Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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Chicago Zone 04-Humboldt, IL

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NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
312-735 A ELGNILOTGT5  6529 T-MOBILE USA, INC. 358      
312-735 0 ELGNILOTGT5  6529 T-MOBILE USA, INC. 358      
312-735 1 ELGNILOTGT5  6529 T-MOBILE USA, INC. 358      
312-735 2 ELGNILOTGT5  6529 T-MOBILE USA, INC. 358      
312-735 3 ELGNILOTGT5  6529 T-MOBILE USA, INC. 358      
312-735 4 ELGNILOTGT5  6529 T-MOBILE USA, INC. 358      
312-735 5 ELGNILOTGT5  6529 T-MOBILE USA, INC. 358      
312-735 6 ELGNILOTGT5  6529 T-MOBILE USA, INC. 358      
312-735 7 ELGNILOTGT5  6529 T-MOBILE USA, INC. 358      
312-735 8 ELGNILOTGT5  6529 T-MOBILE USA, INC. 358      
312-735 9 ELGNILOTGT5  6529 T-MOBILE USA, INC. 358      
773-227 A CHCGILHBDS1  9329 ILLINOIS BELL TEL CO 358      
773-235 A CHCGILHBDS1  9329 ILLINOIS BELL TEL CO 358      
773-246 A HMNDINPRCM0  6795 INDIANA PAGING NETWORK, INC. 358      
773-252 A CHCGILHBDS1  9329 ILLINOIS BELL TEL CO 358      
773-269 A OKBRILOAXEX  7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358      
773-269 0 ELGNILOTGT5  5562 METROPCS, INC. 358   2003-10-01   
773-269 1 ELGNILOTGT5  5562 METROPCS, INC. 358   2003-10-01   
773-269 2 CHCGILHBDS1  9329 ILLINOIS BELL TEL CO 358   2002-03-25   
773-269 3 CHCGIL24DS6  224C ONVOY, LLC 358   2014-09-03   
773-269 4 ELGNILOTGT5  5562 METROPCS, INC. 358   2007-05-20   
773-269 5 OKBRILOAXEX  7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358      
773-269 6 CHCGILWUX6X  460K FIRST COMMUNICATIONS, LLC 358   2005-07-04   
773-269 7 ELGNILOTGT5  5562 METROPCS, INC. 358   2003-10-01   
773-269 8 ELGNILOTGT5  5562 METROPCS, INC. 358   2003-10-01   
773-269 9 ELGNILOTGT5  5562 METROPCS, INC. 358   2003-05-06   
773-270 A ELGNILOTGT5  5562 METROPCS, INC. 358      
773-270 0 CHCGILWBXDZ  984E BANDWIDTH.COM CLEC, LLC - IL 358   2010-03-05   
773-270 1 CHCGILWBXDZ  984E BANDWIDTH.COM CLEC, LLC - IL 358   2010-03-05   
773-270 2 CHCGILWBXDZ  984E BANDWIDTH.COM CLEC, LLC - IL 358   2010-03-05   
773-270 3 CHCGILWBXDZ  984E BANDWIDTH.COM CLEC, LLC - IL 358   2010-03-05   
773-270 4 CHCGILNEXJX  318J COMCAST IP PHONE, LLC 358   2013-08-09   
773-270 5 CHCGILNEXJX  318J COMCAST IP PHONE, LLC 358   2013-08-09   
773-270 6 CHCGILNEXJX  318J COMCAST IP PHONE, LLC 358   2018-01-01   
773-270 7 ELGNILOTGT5  5562 METROPCS, INC. 358   2009-07-25   
773-270 8 CHCGILWBXDZ  984E BANDWIDTH.COM CLEC, LLC - IL 358   2010-11-27   
773-270 9 CHCGILGMDS7  6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2010-06-14   
773-276 A CHCGILHBDS1  9329 ILLINOIS BELL TEL CO 358      
773-278 A CHCGILHBDS1  9329 ILLINOIS BELL TEL CO 358      
773-289 A BNSVILDGDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358      
773-289 0 CHCGILGMDS7  6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2006-07-31   
773-289 1 BNSVILDGDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358      
773-289 2 ELGNILOTGT5  6529 T-MOBILE USA, INC. 358   2004-09-05   
773-289 3 CHCGILHBDS1  9329 ILLINOIS BELL TEL CO 358   2001-06-02   
773-289 4 CHCGILHBDS1  9329 ILLINOIS BELL TEL CO 358   2001-06-02   
773-289 5 BNSVILDGDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358      
773-289 6 ELGNILOTGT5  6529 T-MOBILE USA, INC. 358   2006-08-25   
773-289 7 ELGNILOTGT5  6529 T-MOBILE USA, INC. 358   2004-08-23   
773-289 8 ELGNILOTGT5  6529 T-MOBILE USA, INC. 358   2004-09-05   
773-289 9 BNSVILDGDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358      

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Last updated: Sat, 02 May 2026 12:20:53 UTC

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