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.
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Switch: YBCYCATU0MD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
279-228 A Sacramento: Main DA CA 973E RACE TELECOMMUNICATIONS, INC. - CA 726      
530-817 A Nevada City CA 973E RACE TELECOMMUNICATIONS, INC. - CA 726      
530-874 A Williams CA 973E RACE TELECOMMUNICATIONS, INC. - CA 726      
530-920 A Grass Valley: Main DA CA 973E RACE TELECOMMUNICATIONS, INC. - CA 726      
530-930 A Marysville CA 973E RACE TELECOMMUNICATIONS, INC. - CA 726      

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

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