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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Switch: HRCLCA11DS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
510-245 A Hercules-Rodeo CA 9740 PACIFIC BELL 722      
510-408 A El Sobrante-Pinole CA 9740 PACIFIC BELL 722   2009-12-25   
510-724 A El Sobrante-Pinole CA 9740 PACIFIC BELL 722      
510-741 A El Sobrante-Pinole CA 9740 PACIFIC BELL 722      
510-799 A Hercules-Rodeo CA 9740 PACIFIC BELL 722      
510-964 A El Sobrante-Pinole CA 9740 PACIFIC BELL 722      

Last updated: Sat, 11 Jul 2020 20:37:26 UTC

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