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: COLACA01DS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
650-301 A San Francisco: Juniper DA CA 9740 PACIFIC BELL 722      
650-466 A San Francisco: Juniper DA CA 9740 PACIFIC BELL 722      
650-550 A San Francisco: Juniper DA CA 9740 PACIFIC BELL 722      
650-746 A San Francisco: Juniper DA CA 9740 PACIFIC BELL 722      
650-754 A South San Francisco CA 9740 PACIFIC BELL 722      
650-755 A San Francisco: Juniper DA CA 9740 PACIFIC BELL 722      
650-756 A San Francisco: Juniper DA CA 9740 PACIFIC BELL 722      
650-757 A San Francisco: Juniper DA CA 9740 PACIFIC BELL 722      
650-758 A San Francisco: Juniper DA CA 9740 PACIFIC BELL 722      
650-878 A South San Francisco CA 9740 PACIFIC BELL 722      
650-985 A San Francisco: Juniper DA CA 9740 PACIFIC BELL 722      
650-991 A San Francisco: Juniper DA CA 9740 PACIFIC BELL 722      
650-992 A San Francisco: Juniper DA CA 9740 PACIFIC BELL 722      
650-994 A San Francisco: Juniper DA CA 9740 PACIFIC BELL 722      
650-997 A San Francisco: Juniper DA CA 9740 PACIFIC BELL 722      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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