Local Calling Guide

Area code/prefix search

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Waterloo, IA

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NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
319-888 7 CDRRIADTX2X  508J CENTURYLINK COMMUNICATIONS, LLC 635   2017-06-16   
319-888 8 CDRRIADTKMD  221F ONVOY, LLC - IA 635   2017-10-08   
319-888 9 CDRRIADTUMD  8344 TELEPORT COMMUNICATIONS AMERICA, LLC - IA 635   2019-04-16   
319-939 A CDRRIATS0MD  6266 UNITED STATES CELLULAR - IA 635      
319-961 A CDRRIAAX7MD  6529 T-MOBILE USA, INC. 635      

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Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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