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: RCMDCA11DS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
510-215 A Richmond CA 9740 PACIFIC BELL 722      
510-231 A Richmond CA 9740 PACIFIC BELL 722      
510-232 A Richmond CA 9740 PACIFIC BELL 722      
510-233 A Richmond CA 9740 PACIFIC BELL 722      
510-234 A Richmond CA 9740 PACIFIC BELL 722      
510-235 A Richmond CA 9740 PACIFIC BELL 722      
510-236 A Richmond CA 9740 PACIFIC BELL 722      
510-237 A Richmond CA 9740 PACIFIC BELL 722      
510-242 A Richmond CA 9740 PACIFIC BELL 722      
510-307 A Richmond CA 9740 PACIFIC BELL 722      
510-412 A Richmond CA 9740 PACIFIC BELL 722      
510-529 A Oakland: Berkeley DA CA 9740 PACIFIC BELL 722      
510-620 A Richmond CA 9740 PACIFIC BELL 722      
510-965 A Richmond CA 9740 PACIFIC BELL 722      
510-970 A Richmond CA 9740 PACIFIC BELL 722      

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

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