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.

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
307-405 A West Belle Fourche WY 450F ONVOY, LLC - WY 640      
307-407 A West Spearfish WY 450F ONVOY, LLC - WY 640      
307-446 A West Spearfish WY 450F ONVOY, LLC - WY 640      
307-785 A West Belle Fourche WY 450F ONVOY, LLC - WY 640      
531-221 A South Yankton NE 549E ONVOY, LLC - NE 640      
605-250 A Sioux Falls SD 162G ONVOY, LLC - SD 640      
605-405 A Arlington SD 162G ONVOY, LLC - SD 640      
605-496 A Sioux Falls SD 162G ONVOY, LLC - SD 640      
605-566 A Spearfish SD 162G ONVOY, LLC - SD 640      
605-605 A Aberdeen SD 162G ONVOY, LLC - SD 640      
605-620 A Lake Preston SD 162G ONVOY, LLC - SD 640      
605-657 A Watertown SD 162G ONVOY, LLC - SD 640      
605-808 A Redfield SD 162G ONVOY, LLC - SD 640      
605-888 A Chamberlain SD 162G ONVOY, LLC - SD 640      
605-905 A Sturgis SD 162G ONVOY, LLC - SD 640      
605-910 A Sioux Falls SD 162G ONVOY, LLC - SD 640      
605-975 A Yankton SD 162G ONVOY, LLC - SD 640      
605-998 A Miller SD 162G ONVOY, LLC - SD 640      
701-937 A North Morristown ND 452F ONVOY, LLC - ND 640      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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