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: SXFLSDPSCMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
605-634 A Cavour SD 516J TON80 COMMUNICATIONS, LLC 640      
605-746 A Platte SD 516J TON80 COMMUNICATIONS, LLC 640      
605-752 A Fort Thompson SD 516J TON80 COMMUNICATIONS, LLC 640      
605-898 A Iroquois SD 516J TON80 COMMUNICATIONS, LLC 640      
605-909 A Hill City SD 516J TON80 COMMUNICATIONS, LLC 640      
605-982 A Aberdeen SD 516J TON80 COMMUNICATIONS, LLC 640      

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

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