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: HTSPSDXADS2

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
605-673 A Custer SD 1686 VIVIAN TEL CO DBA GOLDEN WEST TELECOMMUNICATIONS 640      

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

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