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: 279 [Rate centres in NPA 279] [Dial plan for NPA 279]

NXX: 254

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
279-254 A Elk Grove CA WSCRCAKE1MD  6529 T-MOBILE USA, INC. 726   2024-03-28   
279-254 0 Elk Grove CA   649C ONVOY, LLC - CA 726   2024-07-07   
279-254 1 Elk Grove CA   649C ONVOY, LLC - CA 726   2024-07-07   
279-254 2 Elk Grove CA   6529 T-MOBILE USA, INC. 726   2024-11-08   
279-254 3 Elk Grove CA   6529 T-MOBILE USA, INC. 726   2024-11-08   
279-254 4 Elk Grove CA   6529 T-MOBILE USA, INC. 726   2025-10-19   
279-254 5 Elk Grove CA   6529 T-MOBILE USA, INC. 726   2024-09-15   
279-254 6 Elk Grove CA   6529 T-MOBILE USA, INC. 726   2024-09-15   
279-254 7 Elk Grove CA   6529 T-MOBILE USA, INC. 726   2025-10-19   
279-254 8 Elk Grove CA   6529 T-MOBILE USA, INC. 726   2024-03-28   
279-254 9 Elk Grove CA   6529 T-MOBILE USA, INC. 726   2024-03-28   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.