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
312-229 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   

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

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