Local Calling Guide

Area code/prefix search

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

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
605-233 A SXFLSDCONMD  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 640      
605-233 0 SXFLSDCONMD  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 640      
605-233 1 SXFLSDCONMD  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 640      
605-233 2 SXFLSDPS5MD  145J TERRA NOVA TELECOM INC. 640   2026-04-30   
605-233 3 SXFLSDPSCMD  516J TON80 COMMUNICATIONS, LLC 640   2022-03-28   
605-532 A CLRKSDXADS0  1651 INTERSTATE TELECOM COOP, INC. - SD 640      
605-844 A SXFLSDCONMD  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 640      
605-844 4   145J TERRA NOVA TELECOM INC. 640   2025-08-01   
605-844 9 SXFLSDCONMD  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 640   2010-12-20   

Last updated: Sun, 01 Nov 2026 02:11:49 UTC

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