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: OKLDCA13DS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
510-336 A Oakland: Fruitvale DA CA 9740 PACIFIC BELL 722      
510-338 A Oakland: Main-Piedmont DA CA 9740 PACIFIC BELL 722      
510-339 A Oakland: Main-Piedmont DA CA 9740 PACIFIC BELL 722      
510-482 A Oakland: Fruitvale DA CA 9740 PACIFIC BELL 722      
510-530 A Oakland: Fruitvale DA CA 9740 PACIFIC BELL 722      
510-531 A Oakland: Fruitvale DA CA 9740 PACIFIC BELL 722      

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

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