Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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Chicago Zone 01-Lakeshore, IL

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
312-228 A CHCGILLRDS0  9329 ILLINOIS BELL TEL CO 358      
312-233 A CHCGILLRDS0  9329 ILLINOIS BELL TEL CO 358      
312-233 0 CHCGILLRDS0  9329 ILLINOIS BELL TEL CO 358      
312-233 1 CHCGILLRDS0  9329 ILLINOIS BELL TEL CO 358      
312-233 2 CHCGILGMDS7  6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2005-12-08   
312-233 3 CHCGILLRDS0  9329 ILLINOIS BELL TEL CO 358      
312-233 4 CHCGILLRDS0  9329 ILLINOIS BELL TEL CO 358      
312-233 5 CHCGILLRDS0  9329 ILLINOIS BELL TEL CO 358      
312-233 6 CHCGILLRDS0  9329 ILLINOIS BELL TEL CO 358      
312-233 7 CHCGILLRDS0  9329 ILLINOIS BELL TEL CO 358      
312-233 8 CHCGILLRDS0  9329 ILLINOIS BELL TEL CO 358      
312-233 9 CHCGILLRDS0  9329 ILLINOIS BELL TEL CO 358      
312-240 A CHCGILLRDS0  9329 ILLINOIS BELL TEL CO 358      
312-297 A CHCGILLRDS0  9329 ILLINOIS BELL TEL CO 358      
312-374 A CHCGILLRDS0  9329 ILLINOIS BELL TEL CO 358      
312-374 0 CHCGILLRDS0  9329 ILLINOIS BELL TEL CO 358      
312-374 1 CHCGILNEXJX  318J COMCAST IP PHONE, LLC 358   2012-12-31   
312-374 2 CHCGILWUX6X  460K FIRST COMMUNICATIONS, LLC 358   2013-01-04   
312-374 3 CHCGILNEXJX  318J COMCAST IP PHONE, LLC 358   2012-12-31   
312-374 4 CHCGILNEXJX  318J COMCAST IP PHONE, LLC 358   2014-01-11   
312-374 5 CHCGILDTKMD  5447 ACCESS ONE, INC. - IL 358   2014-01-12   
312-374 6 CHCGIL24DS6  224C ONVOY, LLC 358   2013-12-23   
312-374 7 CHCGILLRDS0  9329 ILLINOIS BELL TEL CO 358      
312-374 8 CHCGILNEXJX  318J COMCAST IP PHONE, LLC 358   2015-01-08   
312-374 9 CHCGILLRDS0  9329 ILLINOIS BELL TEL CO 358      
312-472 A CHCGILLRDS0  9329 ILLINOIS BELL TEL CO 358      
312-472 0 CHCGILLRDS0  9329 ILLINOIS BELL TEL CO 358   2005-12-18   
312-472 1 CHCGILLRDS0  9329 ILLINOIS BELL TEL CO 358   2005-12-18   
312-472 2 CHCGILLRDS0  9329 ILLINOIS BELL TEL CO 358   2005-12-18   
312-472 3 CHCGILLRDS0  9329 ILLINOIS BELL TEL CO 358   2005-12-18   
312-472 4 CHCGILLRDS0  9329 ILLINOIS BELL TEL CO 358   2005-12-18   
312-472 5 CHCGILLRDS0  9329 ILLINOIS BELL TEL CO 358   2005-12-18   
312-472 6 CHCGILLRDS0  9329 ILLINOIS BELL TEL CO 358   2005-12-18   
312-472 7 CHCGILLRDS0  9329 ILLINOIS BELL TEL CO 358   2005-12-18   
312-472 8 CHCGILLRDS0  9329 ILLINOIS BELL TEL CO 358   2005-12-18   
312-472 9 CHCGILLRDS0  9329 ILLINOIS BELL TEL CO 358   2005-12-18   
312-540 A CHCGILLRDS0  9329 ILLINOIS BELL TEL CO 358      
312-552 A CHCGILLRDS0  9329 ILLINOIS BELL TEL CO 358      
312-565 A CHCGILLRDS0  9329 ILLINOIS BELL TEL CO 358      
312-616 A CHCGILLRDS0  9329 ILLINOIS BELL TEL CO 358      
312-650 A CHCGILACGT0  8702 RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 358      
312-650 0 CHCGILACGT0  8702 RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 358      
312-650 1 CHCGILACGT0  8702 RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 358      
312-650 2 CHCGILACGT0  8702 RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 358      
312-650 3 CHCGILACGT0  8702 RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 358      
312-650 4 CHCGILACGT0  8702 RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 358      
312-650 5 CHCGILACGT0  8702 RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 358      
312-650 6 CHCGILACGT0  8702 RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 358      
312-650 7 BNSVILDGDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358   2004-11-27   
312-650 8 BNSVILDGDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358   2004-11-27   
312-650 9 CHCGILWBXDZ  984E BANDWIDTH.COM CLEC, LLC - IL 358   2010-03-04   
312-653 A CHCGILLRDS0  9329 ILLINOIS BELL TEL CO 358      
312-729 A CHCGILLRDS0  9329 ILLINOIS BELL TEL CO 358      
312-819 A CHCGILLRDS0  9329 ILLINOIS BELL TEL CO 358      
312-856 A CHCGILLRDS0  9329 ILLINOIS BELL TEL CO 358      
312-856 0 CHCGILLRDS0  9329 ILLINOIS BELL TEL CO 358      
312-856 1 CHCGILLRDS0  9329 ILLINOIS BELL TEL CO 358      
312-856 2 BURGILAHGT3  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2015-01-03   
312-856 3 BURGILAHGT3  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2015-01-03   
312-856 4 BURGILAHGT3  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2015-01-03   
312-856 5 BURGILAHGT3  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2015-01-03   
312-856 6 BURGILAHGT3  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2015-01-03   
312-856 7 BURGILAHGT3  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2015-01-03   
312-856 8 CHCGILLRDS0  9329 ILLINOIS BELL TEL CO 358      
312-856 9 CHCGILLRDS0  9329 ILLINOIS BELL TEL CO 358      
312-861 A CHCGILLRDS0  9329 ILLINOIS BELL TEL CO 358      
312-938 A CHCGILLRDS0  9329 ILLINOIS BELL TEL CO 358      
312-946 A CHCGILLRDS0  9329 ILLINOIS BELL TEL CO 358      

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

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