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.
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OCN: 1491 TWIN VALLEY-ULEN TEL. CO., INC.

NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
218-356 A Gary MN GARYMNXGRS0  636      
218-473 A Waubun MN WABNMNXWRS0  636      
218-567 A Flom MN FLOMMNXFRS0  636      
218-584 A Twin Valley MN TWVYMNXTRS0  636      
218-596 A Ulen MN ULENMNXURS0  636      
218-734 A Waubun MN WABNMNXWRS0  636      
218-983 A White Earth MN WHERMNXWRS0  636      

Last updated: Sun, 07 Dec 2025 22:02:11 UTC

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