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: 350 [Rate centres in NPA 350] [Dial plan for NPA 350]

NXX: 258

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
350-258 A Atwater CA   649C ONVOY, LLC - CA 738   2026-08-21   
350-258 0 Atwater CA   649C ONVOY, LLC - CA 738   2026-08-21   
350-258 1 Atwater CA   649C ONVOY, LLC - CA 738   2026-08-21   
350-258 9 Atwater CA   981E BANDWIDTH.COM CLEC, LLC - CA 738   2026-08-24   

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

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.