Local Calling Guide

Area code/prefix search

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Chicago Zone 01-Superior, IL

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NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
312-799 7 CHCGILGMDS7  6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2000-08-29   
312-799 8 CHCGILSUDS2  9329 ILLINOIS BELL TEL CO 358   2000-11-18   
312-799 9 ELGNILOTGT5  6529 T-MOBILE USA, INC. 358   2005-01-04   
312-821 A EGVGILIFDS1  7196 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 358      
312-821 0 BNSVILDGDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358      
312-821 1 BNSVILDGDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358      
312-821 2 BNSVILDGDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358      
312-821 3 BNSVILDGDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358      
312-821 4 BNSVILDGDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358      
312-821 5 BNSVILDGDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358      
312-821 6 BNSVILDGDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358      
312-821 7 BNSVILDGDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358      
312-821 8 BNSVILDGDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358      
312-821 9 EGVGILIFDS1  7196 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 358      
312-867 A CHCGILSUDS0  9329 ILLINOIS BELL TEL CO 358      
312-908 A CHCGILSUDS2  9329 ILLINOIS BELL TEL CO 358      
312-915 A CHCGILSUDS2  9329 ILLINOIS BELL TEL CO 358      
312-926 A CHCGILSUDS2  9329 ILLINOIS BELL TEL CO 358      
312-932 A CHCGILSUDS0  9329 ILLINOIS BELL TEL CO 358      
312-932 0 CHCGILSUDS0  9329 ILLINOIS BELL TEL CO 358      
312-932 1 CHCGILSUDS0  9329 ILLINOIS BELL TEL CO 358      
312-932 2 CHCGILSUDS0  9329 ILLINOIS BELL TEL CO 358      
312-932 3 CHCGILSUDS0  9329 ILLINOIS BELL TEL CO 358      
312-932 4 CHCGILSUDS0  9329 ILLINOIS BELL TEL CO 358      
312-932 5 CHCGILGMDS7  6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2001-12-06   
312-932 6 CHCGILGMDS7  6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2000-07-07   
312-932 7 CHCGILIDXDX  624H ONVOY SPECTRUM, LLC 358   2022-04-09   
312-932 8 CHCGILSUDS0  9329 ILLINOIS BELL TEL CO 358      
312-932 9 CHCGILSUDS0  9329 ILLINOIS BELL TEL CO 358      
312-943 A CHCGILSUDS2  9329 ILLINOIS BELL TEL CO 358      
312-944 A CHCGILSUDS2  9329 ILLINOIS BELL TEL CO 358      
312-951 A CHCGILSUDS2  9329 ILLINOIS BELL TEL CO 358      
312-951 0 CHCGILSUDS2  9329 ILLINOIS BELL TEL CO 358      
312-951 1 CHCGILSUDS2  9329 ILLINOIS BELL TEL CO 358      
312-951 2 CHCGILSUDS2  9329 ILLINOIS BELL TEL CO 358      
312-951 3 BURGILAHGT3  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2015-01-03   
312-951 4 CHCGILSUDS2  9329 ILLINOIS BELL TEL CO 358      
312-951 5 CHCGILSUDS2  9329 ILLINOIS BELL TEL CO 358      
312-951 6 CHCGILSUDS2  9329 ILLINOIS BELL TEL CO 358      
312-951 7 CHCGILSUDS2  9329 ILLINOIS BELL TEL CO 358      
312-951 8 CHCGILSUDS2  9329 ILLINOIS BELL TEL CO 358      
312-951 9 CHCGILSUDS2  9329 ILLINOIS BELL TEL CO 358      
312-979 A CHCGILSUDS0  9329 ILLINOIS BELL TEL CO 358      
312-988 A CHCGILSUDS2  9329 ILLINOIS BELL TEL CO 358      
312-988 0 CHCGILNEXJX  318J COMCAST IP PHONE, LLC 358   2012-12-31   
312-988 1 CHCGILSUDS2  9329 ILLINOIS BELL TEL CO 358      
312-988 2 CHCGILSUDS2  9329 ILLINOIS BELL TEL CO 358      
312-988 3 CHCGILSUDS2  9329 ILLINOIS BELL TEL CO 358      
312-988 4 CHCGILSUDS2  9329 ILLINOIS BELL TEL CO 358      
312-988 5 CHCGILSUDS2  9329 ILLINOIS BELL TEL CO 358      
312-988 6 CHCGILSUDS2  9329 ILLINOIS BELL TEL CO 358      
312-988 7 CHCGILSUDS2  9329 ILLINOIS BELL TEL CO 358      
312-988 8 CHCGILSUDS2  9329 ILLINOIS BELL TEL CO 358      
312-988 9 CHCGILSUDS2  9329 ILLINOIS BELL TEL CO 358      

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Last updated: Sun, 17 May 2026 03:26:51 UTC

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