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: 437

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
412-437 A Pittsburgh Zone 6 PA   4007 LEVEL 3 COMMUNICATIONS, LLC - PA 234      
412-437 2 Pittsburgh Zone 6 PA   4007 LEVEL 3 COMMUNICATIONS, LLC - PA 234      
412-437 3 Pittsburgh Zone 6 PA   8597 CONSOLIDATED COMMUNICATIONS ENTERPRISE SERVICES-PA 234   2011-04-22   
412-437 6 Pittsburgh Zone 6 PA   6701 AERIAL COMMUNICATIONS, INC. 234   2021-05-10   
412-437 7 Pittsburgh Zone 6 PA   6701 AERIAL COMMUNICATIONS, INC. 234   2021-05-10   
412-437 8 Pittsburgh Zone 6 PA   002F BANDWIDTH.COM CLEC, LLC - PA 234   2011-09-26   

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.