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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NPA: 304 [Rate centres in NPA 304] [Dial plan for NPA 304]

NXX: 813

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
304-813 A Keyser WV CMLDMDCM5MD  6284 UNITED STATES CELLULAR - WV 240      

Last updated: Sun, 01 Jun 2025 02:18:11 UTC

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