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.

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

NXX: 567

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
304-567 A Riverton WV RVTNWVXADS0  0257 SPRUCE KNOB SENECA ROCKS TEL. CO. 256      

Last updated: Sun, 17 May 2026 03:26:51 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.