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.

Switch: NWEFSDXADS1

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
605-398 A Summit SD 1674 RC TECHNOLOGIES 640      
605-434 A Milbank SD 683C RC COMMUNICATIONS, INC. - SD 640      
605-637 A New Effington SD 1674 RC TECHNOLOGIES 640      
605-652 A Claire City SD 1674 RC TECHNOLOGIES 640      
605-738 A Veblen SD 1674 RC TECHNOLOGIES 640      
605-818 A Watertown SD 683C RC COMMUNICATIONS, INC. - SD 640      
605-932 A Peever SD 1674 RC TECHNOLOGIES 640      
605-938 A Wilmot SD 1674 RC TECHNOLOGIES 640      
701-634 A North New Effington ND 1674 RC TECHNOLOGIES 640      
701-736 A North Veblen ND 1674 RC TECHNOLOGIES 640      

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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