Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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Denmark, IA

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
319-528 A DNMKIAXORS0  1178 WINDSTREAM IOWA COMMUNICATIONS, INC. 634      
319-528 0   1178 WINDSTREAM IOWA COMMUNICATIONS, INC. 634      
319-528 1   1178 WINDSTREAM IOWA COMMUNICATIONS, INC. 634      
319-528 2   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 634   2017-03-15   
319-528 3   9877 LEVEL 3 COMMUNICATIONS, LLC - IA 634   2022-02-02   
319-528 4   1178 WINDSTREAM IOWA COMMUNICATIONS, INC. 634      
319-528 5   221F ONVOY, LLC - IA 634   2020-06-27   
319-528 6   1178 WINDSTREAM IOWA COMMUNICATIONS, INC. 634      
319-528 7   508J CENTURYLINK COMMUNICATIONS, LLC 634   2016-10-05   
319-528 8   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 634   2015-05-29   
319-528 9   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 634   2019-07-02   
319-742 A DVNPIADTXZX  516J TON80 COMMUNICATIONS, LLC 634      
319-742 2   624H ONVOY SPECTRUM, LLC 634   2024-12-19   
319-742 6   516J TON80 COMMUNICATIONS, LLC 634   2022-04-25   

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

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