Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 312 [Rate centres in NPA 312] [Dial plan for NPA 312]

NXX:

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
312-661 A Chicago Zone 01-Illinois Dearborn IL CHCGILIDDS2  9329 AMERITECH ILLINOIS 358      
312-661 0 Chicago Zone 01-Illinois Dearborn IL   9329 AMERITECH ILLINOIS 358      
312-661 1 Chicago Zone 01-Illinois Dearborn IL   9329 AMERITECH ILLINOIS 358      
312-661 2 Chicago Zone 01-Illinois Dearborn IL   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2013-02-08   
312-661 3 Chicago Zone 01-Illinois Dearborn IL   9329 AMERITECH ILLINOIS 358      
312-661 4 Chicago Zone 01-Illinois Dearborn IL   9329 AMERITECH ILLINOIS 358      
312-661 5 Chicago Zone 01-Illinois Dearborn IL   984E BANDWIDTH.COM CLEC, LLC - IL 358   2014-05-24   
312-661 6 Chicago Zone 01-Illinois Dearborn IL   6664 SPRINT SPECTRUM L.P. 358   2011-05-26   
312-661 7 Chicago Zone 01-Illinois Dearborn IL   9329 AMERITECH ILLINOIS 358      
312-661 8 Chicago Zone 01-Illinois Dearborn IL   9329 AMERITECH ILLINOIS 358      
312-661 9 Chicago Zone 01-Illinois Dearborn IL   9329 AMERITECH ILLINOIS 358      

Last updated: Sun, 10 Nov 2019 13:49:34 UTC

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