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.

Walhalla, ND

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
701-549 A LNGDNDXADS2  1636 UNITED TEL. MUTUAL AID CORP. 636      
701-821 A DVLKND13GT0  3065 MIDCONTINENT COMMUNICATIONS - ND 636      
701-821 0   3065 MIDCONTINENT COMMUNICATIONS - ND 636      
701-821 1   3065 MIDCONTINENT COMMUNICATIONS - ND 636      
701-821 2   3065 MIDCONTINENT COMMUNICATIONS - ND 636      
701-821 3   3065 MIDCONTINENT COMMUNICATIONS - ND 636      
701-821 5   3065 MIDCONTINENT COMMUNICATIONS - ND 636      

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

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.