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]

NXX: 309

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
203-309 A Darien CT BLFDCTAP2MD  5562 METROPCS, INC. 920      
203-309 0 Darien CT SMFRCTPU4MD  4800 LEVEL 3 COMMUNICATIONS, LLC - CT 920   2008-03-10   
203-309 1 Darien CT HRFRCT0379Z  199F BANDWIDTH.COM CLEC, LLC - CT 920   2014-04-19   
203-309 2 Darien CT HRFRCT0379Z  199F BANDWIDTH.COM CLEC, LLC - CT 920   2010-08-07   
203-309 3 Darien CT HRFRCT0379Z  199F BANDWIDTH.COM CLEC, LLC - CT 920   2012-06-02   
203-309 4 Darien CT SMFRCTPU4MD  4800 LEVEL 3 COMMUNICATIONS, LLC - CT 920   2012-07-29   
203-309 5 Darien CT NRWLCT028MD  4950 CABLEVISION LIGHTPATH, INC. - CT 920   2011-08-19   
203-309 6 Darien CT HRFRCT0379Z  199F BANDWIDTH.COM CLEC, LLC - CT 920   2012-09-07   
203-309 7 Darien CT BLFDCTAP2MD  5562 METROPCS, INC. 920   2007-11-02   
203-309 8 Darien CT BLFDCTAP2MD  5562 METROPCS, INC. 920   2007-11-02   
203-309 9 Darien CT   5562 METROPCS, INC. 920   2007-11-02   

Last updated: Wed, 07 Feb 2024 04:12:25 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.