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: HLBGCA11DS0

Remotes:

Switch Switch name Switch type
CODLCA11RS0  CLOVERDALE  RSS 
GYVLCA11RS0  GEYSERVILLE  RSC 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
707-431 A Healdsburg CA 9740 PACIFIC BELL 722      
707-433 A Healdsburg CA 9740 PACIFIC BELL 722      
707-473 A Healdsburg CA 9740 PACIFIC BELL 722      
707-473 0 Healdsburg CA 9740 PACIFIC BELL 722      
707-473 2 Healdsburg CA 9740 PACIFIC BELL 722      
707-473 3 Healdsburg CA 9740 PACIFIC BELL 722      
707-473 4 Healdsburg CA 9740 PACIFIC BELL 722      
707-473 9 Healdsburg CA 9740 PACIFIC BELL 722      

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

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