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: 604

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
661-604 A Lancaster CA BLTNCAADGMD  6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 730      
661-604 0 Lancaster CA BLTNCAADGMD  6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 730   2023-04-03   
661-604 1 Lancaster CA BLTNCAADGMD  6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 730   2023-04-03   
661-604 2 Lancaster CA BLTNCAADGMD  6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 730   2023-04-03   
661-604 3 Lancaster CA   6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 730   2024-03-23   
661-604 4 Lancaster CA LSANCAJWMMD  490J DISH WIRELESS, LLC 730   2023-11-18   
661-604 5 Lancaster CA ANHMCACLCM6  6010 NEW CINGULAR WIRELESS PCS, LLC 730   2023-04-08   
661-604 6 Lancaster CA   6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 730   2024-05-23   
661-604 7 Lancaster CA   649C ONVOY, LLC - CA 730   2024-02-25   
661-604 8 Lancaster CA   649C ONVOY, LLC - CA 730   2024-02-25   
661-604 9 Lancaster CA ANHMCACLCM6  6010 NEW CINGULAR WIRELESS PCS, LLC 730   2024-01-08   

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.