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: NAPACA01DS0

Remotes:

Switch Switch name Switch type
CLSTCA11RS0  CALISTOGA  5ER 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
415-878 A Novato CA 7480 PACIFIC BELL (COMPETITIVE) 722      
707-224 A Napa CA 9740 PACIFIC BELL 722      
707-226 A Napa CA 9740 PACIFIC BELL 722      
707-251 A Napa CA 9740 PACIFIC BELL 722      
707-252 A Napa CA 9740 PACIFIC BELL 722      
707-253 A Napa CA 9740 PACIFIC BELL 722      
707-254 A Napa CA 9740 PACIFIC BELL 722      
707-255 A Napa CA 9740 PACIFIC BELL 722      
707-256 A Napa CA 9740 PACIFIC BELL 722      
707-257 A Napa CA 9740 PACIFIC BELL 722      
707-258 A Napa CA 9740 PACIFIC BELL 722      
707-259 A Napa CA 9740 PACIFIC BELL 722      
707-265 A Napa CA 9740 PACIFIC BELL 722      
707-299 A Napa CA 9740 PACIFIC BELL 722      

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

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