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: STHNCA11DS0

Remotes:

Switch Switch name Switch type
ANGWCA11RS1  ANGWIN  RSC 
LKBRCA11RS1  LAKE BERRYESSA  RSC 
YNVLCA11RS0  YOUNTVILLE  RSS 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
707-963 A St Helena CA 9740 PACIFIC BELL 722      
707-967 A St Helena CA 9740 PACIFIC BELL 722      
707-968 A St Helena CA 9740 PACIFIC BELL 722      

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

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