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: SXFLSDPS5MD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
307-446 6 West Spearfish WY 145J TERRA NOVA TELECOM INC. 640      
605-210 8 Belle Fourche SD 145J TERRA NOVA TELECOM INC. 640      
605-468 0 Redfield SD 145J TERRA NOVA TELECOM INC. 640      
605-499 1 Sturgis SD 145J TERRA NOVA TELECOM INC. 640      
605-580 9 Spearfish SD 145J TERRA NOVA TELECOM INC. 640      
605-639 8 Spearfish SD 145J TERRA NOVA TELECOM INC. 640      
605-670 4 Vermillion SD 145J TERRA NOVA TELECOM INC. 640      
605-800 A Sioux Falls SD 145J TERRA NOVA TELECOM INC. 640      
605-931 1 Huron SD 145J TERRA NOVA TELECOM INC. 640      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

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