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.

Switch: SCRMCA01XTZ

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
279-232 A Michigan Bar CA 939H COMMIO, LLC 726      
279-250 A Sacramento: North DA CA 939H COMMIO, LLC 726   2024-03-03   
279-251 A Sacramento: Main DA CA 939H COMMIO, LLC 726   2024-03-03   
530-373 A Auburn: North DA CA 939H COMMIO, LLC 726      
530-376 A Davis CA 939H COMMIO, LLC 726   2024-02-24   
530-590 A Grass Valley: South DA CA 939H COMMIO, LLC 726      
530-904 A Georgetown CA 939H COMMIO, LLC 726      
530-909 A Meridian CA 939H COMMIO, LLC 726      
530-912 A Truckee CA 939H COMMIO, LLC 726      
530-973 A Arbuckle CA 939H COMMIO, LLC 726   2024-02-25   
916-926 A Sacramento: Main DA CA 939H COMMIO, LLC 726      

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

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