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: SXFLSDCORMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
402-882 A South Yankton NE 3233 LEVEL 3 COMMUNICATIONS, LLC - NE 640      
605-277 A Aberdeen SD 5180 LEVEL 3 COMMUNICATIONS, LLC - SD 640      
605-299 A Mitchell SD 5180 LEVEL 3 COMMUNICATIONS, LLC - SD 640      
605-413 A Sioux Falls SD 5180 LEVEL 3 COMMUNICATIONS, LLC - SD 640      
605-415 A Rapid City SD 5180 LEVEL 3 COMMUNICATIONS, LLC - SD 640      
605-550 A Mitchell SD 5180 LEVEL 3 COMMUNICATIONS, LLC - SD 640      
605-593 A Rapid City SD 5180 LEVEL 3 COMMUNICATIONS, LLC - SD 640      
605-609 A Pierre SD 5180 LEVEL 3 COMMUNICATIONS, LLC - SD 640      
605-610 A Sioux Falls SD 5180 LEVEL 3 COMMUNICATIONS, LLC - SD 640      
712-394 A Beloit IA 9877 LEVEL 3 COMMUNICATIONS, LLC - IA 640      

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

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