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 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
203-299 1 Norwalk CT NRWLCT02DS2  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-299 2 Norwalk CT HRFRCT0379Z  199F BANDWIDTH.COM CLEC, LLC - CT 920   2011-05-27   
203-299 3 Norwalk CT NRWLCT02DS2  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-299 4 Norwalk CT NRWLCT02DS2  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-299 5 Norwalk CT NRWLCT02DS2  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-299 6 Norwalk CT HRFRCTASBMD  6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 920   2014-06-01   
203-299 7 Norwalk CT HRFRCTASBMD  6388 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 920   2014-06-01   
203-299 8 Norwalk CT NRWLCT02DS2  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-299 9 Norwalk CT NRWLCT02DS2  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-300 A Danbury CT BLFDCTAP2MD  6624 OMNIPOINT COMMUNICATIONS, INC. - CT 920      
203-300 0 Danbury CT BLFDCTAP2MD  6624 OMNIPOINT COMMUNICATIONS, INC. - CT 920      
203-300 1 Danbury CT BLFDCTAP2MD  6624 OMNIPOINT COMMUNICATIONS, INC. - CT 920      
203-300 2 Danbury CT BLFDCTAP2MD  6624 OMNIPOINT COMMUNICATIONS, INC. - CT 920      
203-300 3 Danbury CT BLFDCTAP2MD  6624 OMNIPOINT COMMUNICATIONS, INC. - CT 920      
203-300 4 Danbury CT MDTWCTNIBMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 920   2004-11-06   
203-300 5 Danbury CT HRFRCTCR3MD  318J COMCAST IP PHONE, LLC 920   2004-12-18   
203-300 6 Danbury CT BLFDCTAP2MD  6624 OMNIPOINT COMMUNICATIONS, INC. - CT 920      
203-300 7 Danbury CT BLFDCTAP2MD  6624 OMNIPOINT COMMUNICATIONS, INC. - CT 920      
203-300 8 Danbury CT BLFDCTAP2MD  6624 OMNIPOINT COMMUNICATIONS, INC. - CT 920      
203-300 9 Danbury CT BLFDCTAP2MD  6624 OMNIPOINT COMMUNICATIONS, INC. - CT 920      
203-301 A Milford CT MLFRCT00DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-301 0 Milford CT MLFRCT00DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-301 1 Milford CT MLFRCT00DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-301 2 Milford CT MLFRCT00DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-301 3 Milford CT MLFRCT00DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-301 4 Milford CT   612K CSC VOICE, LLC 920   2007-11-08   
203-301 5 Milford CT MLFRCT00DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-301 6 Milford CT MLFRCT00DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-301 7 Milford CT MLFRCT00DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-301 8 Milford CT HRFRCT0379Z  199F BANDWIDTH.COM CLEC, LLC - CT 920   2011-06-01   
203-301 9 Milford CT MLFRCT00DS0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920      
203-302 A Greenwich CT WHPLNY02DS5  7140 TC SYSTEMS, INC. - NY 132      
203-302 0 Greenwich CT NYCMNY83D1S  350E YMAX COMMUNICATIONS CORP. - CT 132   2011-03-07   
203-302 1 Greenwich CT GNWCCTGNX5Y  4950 CABLEVISION LIGHTPATH, INC. - CT 132   2002-04-08   
203-302 2 Greenwich CT GNWCCTGNX5Y  4950 CABLEVISION LIGHTPATH, INC. - CT 132   2002-04-08   
203-302 3 Greenwich CT   829J PAETEC ITEL, LLC 132   2002-10-28   
203-302 4 Greenwich CT WHPLNY02DS5  7140 TC SYSTEMS, INC. - NY 132      
203-302 5 Greenwich CT NYCMNY83D1S  350E YMAX COMMUNICATIONS CORP. - CT 132   2010-08-09   
203-302 6 Greenwich CT WHPLNY02DS5  7140 TC SYSTEMS, INC. - NY 132   2006-08-17   
203-302 7 Greenwich CT GNWCCTGNX5Y  4950 CABLEVISION LIGHTPATH, INC. - CT 132   2005-09-23   
203-302 8 Greenwich CT NYCMNYAACML  5562 METROPCS, INC. 132   2004-03-16   
203-302 9 Greenwich CT WHPLNYWPXOY  199F BANDWIDTH.COM CLEC, LLC - CT 132   2010-08-07   
203-303 A Wallingford CT HRFRCTCRDS0  7143 TELEPORT COMMUNICATIONS AMERICA, LLC - CT 920      
203-303 0 Wallingford CT HRFRCTCRDS0  7143 TELEPORT COMMUNICATIONS AMERICA, LLC - CT 920      
203-303 1 Wallingford CT HRFRCTCR3MD  318J COMCAST IP PHONE, LLC 920   2017-09-14   
203-303 2 Wallingford CT HRFRCTCRDS0  7143 TELEPORT COMMUNICATIONS AMERICA, LLC - CT 920      
203-303 3 Wallingford CT HRFRCTCRDS0  7143 TELEPORT COMMUNICATIONS AMERICA, LLC - CT 920      
203-303 4 Wallingford CT HRFRCT0379Z  199F BANDWIDTH.COM CLEC, LLC - CT 920   2010-09-09   
203-303 5 Wallingford CT HRFRCTASDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 920   2003-06-18   
203-303 6 Wallingford CT HRFRCTCRDS0  7143 TELEPORT COMMUNICATIONS AMERICA, LLC - CT 920      

<< 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: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.