Local Calling Guide

Area code/prefix search

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NPA: 312 [Rate centres in NPA 312] [Dial plan for NPA 312]

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NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
312-227 5 Chicago Zone 01-Calumet IL   9329 AMERITECH ILLINOIS 358   2010-10-15   
312-227 6 Chicago Zone 01-Calumet IL   9329 AMERITECH ILLINOIS 358   2010-10-15   
312-227 7 Chicago Zone 01-Calumet IL   9329 AMERITECH ILLINOIS 358   2010-10-15   
312-227 8 Chicago Zone 01-Calumet IL   9329 AMERITECH ILLINOIS 358   2010-10-15   
312-227 9 Chicago Zone 01-Calumet IL   9329 AMERITECH ILLINOIS 358   2010-10-15   
312-228 A Chicago Zone 01-Lakeshore IL CHCGILLRDS0  9329 AMERITECH ILLINOIS 358      
312-229 A Chicago Zone 01-Illinois Dearborn IL CHCGILIDDS0  9329 AMERITECH ILLINOIS 358      
312-229 0 Chicago Zone 01-Illinois Dearborn IL   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2008-06-06   
312-229 1 Chicago Zone 01-Illinois Dearborn IL   7765 OVATION COMMUNICATIONS OF ILLINOIS, INC. 358   2000-03-10   
312-229 2 Chicago Zone 01-Illinois Dearborn IL   9329 AMERITECH ILLINOIS 358      
312-229 3 Chicago Zone 01-Illinois Dearborn IL   9329 AMERITECH ILLINOIS 358      
312-229 4 Chicago Zone 01-Illinois Dearborn IL   7765 OVATION COMMUNICATIONS OF ILLINOIS, INC. 358   2000-03-10   
312-229 5 Chicago Zone 01-Illinois Dearborn IL   7765 OVATION COMMUNICATIONS OF ILLINOIS, INC. 358   2000-03-10   
312-229 6 Chicago Zone 01-Illinois Dearborn IL   7765 OVATION COMMUNICATIONS OF ILLINOIS, INC. 358   2000-03-10   
312-229 7 Chicago Zone 01-Illinois Dearborn IL   7765 OVATION COMMUNICATIONS OF ILLINOIS, INC. 358   2000-03-10   
312-229 8 Chicago Zone 01-Illinois Dearborn IL   9329 AMERITECH ILLINOIS 358      
312-229 9 Chicago Zone 01-Illinois Dearborn IL   4717 PAETEC COMMUNICATIONS, INC. - IL 358   2008-07-02   
312-230 A Chicago Zone 01-Franklin IL CHCGILFRDS0  9329 AMERITECH ILLINOIS 358      
312-230 0 Chicago Zone 01-Franklin IL   9329 AMERITECH ILLINOIS 358      
312-230 1 Chicago Zone 01-Franklin IL   9329 AMERITECH ILLINOIS 358      
312-230 2 Chicago Zone 01-Franklin IL   9329 AMERITECH ILLINOIS 358      
312-230 3 Chicago Zone 01-Franklin IL   9329 AMERITECH ILLINOIS 358      
312-230 4 Chicago Zone 01-Franklin IL   9329 AMERITECH ILLINOIS 358      
312-230 5 Chicago Zone 01-Franklin IL   9329 AMERITECH ILLINOIS 358      
312-230 6 Chicago Zone 01-Franklin IL   9329 AMERITECH ILLINOIS 358      
312-230 7 Chicago Zone 01-Franklin IL   9329 AMERITECH ILLINOIS 358      
312-230 8 Chicago Zone 01-Franklin IL   5562 METRO PCS, INC. 358   2016-02-15   
312-230 9 Chicago Zone 01-Franklin IL   9329 AMERITECH ILLINOIS 358      
312-231 A Schaumburg IL SCBGILRRGT1  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358      
312-232 A Chicago Zone 01-Wabash IL CHCGILBWCM2  9748 AMERICAN MESSAGING SERVICES, LLC 358      
312-233 A Chicago Zone 01-Lakeshore IL CHCGILLRDS0  9329 AMERITECH ILLINOIS 358      
312-233 0 Chicago Zone 01-Lakeshore IL   9329 AMERITECH ILLINOIS 358      
312-233 1 Chicago Zone 01-Lakeshore IL   9329 AMERITECH ILLINOIS 358      
312-233 2 Chicago Zone 01-Lakeshore IL   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2005-12-08   
312-233 3 Chicago Zone 01-Lakeshore IL   9329 AMERITECH ILLINOIS 358      
312-233 4 Chicago Zone 01-Lakeshore IL   9329 AMERITECH ILLINOIS 358      
312-233 5 Chicago Zone 01-Lakeshore IL   9329 AMERITECH ILLINOIS 358      
312-233 6 Chicago Zone 01-Lakeshore IL   9329 AMERITECH ILLINOIS 358      
312-233 7 Chicago Zone 01-Lakeshore IL   9329 AMERITECH ILLINOIS 358      
312-233 8 Chicago Zone 01-Lakeshore IL   9329 AMERITECH ILLINOIS 358      
312-233 9 Chicago Zone 01-Lakeshore IL   9329 AMERITECH ILLINOIS 358      
312-234 A Chicago Zone 01-Canal IL CHCGILCLDS3  9329 AMERITECH ILLINOIS 358      
312-234 0 Chicago Zone 01-Canal IL   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2008-03-13   
312-234 1 Chicago Zone 01-Canal IL   9329 AMERITECH ILLINOIS 358      
312-234 2 Chicago Zone 01-Canal IL   9329 AMERITECH ILLINOIS 358      
312-234 3 Chicago Zone 01-Canal IL   9329 AMERITECH ILLINOIS 358      
312-234 4 Chicago Zone 01-Canal IL   9329 AMERITECH ILLINOIS 358      
312-234 5 Chicago Zone 01-Canal IL   9329 AMERITECH ILLINOIS 358      
312-234 6 Chicago Zone 01-Canal IL   9329 AMERITECH ILLINOIS 358      
312-234 7 Chicago Zone 01-Canal IL   9329 AMERITECH ILLINOIS 358      

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Last updated: Tue, 31 Dec 2019 02:37:20 UTC

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