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
203-923 3 Bridgeport CT MDTWCTNIBMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 920   2005-06-19   
203-923 4 Bridgeport CT BLFDCTAP2MD  5562 METROPCS, INC. 920   2004-03-29   
203-923 5 Bridgeport CT BLFDCTAP2MD  5562 METROPCS, INC. 920   2003-11-16   
203-923 6 Bridgeport CT BLFDCTAP2MD  5562 METROPCS, INC. 920   2002-12-30   
203-923 7 Bridgeport CT BLFDCTAP2MD  5562 METROPCS, INC. 920   2002-12-30   
203-923 8 Bridgeport CT   612K CSC VOICE, LLC 920   2005-03-10   
203-923 9 Bridgeport CT SMFRCTDSDS0  7230 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 920      
203-924 A Huntington CT DRBYCT00DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-925 A Huntington CT HNTNCT00DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-926 A Huntington CT HNTNCT00DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-927 A New Haven CT HRFRCTASBMD  6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 920      
203-927 0 New Haven CT HRFRCTASBMD  6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 920   2004-06-18   
203-927 1 New Haven CT HRFRCTASBMD  6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 920      
203-927 2 New Haven CT BLFDCTAP2MD  6624 OMNIPOINT COMMUNICATIONS, INC. - CT 920   2003-05-13   
203-927 3 New Haven CT HRFRCTASBMD  6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 920   2004-05-14   
203-927 4 New Haven CT HRFRCTASBMD  6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 920   2004-05-14   
203-927 5 New Haven CT HRFRCTASBMD  6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 920      
203-927 6 New Haven CT HRFRCTASBMD  6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 920   2004-02-23   
203-927 7 New Haven CT HRFRCTASBMD  6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 920   2003-11-04   
203-927 8 New Haven CT HRFRCTASBMD  6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 920   2004-02-02   
203-927 9 New Haven CT HRFRCTASBMD  6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 920   2003-11-04   
203-928 A New Haven CT NWHNCT03DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-928 0 New Haven CT BLFDCTAP2MD  6624 OMNIPOINT COMMUNICATIONS, INC. - CT 920   2006-09-30   
203-928 1 New Haven CT NWHNCT03DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-928 2 New Haven CT NWHNCT03DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-928 3 New Haven CT NWHNCT03DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-928 4 New Haven CT NWHNCT03DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-928 5 New Haven CT NWHNCT03DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-928 6 New Haven CT NWHNCT03DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-928 7 New Haven CT MDTWCTNIBMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 920   2009-07-28   
203-928 8 New Haven CT BLFDCTAP2MD  6624 OMNIPOINT COMMUNICATIONS, INC. - CT 920   2006-11-25   
203-928 9 New Haven CT MDTWCTNIBMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 920   2009-07-28   
203-929 A Huntington CT HNTNCT00DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-930 A Greenwich CT   4800 LEVEL 3 COMMUNICATIONS, LLC - CT 132   2025-04-25   
203-930 0 Greenwich CT NYCMNY83D1S  350E YMAX COMMUNICATIONS CORP. - CT 132   2010-10-26   
203-930 1 Greenwich CT NYCMNY83DSZ  4800 LEVEL 3 COMMUNICATIONS, LLC - CT 132   2010-05-07   
203-930 2 Greenwich CT NYCMNY83DSZ  4800 LEVEL 3 COMMUNICATIONS, LLC - CT 132      
203-930 3 Greenwich CT NYCMNY83DSZ  4800 LEVEL 3 COMMUNICATIONS, LLC - CT 132      
203-930 4 Greenwich CT NYCMNY37TMD  624H ONVOY SPECTRUM, LLC 132   2021-11-08   
203-930 5 Greenwich CT NYCMNYBXDSL  639C ONVOY, LLC - CT 132      
203-930 6 Greenwich CT NYCMNY83D1S  350E YMAX COMMUNICATIONS CORP. - CT 132   2009-02-06   
203-930 7 Greenwich CT NYCMNY83DS0  7316 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT 132   2008-10-15   
203-930 8 Greenwich CT NYCMNY83D1S  350E YMAX COMMUNICATIONS CORP. - CT 132   2008-06-01   
203-930 9 Greenwich CT   145J TERRA NOVA TELECOM INC. 132   2025-04-28   
203-931 A New Haven CT WSHNCT00DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-931 0 New Haven CT WSHNCT00DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-931 1 New Haven CT WSHNCT00DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-931 2 New Haven CT WSHNCT00DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-931 3 New Haven CT WSHNCT00DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-931 4 New Haven CT WSHNCT00DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-931 5 New Haven CT MDTWCTNIBMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 920   2007-12-28   
