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: RPCYSD01DS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
605-716 A Rapid City SD 4256 CLARITY TELECOM, LLC DBA BLUEPEAK 640      
605-717 A Spearfish SD 4256 CLARITY TELECOM, LLC DBA BLUEPEAK 640      
605-718 A Rapid City SD 4256 CLARITY TELECOM, LLC DBA BLUEPEAK 640      
605-719 A Rapid City SD 4256 CLARITY TELECOM, LLC DBA BLUEPEAK 640      
605-720 A Sturgis SD 4256 CLARITY TELECOM, LLC DBA BLUEPEAK 640      
605-721 A Rapid City SD 4256 CLARITY TELECOM, LLC DBA BLUEPEAK 640      
605-722 A Spearfish SD 4256 CLARITY TELECOM, LLC DBA BLUEPEAK 640      
605-723 A Belle Fourche SD 4256 CLARITY TELECOM, LLC DBA BLUEPEAK 640      
605-755 A Rapid City SD 4256 CLARITY TELECOM, LLC DBA BLUEPEAK 640      

Last updated: Sat, 10 Oct 2026 15:24:20 UTC

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