Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 319 [Rate centres in NPA 319] [Dial plan for NPA 319]

NXX: 421

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
319-421 A Shell Rock IA NLBTIAXO2MD  593K MCC TELEPHONY LLC 635      
319-421 1 Shell Rock IA   544H INTEGRATED PATH COMMUNCATIONS, LLC - IA 635   2018-05-14   
319-421 2 Shell Rock IA   490J DISH WIRELESS, LLC 635   2023-07-23   
319-421 4 Shell Rock IA   9877 LEVEL 3 COMMUNICATIONS, LLC - IA 635   2022-11-10   
319-421 8 Shell Rock IA   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 635   2021-03-10   
319-421 9 Shell Rock IA   593K MCC TELEPHONY LLC 635   2010-05-09   

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

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