Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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Clayton, IL

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
217-812 A GLDNILAADS0  7091 ADAMS TELSYSTEMS, INC. 376      
217-894 A CYTNILXCRS0  1015 FRONTIER NORTH, INC. - IL 376      
217-894 2   1015 FRONTIER NORTH, INC. - IL 376      
217-894 3   624H ONVOY SPECTRUM, LLC 376   2023-07-07   
217-894 4   224C ONVOY, LLC 376   2021-04-05   
217-894 6   1015 FRONTIER NORTH, INC. - IL 376      
217-894 7   1015 FRONTIER NORTH, INC. - IL 376      
217-894 8   224C ONVOY, LLC 376   2020-04-19   

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

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