCTASBMD |
6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT |
920 |
|
2014-12-05 |
|
| 203-642
| 7 |
Norwalk |
CT |
SMFRCTDSDS0 |
7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT |
920 |
|
|
|
| 203-642
| 8 |
Norwalk |
CT |
HRFRCTASBMD |
6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT |
920 |
|
2014-01-09 |
|
| 203-642
| 9 |
Norwalk |
CT |
HRFRCTASBMD |
6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT |
920 |
|
2014-01-09 |
|
| 203-643
| A |
Branford |
CT |
|
829J PAETEC ITEL, LLC |
920 |
|
|
|
| 203-643
| 0 |
Branford |
CT |
|
829J PAETEC ITEL, LLC |
920 |
|
|
|
| 203-643
| 1 |
Branford |
CT |
|
829J PAETEC ITEL, LLC |
920 |
|
|
|
| 203-643
| 2 |
Branford |
CT |
|
829J PAETEC ITEL, LLC |
920 |
|
|
|
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Last updated: Sun, 17 May 2026 03:26:51 UTC
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