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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Switch: BISNSDXADS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
406-972 A West Camp Crook MT 1689 WEST RIVER COOPERATIVE TELEPHONE COMPANY 640      
605-244 A Bison SD 1689 WEST RIVER COOPERATIVE TELEPHONE COMPANY 640      
605-257 A Nisland SD 1689 WEST RIVER COOPERATIVE TELEPHONE COMPANY 640      
605-374 A Lemmon SD 1689 WEST RIVER COOPERATIVE TELEPHONE COMPANY 640      
605-375 A Buffalo SD 1689 WEST RIVER COOPERATIVE TELEPHONE COMPANY 640      
605-456 A Newell SD 1689 WEST RIVER COOPERATIVE TELEPHONE COMPANY 640      
605-788 A Meadow SD 1689 WEST RIVER COOPERATIVE TELEPHONE COMPANY 640      
605-797 A Camp Crook SD 1689 WEST RIVER COOPERATIVE TELEPHONE COMPANY 640      
605-866 A Sorum SD 1689 WEST RIVER COOPERATIVE TELEPHONE COMPANY 640      
701-376 A North Lemmon ND 1689 WEST RIVER COOPERATIVE TELEPHONE COMPANY 640      

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

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