Local Calling Guide
Area code/prefix search
NPA: 203
[Rate centres in NPA 203]
[Dial plan for NPA 203]
<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 >>
| NPA-NXX |
BLOCK |
Rate Centre |
Region |
Switch |
OCN |
LATA |
LIR |
Eff date |
Disc date |
| 203-842
| 4 |
Norwalk |
CT |
|
4800 LEVEL 3 COMMUNICATIONS, LLC - CT |
920 |
|
|
|
| 203-842
| 5 |
Norwalk |
CT |
SMFRCTPU4MD |
4800 LEVEL 3 COMMUNICATIONS, LLC - CT |
920 |
|
|
|
| 203-842
| 6 |
Norwalk |
CT |
|
829J PAETEC ITEL, LLC |
920 |
|
2011-07-06 |
|
| 203-842
| 7 |
Norwalk |
CT |
NWHNCT02GT0 |
9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT |
920 |
|
2011-08-11 |
|
| 203-842
| 8 |
Norwalk |
CT |
HRFRCT0379Z |
199F BANDWIDTH.COM CLEC, LLC - CT |
920 |
|
2012-09-22 |
|
| 203-842
| 9 |
Norwalk |
CT |
|
639C ONVOY, LLC - CT |
920 |
|
2026-01-05 |
|
| 203-843
| A |
New Haven |
CT |
|
4036 NEW CINGULAR WIRELESS PCS, LLC - DC |
920 |
|
|
|
| 203-843
| 0 |
New Haven |
CT |
MDTWCTNIBMD |
4036 NEW CINGULAR WIRELESS PCS, LLC - DC |
920 |
|
2004-03-06 |
|
| 203-843
| 1 |
New Haven |
CT |
MDTWCTNIBMD |
4036 NEW CINGULAR WIRELESS PCS, LLC - DC |
920 |
|
2004-03-06 |
|
| 203-843
| 2 |
New Haven |
CT |
MDTWCTNIBMD |
4036 NEW CINGULAR WIRELESS PCS, LLC - DC |
920 |
|
2004-03-06 |
|
| 203-843
| 3 |
New Haven |
CT |
MDTWCTNIBMD |
4036 NEW CINGULAR WIRELESS PCS, LLC - DC |
920 |
|
2004-03-06 |
|
| 203-843
| 4 |
New Haven |
CT |
MDTWCTNIBMD |
4036 NEW CINGULAR WIRELESS PCS, LLC - DC |
920 |
|
2004-03-06 |
|
| 203-843
| 5 |
New Haven |
CT |
MDTWCTNIBMD |
4036 NEW CINGULAR WIRELESS PCS, LLC - DC |
920 |
|
2004-03-06 |
|
| 203-843
| 6 |
New Haven |
CT |
MDTWCTNIBMD |
4036 NEW CINGULAR WIRELESS PCS, LLC - DC |
920 |
|
2004-03-06 |
|
| 203-843
| 7 |
New Haven |
CT |
MDTWCTNIBMD |
4036 NEW CINGULAR WIRELESS PCS, LLC - DC |
920 |
|
2004-03-06 |
|
| 203-843
| 8 |
New Haven |
CT |
MDTWCTNIBMD |
4036 NEW CINGULAR WIRELESS PCS, LLC - DC |
920 |
|
2004-03-06 |
|
| 203-843
| 9 |
New Haven |
CT |
|
7143 TELEPORT COMMUNICATIONS AMERICA, LLC - CT |
920 |
|
|
|
| 203-844
| A |
Fairfield |
CT |
SMFRCTDSDS0 |
7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT |
920 |
|
|
|
| 203-844
| 0 |
Fairfield |
CT |
SMFRCTPU4MD |
4800 LEVEL 3 COMMUNICATIONS, LLC - CT |
920 |
|
2004-12-16 |
|
| 203-844
| 1 |
Fairfield |
CT |
SMFRCTDSDS0 |
7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT |
920 |
|
2005-02-04 |
|
| 203-844
| 2 |
Fairfield |
CT |
SMFRCTDSDS0 |
7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT |
920 |
|
2005-02-04 |
|
| 203-844
| 3 |
Fairfield |
CT |
SMFRCTDSDS0 |
7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT |
920 |
|
2005-02-04 |
|
| 203-844
| 4 |
Fairfield |
CT |
SMFRCTDSDS0 |
7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT |
920 |
|
2004-10-08 |
|
| 203-844
| 5 |
Fairfield |
CT |
SMFRCTDSDS0 |
7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT |
920 |
|
2004-10-08 |
|
| 203-844
