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: SXFLSDPSDS1

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
605-960 2 Huron SD 580H AIRUS, INC. - SD 640   2018-03-01   
605-961 2 Sioux Falls SD 580H AIRUS, INC. - SD 640   2018-12-22   
605-961 9 Sioux Falls SD 580H AIRUS, INC. - SD 640   2020-06-19   
605-971 9 Aberdeen SD 580H AIRUS, INC. - SD 640   2021-03-01   
605-991 A Milbank SD 580H AIRUS, INC. - SD 640      
605-991 1 Milbank SD 580H AIRUS, INC. - SD 640   2021-05-22   

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Last updated: Tue, 29 Sep 2026 03:00:13 UTC

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