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: 209 [Rate centres in NPA 209] [Dial plan for NPA 209]

NXX: 831

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
209-831 A Tracy CA TRACCA11RS2  9740 PACIFIC BELL 738      
209-831 0 Tracy CA   6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 738   2011-12-08   
209-831 1 Tracy CA   9740 PACIFIC BELL 738      
209-831 2 Tracy CA   981E BANDWIDTH.COM CLEC, LLC - CA 738   2011-08-12   
209-831 3 Tracy CA   981E BANDWIDTH.COM CLEC, LLC - CA 738   2011-05-07   
209-831 4 Tracy CA   9740 PACIFIC BELL 738      
209-831 5 Tracy CA   9740 PACIFIC BELL 738      
209-831 6 Tracy CA   9740 PACIFIC BELL 738      
209-831 7 Tracy CA   649C ONVOY, LLC - CA 738   2011-05-05   
209-831 8 Tracy CA   981E BANDWIDTH.COM CLEC, LLC - CA 738   2011-07-24   
209-831 9 Tracy CA   318J COMCAST IP PHONE, LLC 738   2011-10-01   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.