Local Calling Guide

Area code/prefix search

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

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NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
312-617 6   6529 T-MOBILE USA, INC. 358      
312-617 7   6529 T-MOBILE USA, INC. 358      
312-617 8   6529 T-MOBILE USA, INC. 358      
312-617 9   6529 T-MOBILE USA, INC. 358      
312-619 A ELGNILOTGT5  6529 T-MOBILE USA, INC. 358      
312-619 0   6529 T-MOBILE USA, INC. 358   2012-10-26   
312-619 1   6529 T-MOBILE USA, INC. 358   2012-10-26   
312-619 2   6529 T-MOBILE USA, INC. 358   2012-10-26   
312-619 3   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358   2012-10-29   
312-619 4   7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358   2012-11-04   
312-619 5   7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358   2012-11-04   
312-619 6   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2012-11-18   
312-619 7   6529 T-MOBILE USA, INC. 358   2012-11-28   
312-619 8   6529 T-MOBILE USA, INC. 358   2012-11-28   
312-619 9   6529 T-MOBILE USA, INC. 358   2012-10-26   
312-620 A CHCGILWBXDZ  984E BANDWIDTH.COM CLEC, LLC - IL 358      
312-620 0   984E BANDWIDTH.COM CLEC, LLC - IL 358   2012-10-13   
312-620 1   984E BANDWIDTH.COM CLEC, LLC - IL 358   2012-10-13   
312-620 2   984E BANDWIDTH.COM CLEC, LLC - IL 358   2012-10-13   
312-620 3   984E BANDWIDTH.COM CLEC, LLC - IL 358   2012-10-13   
312-620 4   984E BANDWIDTH.COM CLEC, LLC - IL 358   2012-10-13   
312-620 5   984E BANDWIDTH.COM CLEC, LLC - IL 358   2012-10-13   
312-620 6   984E BANDWIDTH.COM CLEC, LLC - IL 358   2012-10-13   
312-620 7   984E BANDWIDTH.COM CLEC, LLC - IL 358   2012-10-13   
312-620 8   984E BANDWIDTH.COM CLEC, LLC - IL 358   2012-10-13   
312-620 9   984E BANDWIDTH.COM CLEC, LLC - IL 358   2012-10-13   
312-625 A CHCGILGMDS7  6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-625 0   984E BANDWIDTH.COM CLEC, LLC - IL 358   2014-02-06   
312-625 1   984E BANDWIDTH.COM CLEC, LLC - IL 358   2014-02-06   
312-625 2   984E BANDWIDTH.COM CLEC, LLC - IL 358   2014-02-06   
312-625 3   984E BANDWIDTH.COM CLEC, LLC - IL 358   2014-02-06   
312-625 4   138G LEVEL 3 TELECOM OF ILLINOIS, LLC - IL 358   2014-02-24   
312-625 5   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2014-01-26   
312-625 6   984E BANDWIDTH.COM CLEC, LLC - IL 358   2014-02-06   
312-625 7   984E BANDWIDTH.COM CLEC, LLC - IL 358   2014-02-06   
312-625 8   984E BANDWIDTH.COM CLEC, LLC - IL 358   2014-02-06   
312-625 9   984E BANDWIDTH.COM CLEC, LLC - IL 358   2014-02-06   
312-626 A CHCGIL24DS6  224C ONVOY, LLC 358      
312-626 0   224C ONVOY, LLC 358   2013-08-15   
312-626 1   460K FIRST COMMUNICATIONS, LLC 358   2013-07-21   
312-626 2   224C ONVOY, LLC 358   2008-03-31   
312-626 3   224C ONVOY, LLC 358   2013-08-15   
312-626 4   224C ONVOY, LLC 358   2013-08-15   
312-626 5   224C ONVOY, LLC 358   2013-08-15   
312-626 6   224C ONVOY, LLC 358   2013-08-15   
312-626 7   224C ONVOY, LLC 358   2013-08-15   
312-626 8   224C ONVOY, LLC 358   2013-08-15   
312-626 9   224C ONVOY, LLC 358   2013-08-15   
312-628 A BNSVILDGDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358      
312-628 0   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358      

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Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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