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: SNFCCA04DS1

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
415-252 A San Francisco: Central DA CA 9740 PACIFIC BELL 722      
415-255 A San Francisco: Central DA CA 9740 PACIFIC BELL 722      
415-503 A San Francisco: Central DA CA 9740 PACIFIC BELL 722      
415-552 A San Francisco: Central DA CA 9740 PACIFIC BELL 722      
415-553 A San Francisco: Central DA CA 9740 PACIFIC BELL 722      
415-558 A San Francisco: Central DA CA 9740 PACIFIC BELL 722      
415-575 A San Francisco: Central DA CA 9740 PACIFIC BELL 722      
415-621 A San Francisco: Central DA CA 9740 PACIFIC BELL 722      
415-626 A San Francisco: Central DA CA 9740 PACIFIC BELL 722      
415-734 A San Francisco: Central DA CA 9740 PACIFIC BELL 722      
415-832 A San Francisco: Central DA CA 9740 PACIFIC BELL 722      
415-861 A San Francisco: Central DA CA 9740 PACIFIC BELL 722      
415-863 A San Francisco: Central DA CA 9740 PACIFIC BELL 722      
415-864 A San Francisco: Central DA CA 9740 PACIFIC BELL 722      
415-865 A San Francisco: Central DA CA 9740 PACIFIC BELL 722      
628-242 A San Francisco: Central DA CA 9740 PACIFIC BELL 722      

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

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