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: 509 [Rate centres in NPA 509] [Dial plan for NPA 509]

NXX: 923

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
509-923 A Pateros WA PTRSWA01DS0  9638 QWEST CORPORATION 676      
509-923 0 Pateros WA   9638 QWEST CORPORATION 676      
509-923 1 Pateros WA   9638 QWEST CORPORATION 676      
509-923 2 Pateros WA   9638 QWEST CORPORATION 676      
509-923 3 Pateros WA   483E ONVOY, LLC - WA 676   2017-10-01   
509-923 5 Pateros WA   483E ONVOY, LLC - WA 676   2021-06-27   
509-923 6 Pateros WA   145J TERRA NOVA TELECOM INC. 676   2023-08-29   
509-923 7 Pateros WA   483E ONVOY, LLC - WA 676   2007-03-23   
509-923 8 Pateros WA   483E ONVOY, LLC - WA 676   2021-11-20   
509-923 9 Pateros WA   6121 LEVEL 3 COMMUNICATIONS, LLC - WA 676      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.