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: CSTCCA11DS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
661-257 A Santa Clarita: Newhall-Castaic DA CA 9740 PACIFIC BELL 730      
661-294 A Santa Clarita: Newhall-Castaic DA CA 9740 PACIFIC BELL 730      
661-295 A Santa Clarita: Newhall-Castaic DA CA 9740 PACIFIC BELL 730      
661-383 A Santa Clarita: Newhall-Castaic DA CA 9740 PACIFIC BELL 730      
661-383 4 Santa Clarita: Newhall-Castaic DA CA 9740 PACIFIC BELL 730   2015-03-19   
661-383 5 Santa Clarita: Newhall-Castaic DA CA 9740 PACIFIC BELL 730   2015-03-19   
661-607 A Santa Clarita: Newhall-Castaic DA CA 9740 PACIFIC BELL 730      
661-607 0 Santa Clarita: Newhall-Castaic DA CA 9740 PACIFIC BELL 730      
661-702 A Santa Clarita: Newhall-Castaic DA CA 9740 PACIFIC BELL 730      
661-702 0 Santa Clarita: Newhall-Castaic DA CA 9740 PACIFIC BELL 730      
661-702 1 Santa Clarita: Newhall-Castaic DA CA 9740 PACIFIC BELL 730      
661-702 2 Santa Clarita: Newhall-Castaic DA CA 9740 PACIFIC BELL 730      
661-702 3 Santa Clarita: Newhall-Castaic DA CA 9740 PACIFIC BELL 730      
661-702 5 Santa Clarita: Newhall-Castaic DA CA 9740 PACIFIC BELL 730      
661-702 6 Santa Clarita: Newhall-Castaic DA CA 9740 PACIFIC BELL 730      
661-702 7 Santa Clarita: Newhall-Castaic DA CA 9740 PACIFIC BELL 730      
661-702 8 Santa Clarita: Newhall-Castaic DA CA 9740 PACIFIC BELL 730      
661-702 9 Santa Clarita: Newhall-Castaic DA CA 9740 PACIFIC BELL 730      
661-775 A Santa Clarita: Newhall-Castaic DA CA 9740 PACIFIC BELL 730      

Last updated: Tue, 16 Jun 2026 00:09:45 UTC

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