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: 831 [Rate centres in NPA 831] [Dial plan for NPA 831]

NXX: 339

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
831-339 A Gonzales CA SLNSCABIXMD  6010 NEW CINGULAR WIRELESS PCS, LLC 736   2025-11-01   
831-339 4 Gonzales CA SLNSCA01XAY  073H TELNYX LLC 736   2025-11-03   
831-339 8 Gonzales CA MTRYCAPMDS0  373F PEERLESS NETWORK OF CALIFORNIA, LLC - CA 736   2026-04-19   
831-339 9 Gonzales CA SLNSCABIXMD  6010 NEW CINGULAR WIRELESS PCS, LLC 736   2025-11-01   

Last updated: Thu, 16 Jul 2026 02:21:55 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.