Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

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 >>

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
203-872 2 Cheshire CT HRFRCT0379Z  199F BANDWIDTH.COM CLEC, LLC - CT 920   2015-02-09   
203-872 3 Cheshire CT HRFRCT03GT0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920   2006-06-30   
203-872 4 Cheshire CT HRFRCT0379Z  199F BANDWIDTH.COM CLEC, LLC - CT 920   2015-05-10   
203-872 5 Cheshire CT HRFRCTBCDS1  639C ONVOY, LLC - CT 920   2015-05-08   
203-872 6 Cheshire CT HRFRCTBCDS1  639C ONVOY, LLC - CT 920   2016-05-04   
203-872 7 Cheshire CT HRFRCT0379Z  199F BANDWIDTH.COM CLEC, LLC - CT 920   2012-12-29   
203-872 8 Cheshire CT   624H ONVOY SPECTRUM, LLC 920   2025-10-04   
203-872 9 Cheshire CT HRFRCTBCDS1  639C ONVOY, LLC - CT 920   2016-02-11   
203-873 A Bridgeport CT MDTWCTNIBMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 920      
203-873 0 Bridgeport CT   612K CSC VOICE, LLC 920   2007-11-08   
203-873 1 Bridgeport CT MDTWCTNIBMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 920   2007-12-17   
203-873 2 Bridgeport CT SMFRCTDSDS0  7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 920   2007-11-02   
203-873 3 Bridgeport CT SMFRCTDSDS0  7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 920   2007-11-02   
203-873 4 Bridgeport CT SMFRCTDSDS0  7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 920   2007-11-02   
203-873 5 Bridgeport CT SMFRCTDSDS0  7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 920   2007-11-02   
203-873 6 Bridgeport CT NWHNCT02GT0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920   2010-01-25   
203-873 7 Bridgeport CT MDTWCTNIBMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 920   2007-03-24   
203-873 8 Bridgeport CT MDTWCTNIBMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 920   2007-03-24   
203-873 9 Bridgeport CT MDTWCTNIBMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 920   2007-03-24   
203-874 A Milford CT MLFRCT00DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-875 A Darien CT NWHNCT02X5X  7421 AT&T - LOCAL 920      
203-875 0 Darien CT HRFRCT0380Z  539F PEERLESS NETWORK OF CONNECTICUT, LLC - CT 920   2013-05-03   
203-875 1 Darien CT SMFRCTDSDS0  7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 920   2003-11-12   
203-875 2 Darien CT SMFRCTDSDS0  7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 920   2003-11-12   
203-875 3 Darien CT SMFRCTDSDS0  7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 920   2003-11-12   
203-875 4 Darien CT SMFRCTDSDS0  7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 920   2003-11-12   
203-875 5 Darien CT SMFRCTDSDS0  7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 920   2003-12-22   
203-875 6 Darien CT SMFRCTDSDS0  7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 920   2003-12-22   
203-875 7 Darien CT SMFRCTDSDS0  7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 920   2003-12-22   
203-875 8 Darien CT SMFRCTDSDS0  7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 920   2003-12-22   
203-875 9 Darien CT NWHNCT02X5X  7421 AT&T - LOCAL 920      
203-876 A Milford CT MLFRCT00DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-877 A Milford CT MLFRCT00DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-878 A Milford CT MLFRCT00DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-879 A Wolcott CT WLCTCT00RS1  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-880 A Trumbull CT HRFRCTCRDS0  7143 TELEPORT COMMUNICATIONS AMERICA, LLC - CT 920      
203-880 0 Trumbull CT HRFRCTCRDS0  7143 TELEPORT COMMUNICATIONS AMERICA, LLC - CT 920      
203-880 1 Trumbull CT HRFRCTBCDS1  639C ONVOY, LLC - CT 920   2022-10-10   
203-880 2 Trumbull CT HRFRCTCRDS0  7143 TELEPORT COMMUNICATIONS AMERICA, LLC - CT 920      
203-880 3 Trumbull CT HRFRCTCRDS0  7143 TELEPORT COMMUNICATIONS AMERICA, LLC - CT 920      
203-880 4 Trumbull CT NWHNCT02GT0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920   2006-07-07   
203-880 5 Trumbull CT WLMNCT132MD  792K CHARTER IP ENABLED SERVICES, LLC 920   2009-12-19   
203-880 6 Trumbull CT   829J PAETEC ITEL, LLC 920   2005-07-25   
203-880 7 Trumbull CT HRFRCTCRDS0  7143 TELEPORT COMMUNICATIONS AMERICA, LLC - CT 920      
203-880 9 Trumbull CT WLMNCT132MD  792K CHARTER IP ENABLED SERVICES, LLC 920   2007-02-08   
