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
312-219 4   984E BANDWIDTH.COM CLEC, LLC - IL 358   2012-06-24   
312-219 5   984E BANDWIDTH.COM CLEC, LLC - IL 358   2012-06-24   
312-219 6   829J PAETEC ITEL, LLC 358   2012-06-21   
312-219 7   7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358   2012-08-01   
312-219 8   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2012-08-03   
312-219 9   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2012-08-03   
312-221 A ELGNILOTGT5  6529 T-MOBILE USA, INC. 358      
312-221 0   6529 T-MOBILE USA, INC. 358   2011-08-08   
312-221 1   6529 T-MOBILE USA, INC. 358   2011-08-08   
312-221 2   6529 T-MOBILE USA, INC. 358   2011-08-08   
312-221 3   5562 METROPCS, INC. 358   2011-08-08   
312-221 4   6529 T-MOBILE USA, INC. 358   2011-08-08   
312-221 5   6529 T-MOBILE USA, INC. 358   2011-08-08   
312-221 6   6529 T-MOBILE USA, INC. 358   2011-08-08   
312-221 7   6529 T-MOBILE USA, INC. 358   2011-08-08   
312-221 8   6529 T-MOBILE USA, INC. 358   2011-08-09   
312-221 9   6529 T-MOBILE USA, INC. 358   2011-08-08   
312-224 A CHCGILGMDS7  6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-225 A CHCGILCADS1  9329 ILLINOIS BELL TEL CO 358      
312-227 A CHCGILSUDS2  9329 ILLINOIS BELL TEL CO 358      
312-227 0   9329 ILLINOIS BELL TEL CO 358   2010-10-15   
312-227 1   9329 ILLINOIS BELL TEL CO 358   2010-10-15   
312-227 2   9329 ILLINOIS BELL TEL CO 358   2010-10-15   
312-227 3   9329 ILLINOIS BELL TEL CO 358   2010-10-15   
312-227 4   9329 ILLINOIS BELL TEL CO 358   2010-10-15   
312-227 5   9329 ILLINOIS BELL TEL CO 358   2010-10-15   
312-227 6   9329 ILLINOIS BELL TEL CO 358   2010-10-15   
312-227 7   9329 ILLINOIS BELL TEL CO 358   2010-10-15   
312-227 8   9329 ILLINOIS BELL TEL CO 358   2010-10-15   
312-227 9   9329 ILLINOIS BELL TEL CO 358   2010-10-15   
312-238 A CHCGILGMDS7  6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-238 0   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-238 1   7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358      
312-238 2   7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358      
312-238 3   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-238 4   7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358      
312-238 5   7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358      
312-238 6   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-238 7   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-238 8   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-238 9   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-241 A BURGILAHGT3  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358      
312-241 0   6529 T-MOBILE USA, INC. 358   2011-10-17   
312-241 1   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2011-10-24   
312-241 2   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2011-10-14   
312-241 3   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2011-10-14   
312-241 4   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2011-10-14   
312-241 5   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2011-10-14   
312-241 6   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2011-10-14   
312-241 7   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2011-10-14   

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

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