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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OCN: 2043 NORTH TEXAS TEL. CO.

NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
940-524 A Petrolia TX PTRLTXXADS0  548      
940-529 A Petrolia TX BYRSTXXARS0  548      

Last updated: Sat, 01 Aug 2026 03:19:33 UTC

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