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, 17 Jan 2015 03:14:15 UTC

How to use this page

NPA: 734 [Rate centres in NPA 734] [Dial plan for NPA 734]

NXX: 223

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA Eff date Disc date Map
734-223 A Ann Arbor MI DTRTMIAPG00 6534 NEW CINGULAR WIRELESS PCS, LLC - IL [link] 340 map

Sponsored by: Callcentric - VoIP Internet phone service