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: SXFLSDPSDS1

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
605-307 A Hill City SD 580H AIRUS, INC. - SD 640      
605-315 A Arlington SD 580H AIRUS, INC. - SD 640      
605-316 A Iroquois SD 580H AIRUS, INC. - SD 640      
605-640 A McIntosh SD 580H AIRUS, INC. - SD 640      
605-663 A Huron SD 580H AIRUS, INC. - SD 640      
605-799 A Sioux Falls SD 580H AIRUS, INC. - SD 640      
605-815 A Chamberlain SD 580H AIRUS, INC. - SD 640      
605-991 A Milbank SD 580H AIRUS, INC. - SD 640      

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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