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: NHLLCA01DS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
661-200 A Santa Clarita: Newhall-Castaic DA CA 9740 PACIFIC BELL 730      
661-222 A Santa Clarita: Newhall-Castaic DA CA 9740 PACIFIC BELL 730      
661-253 A Santa Clarita: Newhall-Castaic DA CA 9740 PACIFIC BELL 730      
661-254 A Santa Clarita: Newhall-Castaic DA CA 9740 PACIFIC BELL 730      
661-255 A Santa Clarita: Newhall-Castaic DA CA 9740 PACIFIC BELL 730      
661-259 A Santa Clarita: Newhall-Castaic DA CA 9740 PACIFIC BELL 730      
661-260 A Santa Clarita: Newhall-Castaic DA CA 9740 PACIFIC BELL 730      
661-284 A Santa Clarita: Newhall-Castaic DA CA 9740 PACIFIC BELL 730      
661-286 A Santa Clarita: Newhall-Castaic DA CA 9740 PACIFIC BELL 730      
661-287 A Santa Clarita: Newhall-Castaic DA CA 9740 PACIFIC BELL 730      
661-288 A Santa Clarita: Newhall-Castaic DA CA 9740 PACIFIC BELL 730      
661-290 A Santa Clarita: Newhall-Castaic DA CA 9740 PACIFIC BELL 730      
661-291 A Santa Clarita: Newhall-Castaic DA CA 9740 PACIFIC BELL 730      
661-753 A Santa Clarita: Newhall-Castaic DA CA 9740 PACIFIC BELL 730      
661-799 A Santa Clarita: Newhall-Castaic DA CA 9740 PACIFIC BELL 730      
661-974 A Lancaster CA 7480 PACIFIC BELL (COMPETITIVE) 730      

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

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