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: 341 [Rate centres in NPA 341] [Dial plan for NPA 341]

Block: A

<< 1 2

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
341-888 A Fremont-Newark: Main DA CA SNFCCA21XCZ  252F WIDE VOICE, LLC - CA 722      
341-895 A Oakland: Alameda DA CA SNFCCAMKDS3  649C ONVOY, LLC - CA 722      
341-899 A Oakland: Trinidad DA CA SNJUCACL7MD  965H FRACTEL, LLC 722      
341-900 A Crockett CA SNJUCACL7MD  965H FRACTEL, LLC 722      
341-946 A Oakland: Berkeley DA CA SNJUCACL7MD  965H FRACTEL, LLC 722      
341-999 A Richmond CA SNJUCACL7MD  965H FRACTEL, LLC 722      

<< 1 2

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.