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: Sun, 16 Jun 2013 02:49:06 UTC

How to use this page

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

NXX: 506

NPA-NXX-X Rate Centre Region Switch OCN LATA Eff date Disc date Map
203-506 New Haven CT 4036 NEW CINGULAR WIRELESS PCS, LLC - DC [link] 920 map


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