| 6 |
Fairfield |
CT |
SMFRCTDSDS0 |
7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT |
920 |
|
2004-10-08 |
|
| 203-844
| 7 |
Fairfield |
CT |
SMFRCTDSDS0 |
7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT |
920 |
|
2004-10-07 |
|
| 203-844
| 8 |
Fairfield |
CT |
SMFRCTDSDS0 |
7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT |
920 |
|
2004-10-07 |
|
| 203-844
| 9 |
Fairfield |
CT |
SMFRCTDSDS0 |
7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT |
920 |
|
2004-10-07 |
|
| 203-845
| A |
Norwalk |
CT |
NRWLCT03DS0 |
9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT |
920 |
|
|
|
| 203-846
| A |
Norwalk |
CT |
NRWLCT03DS0 |
9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT |
920 |
|
|
|
| 203-847
| A |
Norwalk |
CT |
NRWLCT03DS0 |
9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT |
920 |
|
|
|
| 203-848
| A |
New Haven |
CT |
|
829J PAETEC ITEL, LLC |
920 |
|
|
|
| 203-848
| 0 |
New Haven |
CT |
MDTWCTNIBMD |
4036 NEW CINGULAR WIRELESS PCS, LLC - DC |
920 |
|
2004-03-06 |
|
| 203-848
| 1 |
New Haven |
CT |
|
829J PAETEC ITEL, LLC |
920 |
|
2002-11-08 |
|
| 203-848
| 2 |
New Haven |
CT |
|
829J PAETEC ITEL, LLC |
920 |
|
2002-11-24 |
|
| 203-848
| 3 |
New Haven |
CT |
|
829J PAETEC ITEL, LLC |
920 |
|
2004-08-05 |
|
| 203-848
| 4 |
New Haven |
CT |
HRFRCTASBMD |
6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT |
920 |
|
2005-01-04 |
|
| 203-848
| 5 |
New Haven |
CT |
HRFRCTASBMD |
6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT |
920 |
|
2005-01-04 |
|
| 203-848
| 6 |
New Haven |
CT |
|
829J PAETEC ITEL, LLC |
920 |
|
|
|
| 203-848
| 7 |
New Haven |
CT |
HRFRCTASBMD |
6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT |
920 |
|
2005-04-01 |
|
| 203-848
| 8 |
New Haven |
CT |
HRFRCTASBMD |
6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT |
920 |
|
2004-12-02 |
|
| 203-848
| 9 |
New Haven |
CT |
HRFRCTASBMD |
6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT |
920 |
|
2005-05-09 |
|
| 203-849
| A |
Norwalk |
CT |
NRWLCT03DS0 |
9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT |
920 |
|
|
|
| 203-850
| A |
New Haven |
CT |
BLFDCTAP2MD |
5562 METROPCS, INC. |
920 |
|
|
|
| 203-850
| 0 |
New Haven |
CT |
BLFDCTAP2MD |
5562 METROPCS, INC. |
920 |
|
2008-11-17 |
|
| 203-850
| 1 |
New Haven |
CT |
BLFDCTAP2MD |
5562 METROPCS, INC. |
920 |
|
2008-11-17 |
|
| 203-850
| 2 |
New Haven |
CT |
BLFDCTAP2MD |
5562 METROPCS, INC. |
920 |
|
2008-11-17 |
|
| 203-850
| 3 |
New Haven |
CT |
BLFDCTAP2MD |
5562 METROPCS, INC. |
920 |
|
2008-11-17 |
|
| 203-850
| 4 |
New Haven |
CT |
BLFDCTAP2MD |
5562 METROPCS, INC. |
920 |
|
2008-11-17 |
|
| 203-850
| 5 |
New Haven |
CT |
BLFDCTAP2MD |
5562 METROPCS, INC. |
920 |
|
2013-07-08 |
|
<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 >>
Last updated: Sun, 17 May 2026 03:26:51 UTC
Sponsored by: ISP Telecom
Like this site? We accept donations via PayPal.