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: 713

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
203-713 A Milford CT   639C ONVOY, LLC - CT 920      
203-713 0 Milford CT   515J IP HORIZON LLC 920   2022-08-04   
203-713 1 Milford CT   829J PAETEC ITEL, LLC 920   2004-06-12   
203-713 3 Milford CT   145J TERRA NOVA TELECOM INC. 920   2020-12-12   
203-713 4 Milford CT HRFRCT03XMX  145J TERRA NOVA TELECOM INC. 920   2024-08-23   
203-713 5 Milford CT HRFRCTBCDS1  639C ONVOY, LLC - CT 920   2020-11-22   
203-713 6 Milford CT NWHNCT02GT0  9147 SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT 920   2006-07-07   
203-713 7 Milford CT   829J PAETEC ITEL, LLC 920   2009-04-14   
203-713 8 Milford CT NRWLCT028MD  4950 CABLEVISION LIGHTPATH, INC. - CT 920   2010-06-25   
203-713 9 Milford CT HRFRCTBCDS1  639C ONVOY, LLC - CT 920   2021-06-03   

Last updated: Sun, 01 Jun 2025 02:18:11 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.