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.

OCN: 1647 CHEYENNE RIVER SIOUX TRIBAL TEL. AUTHORITY

NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
605-365 A Dupree SD EGBTSDXA964  640      
605-466 A Isabel SD EGBTSDXA964  640      
605-538 A Dupree SD EGBTSDXA964  640      
605-733 A Laplant SD EGBTSDXA964  640      
605-964 A Eagle Butte SD EGBTSDXA964  640      

Last updated: Sat, 15 Nov 2025 03:38:44 UTC

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