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: 510 [Rate centres in NPA 510] [Dial plan for NPA 510]

NXX: 307

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
510-307 A Richmond CA RCMDCA11DS0  9740 PACIFIC BELL 722      
510-307 0 Richmond CA RCMDCA11DS0  9740 PACIFIC BELL 722      
510-307 1 Richmond CA RCMDCA11DS0  9740 PACIFIC BELL 722      
510-307 2 Richmond CA RCMDCA11DS0  9740 PACIFIC BELL 722      
510-307 3 Richmond CA RCMDCA11DS0  9740 PACIFIC BELL 722      
510-307 4 Richmond CA RCMDCA11DS0  9740 PACIFIC BELL 722      
510-307 5 Richmond CA OKLDCA03XOY  318J COMCAST IP PHONE, LLC 722      
510-307 6 Richmond CA OKLECAZVGT0  6529 T-MOBILE USA, INC. 722      
510-307 7 Richmond CA RCMDCA11DS0  9740 PACIFIC BELL 722      
510-307 8 Richmond CA RCMDCA11DS0  9740 PACIFIC BELL 722      
510-307 9 Richmond CA RCMDCA11DS0  9740 PACIFIC BELL 722      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.