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: 307 [Rate centres in NPA 307] [Dial plan for NPA 307]

NXX: 780

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
307-780 A Mountain View WY CHYNWYVACM1  013B UNION TELEPHONE COMPANY 654      

Last updated: Sun, 18 Aug 2024 23:40:19 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.