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.

Wasco, OR

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
541-442 A WASCORXARS0  4520 UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 672      
541-442 0   4520 UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 672      
541-442 1   3234 LEVEL 3 COMMUNICATIONS, LLC - OR 672   2023-02-23   
541-442 2   750E ONVOY, LLC - OR 672   2021-04-04   
541-442 3   4520 UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 672      
541-442 4   750E ONVOY, LLC - OR 672   2018-11-10   
541-442 5   4520 UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 672      
541-442 6   4520 UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 672      
541-442 7   508J CENTURYLINK COMMUNICATIONS, LLC 672   2013-12-10   
541-442 8   4520 UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 672      
541-442 9   4520 UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 672      

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

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.