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: Sat, 30 Aug 2014 11:47:04 UTC

How to use this page

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

NXX: 553

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA Eff date Disc date Map
203-553 A New Haven CT NWHNCT03DS0 9147 SOUTHERN NEW ENGLAND TELEPHONE CO. [link] 920 map
203-553 0 New Haven CT 9147 SOUTHERN NEW ENGLAND TELEPHONE CO. [link] 920
203-553 1 New Haven CT 9147 SOUTHERN NEW ENGLAND TELEPHONE CO. [link] 920
203-553 2 New Haven CT 9147 SOUTHERN NEW ENGLAND TELEPHONE CO. [link] 920
203-553 3 New Haven CT 9147 SOUTHERN NEW ENGLAND TELEPHONE CO. [link] 920
203-553 4 New Haven CT 9147 SOUTHERN NEW ENGLAND TELEPHONE CO. [link] 920
203-553 5 New Haven CT 9147 SOUTHERN NEW ENGLAND TELEPHONE CO. [link] 920
203-553 6 New Haven CT 9147 SOUTHERN NEW ENGLAND TELEPHONE CO. [link] 920
203-553 7 New Haven CT 7621 COMCAST PHONE OF CONNECTICUT, INC. - CT [link] 920 2008-09-26
203-553 8 New Haven CT 9147 SOUTHERN NEW ENGLAND TELEPHONE CO. [link] 920
203-553 9 New Haven CT 4950 CABLEVISION LIGHTPATH, INC. - CT [link] 920 2011-08-26



Sponsored by: Execulink Telecom