203-931 6 New Haven CT WSHNCT00DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-931 7 New Haven CT WSHNCT00DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-931 8 New Haven CT WSHNCT00DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-931 9 New Haven CT WSHNCT00DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-932 A New Haven CT WSHNCT00DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-933 A New Haven CT WSHNCT00DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-934 A New Haven CT WSHNCT00DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-935 A Meriden CT   4800 LEVEL 3 COMMUNICATIONS, LLC - CT 920   2025-04-26   
203-935 0 Meriden CT   829J PAETEC ITEL, LLC 920   2001-05-17   
203-935 1 Meriden CT BLFDCTAP2MD  5562 METROPCS, INC. 920   2010-07-16   
203-935 2 Meriden CT SMFRCTPU4MD  4800 LEVEL 3 COMMUNICATIONS, LLC - CT 920      
203-935 3 Meriden CT HRFRCTBCDS1  639C ONVOY, LLC - CT 920   2022-10-10   
203-935 4 Meriden CT NWHNCT02XJX  624H ONVOY SPECTRUM, LLC 920   2024-10-22   
203-935 5 Meriden CT BLFDCTAP2MD  6624 OMNIPOINT COMMUNICATIONS, INC. - CT 920   2021-11-01   
203-935 6 Meriden CT BLFDCTAP2MD  5562 METROPCS, INC. 920   2007-03-19   
203-935 7 Meriden CT BLFDCTAP2MD  5562 METROPCS, INC. 920   2006-01-16   
203-935 8 Meriden CT HRFRCT0379Z  199F BANDWIDTH.COM CLEC, LLC - CT 920   2014-04-19   
203-935 9 Meriden CT   624H ONVOY SPECTRUM, LLC 920   2025-10-04   
203-936 A New Haven CT NWHNCT03DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-936 0 New Haven CT NWHNCT03DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920   2008-10-02   
203-936 1 New Haven CT NWHNCT03DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920   2008-10-02   
203-936 2 New Haven CT NWHNCT03DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920   2008-10-02   
203-936 3 New Haven CT NWHNCT03DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920   2008-10-02   
203-936 4 New Haven CT NWHNCT03DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920   2008-10-02   
203-936 5 New Haven CT NWHNCT03DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920   2008-10-02   
203-936 6 New Haven CT SMFRCTPU4MD  4800 LEVEL 3 COMMUNICATIONS, LLC - CT 920   2010-07-02   
203-936 7 New Haven CT HRFRCT0379Z  199F BANDWIDTH.COM CLEC, LLC - CT 920   2008-11-29   
203-936 8 New Haven CT HRFRCT0379Z  199F BANDWIDTH.COM CLEC, LLC - CT 920   2008-11-29   
203-936 9 New Haven CT HRFRCT0379Z  199F BANDWIDTH.COM CLEC, LLC - CT 920   2008-11-29   
203-937 A New Haven CT WSHNCT00DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-937 0 New Haven CT WSHNCT00DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-937 1 New Haven CT WSHNCT00DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-937 2 New Haven CT HRFRCTASDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 920   2010-05-14   
203-937 3 New Haven CT WSHNCT00DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-937 4 New Haven CT WSHNCT00DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-937 5 New Haven CT WSHNCT00DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-937 6 New Haven CT WSHNCT00DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-937 7 New Haven CT WSHNCT00DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-937 8 New Haven CT WSHNCT00DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-937 9 New Haven CT WSHNCT00DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-938 A Redding CT RDNGCT00RS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-939 A Norwalk CT   612K CSC VOICE, LLC 920      
203-939 0 Norwalk CT HRFRCTASBMD  6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 920   2012-12-13   
203-939 1 Norwalk CT   612K CSC VOICE, LLC 920   2008-08-28   
203-939 2 Norwalk CT HRFRCTASBMD  6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 920   2011-11-03   
203-939 3 Norwalk CT HRFRCTASBMD  6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 920   2011-11-03   
203-939 4 Norwalk CT HRFRCTASBMD  6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 920   2012-12-13   
203-939 5 Norwalk CT HRFRCTASBMD  6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 920   2012-10-12   
203-939 6 Norwalk CT HRFRCTASBMD  6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 920   2012-10-12   

<< 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: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.