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: 661 [Rate centres in NPA 661] [Dial plan for NPA 661]

NXX: 627

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
661-627 A Santa Clarita: Newhall-Castaic DA CA TRNECAGB7MD  6529 T-MOBILE USA, INC. 730      
661-627 0 Santa Clarita: Newhall-Castaic DA CA LSANCARCD3S  649C ONVOY, LLC - CA 730   2021-07-22   
661-627 1 Santa Clarita: Newhall-Castaic DA CA LSANCARCD3S  649C ONVOY, LLC - CA 730   2021-07-22   
661-627 2 Santa Clarita: Newhall-Castaic DA CA LSANCARCD3S  649C ONVOY, LLC - CA 730   2021-07-22   
661-627 3 Santa Clarita: Newhall-Castaic DA CA LSANCARCD3S  649C ONVOY, LLC - CA 730   2021-07-22   
661-627 4 Santa Clarita: Newhall-Castaic DA CA LSANCA03GMD  624H ONVOY SPECTRUM, LLC 730   2021-11-15   
661-627 5 Santa Clarita: Newhall-Castaic DA CA LSANCAJWJMD  516J TON80 COMMUNICATIONS, LLC 730   2021-08-31   
661-627 6 Santa Clarita: Newhall-Castaic DA CA TRNECAGB7MD  6529 T-MOBILE USA, INC. 730   2021-05-07   
661-627 7 Santa Clarita: Newhall-Castaic DA CA TRNECAGB7MD  6529 T-MOBILE USA, INC. 730   2021-05-07   
661-627 8 Santa Clarita: Newhall-Castaic DA CA TRNECAGB7MD  6529 T-MOBILE USA, INC. 730   2021-04-12   
661-627 9 Santa Clarita: Newhall-Castaic DA CA TRNECAGB7MD  6529 T-MOBILE USA, INC. 730   2021-04-12   

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.