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: CNCRCA01DS1

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
925-288 A Concord CA 9740 PACIFIC BELL 722      
925-356 A Concord CA 9740 PACIFIC BELL 722      
925-603 A Concord CA 9740 PACIFIC BELL 722      
925-671 A Concord CA 9740 PACIFIC BELL 722      
925-674 A Concord CA 9740 PACIFIC BELL 722      
925-675 A Concord CA 9740 PACIFIC BELL 722      
925-676 A Concord CA 9740 PACIFIC BELL 722      
925-680 A Concord CA 9740 PACIFIC BELL 722      
925-681 A Concord CA 9740 PACIFIC BELL 722      
925-682 A Concord CA 9740 PACIFIC BELL 722      
925-685 A Concord CA 9740 PACIFIC BELL 722      
925-686 A Concord CA 9740 PACIFIC BELL 722      
925-827 A Concord CA 9740 PACIFIC BELL 722      

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

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