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.
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OCN: 7453 U.S. TELEPACIFIC CORP. - CA

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NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
925-627 1 Walnut Creek CA   722      
925-627 2 Walnut Creek CA   722      
925-627 3 Walnut Creek CA   722      
925-627 4 Walnut Creek CA   722      
925-627 5 Walnut Creek CA   722      
925-627 7 Walnut Creek CA   722      
925-627 9 Walnut Creek CA   722      
925-643 A Pittsburg West CA SNJSCAYBDS0  722      
925-643 9 Pittsburg West CA   722      
925-666 4 East Contra Costa CA   722      
925-667 A Livermore CA SNRFCA15DS0  722      
925-667 2 Livermore CA   722      
925-678 A Danville CA SNJSCAYBDS0  722      
925-678 1 Danville CA   722      
925-678 2 Danville CA   722      
925-678 3 Danville CA   722      
925-678 8 Danville CA   722      
925-678 9 Danville CA   722      
925-701 A Pleasanton CA SNJSCAYBGT0  722      
925-701 2 Pleasanton CA   722      
925-701 3 Pleasanton CA   722      
925-724 5 Livermore CA   722   2011-04-29   
925-771 A Concord CA SNRFCA15DS0  722      
925-771 1 Concord CA   722      
925-771 2 Concord CA   722      
925-771 3 Concord CA   722      
925-771 5 Concord CA   722      
925-771 6 Concord CA   722      
925-771 7 Concord CA   722      
925-771 8 Concord CA   722      
925-791 A Danville CA SNRFCA15DS0  722      
925-791 2 Danville CA   722      
925-791 4 Danville CA   722      
925-791 6 Danville CA   722      
925-809 A East Contra Costa CA SNJSCAYBDS0  722      
925-809 1 East Contra Costa CA   722      
925-809 3 East Contra Costa CA   722      
925-809 9 East Contra Costa CA   722      
925-835 A Sunol CA SNJSCAYBDS0  722      
925-835 9 Sunol CA   722      
925-839 A Martinez CA SNJSCAYBDS0  722      
925-839 2 Martinez CA   722      
925-839 9 Martinez CA   722      
925-844 A Clayton CA SNJSCAYBDS0  722      
925-844 9 Clayton CA   722      
925-849 A Concord CA SNJSCAYBDS0  722      
925-849 1 Concord CA   722      
925-849 3 Concord CA   722      
925-849 8 Concord CA   722      
925-849 9 Concord CA   722      

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Last updated: Sun, 31 May 2020 11:59:01 UTC

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