Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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Switch: CHCGILWUX6X

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
312-447 3 Chicago Zone 01-Wabash IL 460K FIRST COMMUNICATIONS, LLC 358   2006-07-11   
312-447 5 Chicago Zone 01-Wabash IL 460K FIRST COMMUNICATIONS, LLC 358   2006-07-11   
312-447 6 Chicago Zone 01-Wabash IL 460K FIRST COMMUNICATIONS, LLC 358   2006-07-11   
312-447 7 Chicago Zone 01-Wabash IL 460K FIRST COMMUNICATIONS, LLC 358   2006-07-11   
312-447 8 Chicago Zone 01-Wabash IL 460K FIRST COMMUNICATIONS, LLC 358   2008-04-03   
312-448 5 Chicago Zone 01-Calumet IL 460K FIRST COMMUNICATIONS, LLC 358   2012-06-07   
312-469 3 Chicago Zone 01-Superior IL 460K FIRST COMMUNICATIONS, LLC 358   2017-01-02   
312-476 8 Chicago Zone 01-Calumet IL 460K FIRST COMMUNICATIONS, LLC 358   2009-09-16   
312-487 5 Chicago Zone 01-Calumet IL 460K FIRST COMMUNICATIONS, LLC 358   2014-12-19   
312-506 A Chicago Zone 01-Calumet IL 460K FIRST COMMUNICATIONS, LLC 358      
312-506 0 Chicago Zone 01-Calumet IL 460K FIRST COMMUNICATIONS, LLC 358   2004-07-15   
312-506 1 Chicago Zone 01-Calumet IL 460K FIRST COMMUNICATIONS, LLC 358   2004-07-15   
312-506 2 Chicago Zone 01-Calumet IL 460K FIRST COMMUNICATIONS, LLC 358   2004-07-15   
312-506 3 Chicago Zone 01-Calumet IL 460K FIRST COMMUNICATIONS, LLC 358   2004-07-15   
312-506 4 Chicago Zone 01-Calumet IL 460K FIRST COMMUNICATIONS, LLC 358   2008-04-03   
312-506 6 Chicago Zone 01-Calumet IL 460K FIRST COMMUNICATIONS, LLC 358   2004-07-15   
312-506 9 Chicago Zone 01-Calumet IL 460K FIRST COMMUNICATIONS, LLC 358   2004-07-15   
312-521 7 Chicago Zone 01-Calumet IL 460K FIRST COMMUNICATIONS, LLC 358   2003-10-22   
312-529 4 Chicago Zone 01-Franklin IL 460K FIRST COMMUNICATIONS, LLC 358   2005-05-25   
312-529 5 Chicago Zone 01-Franklin IL 460K FIRST COMMUNICATIONS, LLC 358   2005-03-31   
312-546 5 Chicago Zone 01-Wabash IL 460K FIRST COMMUNICATIONS, LLC 358   2004-11-06   
312-561 2 Chicago Zone 01-Calumet IL 460K FIRST COMMUNICATIONS, LLC 358   2014-01-21   
312-561 5 Chicago Zone 01-Calumet IL 460K FIRST COMMUNICATIONS, LLC 358   2013-05-11   
312-564 A Chicago Zone 01-Calumet IL 460K FIRST COMMUNICATIONS, LLC 358      
312-564 0 Chicago Zone 01-Calumet IL 460K FIRST COMMUNICATIONS, LLC 358   2007-01-04   
312-564 1 Chicago Zone 01-Calumet IL 460K FIRST COMMUNICATIONS, LLC 358   2007-01-04   
312-564 2 Chicago Zone 01-Calumet IL 460K FIRST COMMUNICATIONS, LLC 358   2007-01-04   
312-564 3 Chicago Zone 01-Calumet IL 460K FIRST COMMUNICATIONS, LLC 358   2007-01-04   
312-564 6 Chicago Zone 01-Calumet IL 460K FIRST COMMUNICATIONS, LLC 358   2007-01-04   
312-564 9 Chicago Zone 01-Calumet IL 460K FIRST COMMUNICATIONS, LLC 358   2007-01-04   
312-568 2 Chicago Zone 01-Canal IL 460K FIRST COMMUNICATIONS, LLC 358   2005-11-17   
312-568 3 Chicago Zone 01-Canal IL 460K FIRST COMMUNICATIONS, LLC 358   2005-11-17   
312-568 4 Chicago Zone 01-Canal IL 460K FIRST COMMUNICATIONS, LLC 358   2006-04-27   
312-568 5 Chicago Zone 01-Canal IL 460K FIRST COMMUNICATIONS, LLC 358   2005-10-02   
312-582 1 Chicago Zone 01-Wabash IL 460K FIRST COMMUNICATIONS, LLC 358   2009-03-03   
312-589 5 Chicago Zone 01-Canal IL 460K FIRST COMMUNICATIONS, LLC 358   2006-03-27   
312-605 9 Chicago Zone 01-Calumet IL 460K FIRST COMMUNICATIONS, LLC 358   2012-11-01   
312-626 1 Chicago Zone 01-Calumet IL 460K FIRST COMMUNICATIONS, LLC 358   2013-07-21   
312-635 3 Chicago Zone 01-Calumet IL 460K FIRST COMMUNICATIONS, LLC 358   2014-06-15   
312-648 6 Chicago Zone 01-Canal IL 460K FIRST COMMUNICATIONS, LLC 358   2011-06-20   
312-651 5 Chicago Zone 01-Canal IL 460K FIRST COMMUNICATIONS, LLC 358   2006-06-22   
312-662 4 Chicago Zone 01-Wabash IL 460K FIRST COMMUNICATIONS, LLC 358   2007-07-23   
312-662 5 Chicago Zone 01-Wabash IL 460K FIRST COMMUNICATIONS, LLC 358   2007-07-23   
312-662 6 Chicago Zone 01-Wabash IL 460K FIRST COMMUNICATIONS, LLC 358   2007-07-23   
312-662 7 Chicago Zone 01-Wabash IL 460K FIRST COMMUNICATIONS, LLC 358   2007-07-23   
312-673 A Chicago Zone 01-Calumet IL 460K FIRST COMMUNICATIONS, LLC 358      
312-676 A Chicago Zone 01-Calumet IL 460K FIRST COMMUNICATIONS, LLC 358      
312-676 0 Chicago Zone 01-Calumet IL 460K FIRST COMMUNICATIONS, LLC 358   2006-08-07   
312-676 1 Chicago Zone 01-Calumet IL 460K FIRST COMMUNICATIONS, LLC 358   2006-08-07   
312-676 2 Chicago Zone 01-Calumet IL 460K FIRST COMMUNICATIONS, LLC 358   2006-08-07   

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Last updated: Thu, 05 Feb 2026 23:41:55 UTC

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