203-881 A Seymour CT SYMRCT00RS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-881 0 Seymour CT SYMRCT00RS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-881 1 Seymour CT SYMRCT00RS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-881 2 Seymour CT SYMRCT00RS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-881 3 Seymour CT SYMRCT00RS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-881 4 Seymour CT SYMRCT00RS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-881 5 Seymour CT SYMRCT00RS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-881 6 Seymour CT HRFRCT0379Z  199F BANDWIDTH.COM CLEC, LLC - CT 920   2010-02-28   
203-881 7 Seymour CT SYMRCT00RS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-881 8 Seymour CT SYMRCT00RS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-881 9 Seymour CT SYMRCT00RS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-882 A Milford CT MLFRCT00DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-883 A Stamford CT SMFRCTPU4MD  4800 LEVEL 3 COMMUNICATIONS, LLC - CT 920      
203-883 0 Stamford CT SMFRCTPU4MD  4800 LEVEL 3 COMMUNICATIONS, LLC - CT 920   2009-11-07   
203-883 1 Stamford CT SMFRCTPU4MD  4800 LEVEL 3 COMMUNICATIONS, LLC - CT 920   2010-01-31   
203-883 2 Stamford CT HRFRCTASBMD  6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 920   2014-05-01   
203-883 3 Stamford CT HRFRCTASBMD  6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 920   2014-05-01   
203-883 4 Stamford CT SMFRCTPU4MD  4800 LEVEL 3 COMMUNICATIONS, LLC - CT 920   2010-07-28   
203-883 5 Stamford CT SMFRCTPU4MD  4800 LEVEL 3 COMMUNICATIONS, LLC - CT 920   2013-01-05   
203-883 6 Stamford CT SMFRCTPU4MD  4800 LEVEL 3 COMMUNICATIONS, LLC - CT 920   2010-07-28   
203-883 7 Stamford CT NRWLCT02YMD  4950 CABLEVISION LIGHTPATH, INC. - CT 920   2007-07-13   
203-883 8 Stamford CT   612K CSC VOICE, LLC 920   2007-07-13   
203-883 9 Stamford CT SMFRCTPU4MD  4800 LEVEL 3 COMMUNICATIONS, LLC - CT 920      
203-884 A Guilford CT   639C ONVOY, LLC - CT 920      
203-884 0 Guilford CT HRFRCTBCDS1  639C ONVOY, LLC - CT 920   2015-05-09   
203-884 1 Guilford CT HRFRCTBCDS1  639C ONVOY, LLC - CT 920   2016-04-24   
203-884 2 Guilford CT NWHNCT02XJX  624H ONVOY SPECTRUM, LLC 920   2021-11-08   
203-884 3 Guilford CT NWHNCT02XJX  624H ONVOY SPECTRUM, LLC 920   2021-02-24   
203-884 4 Guilford CT NWHNCT02XJX  624H ONVOY SPECTRUM, LLC 920   2024-05-31   
203-884 5 Guilford CT NWHNCT02XJX  624H ONVOY SPECTRUM, LLC 920   2021-02-24   
203-884 6 Guilford CT HRFRCT0379Z  199F BANDWIDTH.COM CLEC, LLC - CT 920   2016-07-14   
203-884 7 Guilford CT HRFRCTBCDS1  639C ONVOY, LLC - CT 920   2019-02-18   
203-884 8 Guilford CT HRFRCT03HMD  073H TELNYX LLC 920   2018-05-02   
203-884 9 Guilford CT   624H ONVOY SPECTRUM, LLC 920   2025-10-04   
203-885 A Danbury CT HRFRCTASBMD  6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 920      
203-885 0 Danbury CT WLMNCT132MD  792K CHARTER IP ENABLED SERVICES, LLC 920   2007-02-22   
203-885 1 Danbury CT SMFRCTPU4MD  4800 LEVEL 3 COMMUNICATIONS, LLC - CT 920   2007-07-03   
203-885 2 Danbury CT HRFRCTASBMD  6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 920   2007-09-02   
203-885 3 Danbury CT HRFRCTASBMD  6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 920   2006-12-21   
203-885 4 Danbury CT HRFRCTASBMD  6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 920   2008-09-05   
203-885 5 Danbury CT HRFRCTASBMD  6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 920   2007-01-01   
203-885 6 Danbury CT HRFRCTASBMD  6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 920   2008-05-02   
203-885 7 Danbury CT HRFRCT0379Z  199F BANDWIDTH.COM CLEC, LLC - CT 920   2010-07-03   
203-885 8 Danbury CT HRFRCTASBMD  6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 920   2007-02-02   
203-885 9 Danbury CT HRFRCTASBMD  6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 920   2007-02-02   
203-886 A Meriden CT   829J PAETEC ITEL, LLC 920      
203-886 0 Meriden CT   829J PAETEC ITEL, LLC 920      
203-886 1 Meriden CT   829J PAETEC ITEL, LLC 920      
203-886 2 Meriden CT   829J PAETEC ITEL, LLC 920      
203-886 3 Meriden CT   829J PAETEC ITEL, LLC 920      
203-886 4 Meriden CT   829J PAETEC ITEL, LLC 920      
203-886 5 Meriden CT BLFDCTAP2MD  5562 METROPCS, INC. 920   2006-10-20   
203-886 6 Meriden CT BLFDCTAP2MD  5562 METROPCS, INC. 920   2004-07-30   
203-886 7 Meriden CT BLFDCTAP2MD  5562 METROPCS, INC. 920   2004-02-08   
203-886 8 Meriden CT BLFDCTAP2MD  5562 METROPCS, INC. 920   2002-12-03   

<< 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 >>

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.