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: RPCYSDIPGT0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
605-443 A Spearfish SD 7076 MIDCONTINENT COMMUNICATIONS. - SD 640      
605-443 0 Spearfish SD 7076 MIDCONTINENT COMMUNICATIONS. - SD 640      
605-559 A Spearfish SD 7076 MIDCONTINENT COMMUNICATIONS. - SD 640      
605-561 A Sturgis SD 7076 MIDCONTINENT COMMUNICATIONS. - SD 640      
605-568 A Belle Fourche SD 7076 MIDCONTINENT COMMUNICATIONS. - SD 640      
605-571 A Spearfish SD 7076 MIDCONTINENT COMMUNICATIONS. - SD 640      
605-571 0 Spearfish SD 7076 MIDCONTINENT COMMUNICATIONS. - SD 640      
605-571 1 Spearfish SD 7076 MIDCONTINENT COMMUNICATIONS. - SD 640      
605-571 2 Spearfish SD 7076 MIDCONTINENT COMMUNICATIONS. - SD 640      
605-791 A Rapid City SD 7076 MIDCONTINENT COMMUNICATIONS. - SD 640      

Last updated: Wed, 04 Mar 2026 03:00:52 UTC

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