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.
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Switch: CLMBOH11XHZ

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
740-306 1 Guyan OH 024E ARMSTRONG TELECOMMUNICATIONS, INC. - OH 324   2010-04-02   
740-523 A Ironton OH 024E ARMSTRONG TELECOMMUNICATIONS, INC. - OH 324      
740-573 2 Arabia OH 024E ARMSTRONG TELECOMMUNICATIONS, INC. - OH 324   2008-10-19   

Last updated: Thu, 20 Nov 2025 13:34:34 UTC

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