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.

Switch: FRSNCA01XCZ

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
559-231 A Fresno CA 516C AT&T CORP. 728      
559-372 A Visalia CA 516C AT&T CORP. 728      
559-375 A Fresno CA 516C AT&T CORP. 728      
559-377 A Madera CA 516C AT&T CORP. 728      
559-383 A Avenal CA 516C AT&T CORP. 728      
559-384 A Burrel CA 516C AT&T CORP. 728      
559-721 A Fresno CA 516C AT&T CORP. 728      

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.