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: 559 [Rate centres in NPA 559] [Dial plan for NPA 559]

NXX: 566

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
559-566 A Three Rivers CA FRSMCA150MD  8826 LEVEL 3 COMMUNICATIONS, LLC - CA 728      
559-566 0 Three Rivers CA FRSNCA01XOY  649C ONVOY, LLC - CA 728      
559-566 2 Three Rivers CA FRSNCA01XOY  649C ONVOY, LLC - CA 728      
559-566 6 Three Rivers CA FRSNCA01XNY  981E BANDWIDTH.COM CLEC, LLC - CA 728   2018-04-16   
559-566 7 Three Rivers CA FRSNCA01XOY  649C ONVOY, LLC - CA 728   2019-02-24   
559-566 8 Three Rivers CA FRSNCA01XOY  649C ONVOY, LLC - CA 728   2019-02-24   

Last updated: Thu, 20 Nov 2025 13:34:34 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.