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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OCN: 2342 CITIZENS TELECOM DBA FRONTIER COMM OF TOULUMNE

NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
209-928 A Tuolumne CA TLMNCAXFDS0  738      
530-472 A Oak Run CA OKRNCAXFDS0  724      
530-474 A Shingletown CA SHTNCAXFDS0  724      

Last updated: Thu, 20 Nov 2025 13:34:34 UTC

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