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.

Diamond Lake, OR

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
541-793 A DMLKORXXRS0  4520 UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 670      
541-793 0 DMLKORXXRS0  4520 UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 670      
541-793 3 DMLKORXXRS0  4520 UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 670      
541-793 4 EUGNOR53QMD  3234 LEVEL 3 COMMUNICATIONS, LLC - OR 670   2023-02-20   
541-793 5 WHCYORXXDMD  750E ONVOY, LLC - OR 670   2021-08-13   
541-793 8 DMLKORXXRS0  4520 UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 670      
541-793 9 DMLKORXXRS0  4520 UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 670      

Last updated: Sat, 10 Oct 2026 15:24:20 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.