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.

Columbia, WA

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
509-377 A CLMAWAXARS0  4521 UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA 676      
509-377 0   4521 UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA 676      
509-377 1   4521 UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA 676      
509-377 2   4521 UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA 676      
509-377 3   4521 UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA 676      
509-377 4   4521 UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA 676      
509-377 5   483E ONVOY, LLC - WA 676   2022-10-16   
509-377 6   4521 UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA 676      
509-377 7   508J CENTURYLINK COMMUNICATIONS, LLC 676   2015-01-26   
509-377 8   4521 UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA 676      
509-377 9   4521 UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - WA 676      
509-776 A SPKNWA01XUX  6121 LEVEL 3 COMMUNICATIONS, LLC - WA 676      
509-776 0   6121 LEVEL 3 COMMUNICATIONS, LLC - WA 676      
509-776 6   483E ONVOY, LLC - WA 676   2021-06-26   
509-776 7   483E ONVOY, LLC - WA 676   2020-07-20   

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

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.