Local Calling Guide

Area code/prefix search

Search by area code/prefix (NPA/NXX) or OCN

  • 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.

Last updated: Tue, 23 Dec 2014 03:54:08 UTC

How to use this page

NPA: 203 [Rate centres in NPA 203] [Dial plan for NPA 203]

NXX: 812

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA Eff date Disc date Map
203-812 A New Haven CT NWHNCT03DS0 9147 SOUTHERN NEW ENGLAND TELEPHONE CO. [link] 920 map
203-812 0 New Haven CT 4036 NEW CINGULAR WIRELESS PCS, LLC - DC [link] 920 2006-05-16
203-812 1 New Haven CT 9147 SOUTHERN NEW ENGLAND TELEPHONE CO. [link] 920
203-812 2 New Haven CT 9147 SOUTHERN NEW ENGLAND TELEPHONE CO. [link] 920
203-812 3 New Haven CT 9147 SOUTHERN NEW ENGLAND TELEPHONE CO. [link] 920
203-812 4 New Haven CT 9147 SOUTHERN NEW ENGLAND TELEPHONE CO. [link] 920
203-812 5 New Haven CT 9147 SOUTHERN NEW ENGLAND TELEPHONE CO. [link] 920
203-812 6 New Haven CT 9147 SOUTHERN NEW ENGLAND TELEPHONE CO. [link] 920
203-812 7 New Haven CT 9147 SOUTHERN NEW ENGLAND TELEPHONE CO. [link] 920
203-812 8 New Haven CT 6664 SPRINT SPECTRUM L.P. [link] 920 2005-10-30
203-812 9 New Haven CT 4036 NEW CINGULAR WIRELESS PCS, LLC - DC [link] 920 2006-05-16



Sponsored by: Callcentric - VoIP Internet phone service