Local Calling Guide

Area code/prefix search

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

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NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
641-990 7 CNVLIABC1MD  6266 UNITED STATES CELLULAR - IA 632      
641-990 8 CNVLIABC1MD  6266 UNITED STATES CELLULAR - IA 632   2003-06-24   
641-990 9 CNVLIABC1MD  6266 UNITED STATES CELLULAR - IA 632   2004-02-10   

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Last updated: Tue, 31 Mar 2026 13:56:49 UTC

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