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.

Switch: GNWCCTGNCMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
203-485 0 Greenwich CT 612K CSC VOICE, LLC 132      
203-489 3 Greenwich CT 612K CSC VOICE, LLC 132   2011-07-22   
203-532 5 Byram CT 612K CSC VOICE, LLC 132   2003-11-15   
203-542 5 Greenwich CT 612K CSC VOICE, LLC 132   2003-03-13   
203-681 2 Byram CT 612K CSC VOICE, LLC 132   2010-08-26   
203-769 1 Greenwich CT 612K CSC VOICE, LLC 132   2010-07-23   
203-769 5 Greenwich CT 612K CSC VOICE, LLC 132   2007-04-03   
203-813 3 Byram CT 612K CSC VOICE, LLC 132   2005-04-22   
203-992 A Greenwich CT 612K CSC VOICE, LLC 132      
203-992 1 Greenwich CT 612K CSC VOICE, LLC 132   2006-07-03   

Last updated: Thu, 16 Jul 2026 02:21:55 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.