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
312-940 8   063E PEERLESS NETWORK OF ILLINOIS, LLC - IL 358   2013-11-11   
312-940 9   063E PEERLESS NETWORK OF ILLINOIS, LLC - IL 358   2013-11-11   
312-947 A CHCGILMODS1  9329 ILLINOIS BELL TEL CO 358      
312-947 0   9329 ILLINOIS BELL TEL CO 358   2010-12-18   
312-947 1   9329 ILLINOIS BELL TEL CO 358   2010-12-18   
312-947 2   9329 ILLINOIS BELL TEL CO 358   2010-12-18   
312-947 3   9329 ILLINOIS BELL TEL CO 358   2010-12-18   
312-947 4   9329 ILLINOIS BELL TEL CO 358   2010-12-18   
312-947 5   9329 ILLINOIS BELL TEL CO 358   2010-12-18   
312-947 6   9329 ILLINOIS BELL TEL CO 358   2010-12-18   
312-947 7   9329 ILLINOIS BELL TEL CO 358   2010-12-18   
312-947 8   9329 ILLINOIS BELL TEL CO 358   2010-12-18   
312-947 9   9329 ILLINOIS BELL TEL CO 358   2010-12-18   
312-948 A CHCGILWBXWZ  829J PAETEC ITEL, LLC 358   2024-12-09   
312-948 0   829J PAETEC ITEL, LLC 358      
312-948 1   9329 ILLINOIS BELL TEL CO 358   2002-06-03   
312-948 2   9329 ILLINOIS BELL TEL CO 358   2002-06-03   
312-948 3   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2002-06-02   
312-948 4   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2002-06-03   
312-948 5   829J PAETEC ITEL, LLC 358      
312-948 6   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2002-06-03   
312-948 7   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2002-06-03   
312-948 8   829J PAETEC ITEL, LLC 358   2001-01-18   
312-948 9   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2011-08-06   
312-949 A CHCGILCADS1  9329 ILLINOIS BELL TEL CO 358      
312-956 A BURGILAHGT3  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358      
312-956 0   5562 METROPCS, INC. 358   2014-11-15   
312-956 1   5562 METROPCS, INC. 358   2014-11-15   
312-956 2   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2014-10-29   
312-956 3   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2014-10-29   
312-956 4   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2014-10-29   
312-956 5   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2014-10-29   
312-956 6   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2014-10-29   
312-956 7   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2014-10-29   
312-956 8   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2014-10-29   
312-956 9   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2014-10-29   
312-962 A   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-962 0   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-962 1   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-962 2   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-962 3   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-962 4   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-962 5   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-962 6   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-962 7   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-962 8   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
312-962 9   5562 METROPCS, INC. 358   2014-07-21   
312-964 A CHCGIL24DS6  224C ONVOY, LLC 358      
312-964 0   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2016-01-17   
312-964 1   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2016-01-17   

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

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