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: VRMLSDCODS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
605-624 A Vermillion SD 9631 QWEST CORPORATION 640      
605-638 A Vermillion SD 9631 QWEST CORPORATION 640      
605-638 0 Vermillion SD 9631 QWEST CORPORATION 640      
605-638 1 Vermillion SD 9631 QWEST CORPORATION 640      
605-638 8 Vermillion SD 9631 QWEST CORPORATION 640      
605-677 A Vermillion SD 9631 QWEST CORPORATION 640      
605-677 3 Vermillion SD 9631 QWEST CORPORATION 640      
605-677 4 Vermillion SD 9631 QWEST CORPORATION 640      
605-677 5 Vermillion SD 9631 QWEST CORPORATION 640      
605-677 6 Vermillion SD 9631 QWEST CORPORATION 640      
605-677 7 Vermillion SD 9631 QWEST CORPORATION 640      
605-677 8 Vermillion SD 9631 QWEST CORPORATION 640      

Last updated: Tue, 31 Mar 2026 13:56:49 UTC

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