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: 412 [Rate centres in NPA 412] [Dial plan for NPA 412]

NXX: 940

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
412-940 A Pittsburgh Zone 1 PA   671J U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 234   2026-06-23   
412-940 7 Pittsburgh Zone 1 PA   671J U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 234   2026-06-23   

Last updated: Sat, 02 May 2026 12:20:53 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.