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.

NPA: 818 [Rate centres in NPA 818] [Dial plan for NPA 818]

NXX: 678

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
818-678 A Northridge CA NORGCA11DS0  9740 PACIFIC BELL 730      
818-678 0 Northridge CA   9740 PACIFIC BELL 730      
818-678 1 Northridge CA   9740 PACIFIC BELL 730      
818-678 2 Northridge CA   9740 PACIFIC BELL 730      
818-678 3 Northridge CA   9740 PACIFIC BELL 730      
818-678 4 Northridge CA   9740 PACIFIC BELL 730      
818-678 5 Northridge CA   9740 PACIFIC BELL 730      
818-678 6 Northridge CA   9740 PACIFIC BELL 730      
818-678 7 Northridge CA   9740 PACIFIC BELL 730      
818-678 8 Northridge CA   9740 PACIFIC BELL 730      
818-678 9 Northridge CA   576C TIME WARNER CBL INFO SVCS (CA) DBA TIME WARNER CAB 730   2007-01-10   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.