Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • 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: Fri, 27 Feb 2015 03:29:43 UTC

Switch: GRWNMIMNRS0

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NPA-NXX BLOCK Rate Centre Region OCN LATA Eff date Disc date Map
231-276 A Interlochen MI 9323 AMERITECH MICHIGAN [link] 348     map
231-943 A Traverse City MI 9323 AMERITECH MICHIGAN [link] 348     map

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