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: Wed, 12 Jun 2013 23:24:04 UTC

How to use this page

NPA: 972 [Rate centres in NPA 972] [Dial plan for NPA 972]

NXX: 436

NPA-NXX-X Rate Centre Region Switch OCN LATA Eff date Disc date Map
972-436 Lewisville TX LWVLTXXADS0 4344 GTE-SW DBA VERIZON SW INC.-TX [link] 552 map


Sponsored by: Telmetrics