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.
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Switch: SXFLSDCOX6X

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
605-525 A Lake Preston SD 363J VALLEY COMMUNICATIONS, INC. D/B/A VALLEY FIBERCOM 640      
605-827 A Volga SD 363J VALLEY COMMUNICATIONS, INC. D/B/A VALLEY FIBERCOM 640      

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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