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: FRFDCA01DS1

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
707-399 A Fairfield-Suisun CA 9740 PACIFIC BELL 722      
707-420 A Fairfield-Suisun CA 9740 PACIFIC BELL 722      
707-421 A Fairfield-Suisun CA 9740 PACIFIC BELL 722      
707-422 A Fairfield-Suisun CA 9740 PACIFIC BELL 722      
707-423 A Fairfield-Suisun CA 9740 PACIFIC BELL 722      
707-424 A Fairfield-Suisun CA 9740 PACIFIC BELL 722      
707-425 A Fairfield-Suisun CA 9740 PACIFIC BELL 722      
707-426 A Fairfield-Suisun CA 9740 PACIFIC BELL 722      
707-427 A Fairfield-Suisun CA 9740 PACIFIC BELL 722      
707-428 A Fairfield-Suisun CA 9740 PACIFIC BELL 722      
707-429 A Fairfield-Suisun CA 9740 PACIFIC BELL 722      
707-432 A Fairfield-Suisun CA 9740 PACIFIC BELL 722      
707-434 A Fairfield-Suisun CA 9740 PACIFIC BELL 722      
707-435 A Fairfield-Suisun CA 9740 PACIFIC BELL 722      
707-436 A Fairfield-Suisun CA 9740 PACIFIC BELL 722      
707-438 A Fairfield-Suisun CA 9740 PACIFIC BELL 722      
707-784 A Fairfield-Suisun CA 9740 PACIFIC BELL 722      

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

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.