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: 322

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
279-322 A Walnut Grove CA SCRMCA0104Z  965H FRACTEL, LLC 726      
279-322 1 Walnut Grove CA   490J DISH WIRELESS, LLC 726   2023-10-29   
279-322 2 Walnut Grove CA   965H FRACTEL, LLC 726   2021-09-06   
279-322 3 Walnut Grove CA   624H ONVOY SPECTRUM, LLC 726   2023-07-29   
279-322 7 Walnut Grove CA   624H ONVOY SPECTRUM, LLC 726   2024-10-20   
279-322 8 Walnut Grove CA   624H ONVOY SPECTRUM, LLC 726   2024-10-20   
279-322 9 Walnut Grove CA   373F PEERLESS NETWORK OF CALIFORNIA, LLC - CA 726   2021-09-30   

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.