Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 605 [Rate centres in NPA 605] [Dial plan for NPA 605]

NXX: 478

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
605-478 A Highmore SD SXFLSDCONMD  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 640      
605-478 0 Highmore SD   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 640   2005-06-14   
605-478 1 Highmore SD   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 640   2010-11-15   
605-478 7 Highmore SD   516J TON80 COMMUNICATIONS, LLC 640   2022-04-21   

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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