Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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Parkston, SD

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
605-505 A SXFLSDCONMD  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 640      
605-505 0   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 640   2005-12-26   
605-505 1   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 640   2010-11-15   
605-505 5   145J TERRA NOVA TELECOM INC. 640   2025-08-01   
605-928 A WNSCSDXADS0  1676 SANTEL COMMUNICATIONS COOPERATIVE, INC. - SD 640      

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

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