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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Britton, SD

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
605-448 A BRTNSDXADS0  1680 VENTURE COMMUNICATIONS COOPERATIVE 640      
605-470 A SXFLSDCONMD  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 640      
605-470 0   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 640      
605-551 A SXFLSDCONMD  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 640      
605-551 5   145J TERRA NOVA TELECOM INC. 640   2025-08-01   
605-551 9   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 640   2010-12-20   

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

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