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: PSBGCA01DS0

Remotes:

Switch Switch name Switch type
BTISCA11RS0  BETHEL ISLAND  RSC 
CNCRCA01RS1  CONCORD  RSC 
RCMDCA11RS2  RICHMOND MAIN  RSC 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
925-252 A Pittsburg CA 9740 PACIFIC BELL 722      
925-427 A Pittsburg CA 9740 PACIFIC BELL 722      
925-431 A Pittsburg CA 9740 PACIFIC BELL 722      
925-432 A Pittsburg CA 9740 PACIFIC BELL 722      
925-439 A Pittsburg CA 9740 PACIFIC BELL 722      
925-473 A Pittsburg CA 9740 PACIFIC BELL 722      

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

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