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: 337

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
510-337 A Oakland: Alameda DA CA ALMDCA11DS0  9740 PACIFIC BELL 722      
510-337 0 Oakland: Alameda DA CA   9740 PACIFIC BELL 722      
510-337 1 Oakland: Alameda DA CA   9740 PACIFIC BELL 722      
510-337 2 Oakland: Alameda DA CA   9740 PACIFIC BELL 722      
510-337 3 Oakland: Alameda DA CA   9740 PACIFIC BELL 722      
510-337 4 Oakland: Alameda DA CA   649C ONVOY, LLC - CA 722   2009-01-14   
510-337 5 Oakland: Alameda DA CA   9740 PACIFIC BELL 722      
510-337 6 Oakland: Alameda DA CA   9740 PACIFIC BELL 722      
510-337 7 Oakland: Alameda DA CA   9740 PACIFIC BELL 722      
510-337 8 Oakland: Alameda DA CA   9740 PACIFIC BELL 722      
510-337 9 Oakland: Alameda DA CA   9740 PACIFIC BELL 722      

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.