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: 760 [Rate centres in NPA 760] [Dial plan for NPA 760]

NXX: 923

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
760-923 A Mammoth Lakes CA VTVLCAXAX5Y  649C ONVOY, LLC - CA 730   2024-01-23   
760-923 0 Mammoth Lakes CA   649C ONVOY, LLC - CA 730      
760-923 1 Mammoth Lakes CA   649C ONVOY, LLC - CA 730      
760-923 2 Mammoth Lakes CA   9262 UTILITY TELECOM GROUP, LLC - CA 730   2008-08-29   
760-923 3 Mammoth Lakes CA   649C ONVOY, LLC - CA 730   2006-01-14   
760-923 4 Mammoth Lakes CA   649C ONVOY, LLC - CA 730      
760-923 6 Mammoth Lakes CA   624H ONVOY SPECTRUM, LLC 730   2021-12-13   
760-923 7 Mammoth Lakes CA   624H ONVOY SPECTRUM, LLC 730   2021-12-13   
760-923 8 Mammoth Lakes CA   6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 730   2021-06-01   
760-923 9 Mammoth Lakes CA   145J TERRA NOVA TELECOM INC. 730   2021-04-28   

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

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.