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:

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
510-620 A Richmond CA RCMDCA11DS0  9740 PACIFIC BELL 722      
510-620 0 Richmond CA   9740 PACIFIC BELL 722      
510-620 1 Richmond CA   9740 PACIFIC BELL 722      
510-620 2 Richmond CA   9740 PACIFIC BELL 722      
510-620 3 Richmond CA   9740 PACIFIC BELL 722      
510-620 4 Richmond CA   6010 NEW CINGULAR WIRELESS PCS, LLC 722   2006-10-07   
510-620 5 Richmond CA   9740 PACIFIC BELL 722      
510-620 6 Richmond CA   9740 PACIFIC BELL 722      
510-620 7 Richmond CA   9262 UTILITY TELECOM GROUP, LLC - CA 722      
510-620 8 Richmond CA   9740 PACIFIC BELL 722      
510-620 9 Richmond CA   9740 PACIFIC BELL 722      

Last updated: Thu, 10 Sep 2020 02:15:24 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.