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: LSANCA35DS1

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
323-278 A Montebello CA 9740 PACIFIC BELL 730      
323-720 A Montebello CA 9740 PACIFIC BELL 730      
323-721 A Montebello CA 9740 PACIFIC BELL 730      
323-723 A Los Angeles: DA 05 CA 9740 PACIFIC BELL 730      
323-725 A Montebello CA 9740 PACIFIC BELL 730      
323-726 A Montebello CA 9740 PACIFIC BELL 730      
323-727 A Montebello CA 9740 PACIFIC BELL 730      
323-728 A Montebello CA 9740 PACIFIC BELL 730      
323-837 A Montebello CA 9740 PACIFIC BELL 730      
323-888 A Montebello CA 9740 PACIFIC BELL 730      
323-889 A Montebello CA 9740 PACIFIC BELL 730      

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

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