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
312-667 2   063E PEERLESS NETWORK OF ILLINOIS, LLC - IL 358   2012-10-22   
312-667 3   063E PEERLESS NETWORK OF ILLINOIS, LLC - IL 358   2012-10-22   
312-667 4   063E PEERLESS NETWORK OF ILLINOIS, LLC - IL 358   2012-10-22   
312-667 5   063E PEERLESS NETWORK OF ILLINOIS, LLC - IL 358   2012-10-22   
312-667 6   063E PEERLESS NETWORK OF ILLINOIS, LLC - IL 358   2012-10-22   
312-667 7   063E PEERLESS NETWORK OF ILLINOIS, LLC - IL 358   2012-10-22   
312-667 8   063E PEERLESS NETWORK OF ILLINOIS, LLC - IL 358   2012-10-22   
312-667 9   063E PEERLESS NETWORK OF ILLINOIS, LLC - IL 358   2012-10-22   
312-668 A CHCGIL24X0X  425J CSC WIRELESS, LLC 358      
312-668 0   984E BANDWIDTH.COM CLEC, LLC - IL 358   2019-10-04   
312-668 1   138G LEVEL 3 TELECOM OF ILLINOIS, LLC - IL 358   2019-09-16   
312-668 2   425J CSC WIRELESS, LLC 358   2019-07-19   
312-668 3   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358   2019-09-14   
312-668 4   829J PAETEC ITEL, LLC 358   2019-07-20   
312-668 5   829J PAETEC ITEL, LLC 358   2019-07-20   
312-668 6   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2019-08-18   
312-668 7   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2019-08-18   
312-668 8   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2019-08-18   
312-668 9   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2019-08-18   
312-671 A ELGNILOTGT5  5562 METROPCS, INC. 358      
312-671 0   6529 T-MOBILE USA, INC. 358      
312-671 1   6529 T-MOBILE USA, INC. 358      
312-671 2   6529 T-MOBILE USA, INC. 358      
312-671 3   5562 METROPCS, INC. 358      
312-671 4   5562 METROPCS, INC. 358      
312-671 5   5562 METROPCS, INC. 358      
312-671 6   5562 METROPCS, INC. 358      
312-671 7   5562 METROPCS, INC. 358      
312-671 8   5562 METROPCS, INC. 358      
312-671 9   5562 METROPCS, INC. 358      
312-673 A CHCGILWUX6X  460K FIRST COMMUNICATIONS, LLC 358      
312-674 A CHCGILCADS0  9329 ILLINOIS BELL TEL CO 358      
312-674 0   9329 ILLINOIS BELL TEL CO 358      
312-674 1   624H ONVOY SPECTRUM, LLC 358   2022-01-07   
312-674 2   9329 ILLINOIS BELL TEL CO 358      
312-674 3   9329 ILLINOIS BELL TEL CO 358      
312-674 4   9329 ILLINOIS BELL TEL CO 358      
312-674 5   9329 ILLINOIS BELL TEL CO 358      
312-674 6   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2002-06-24   
312-674 7   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358   2011-01-05   
312-674 8   9329 ILLINOIS BELL TEL CO 358      
312-674 9   9329 ILLINOIS BELL TEL CO 358      
312-676 A CHCGILWUX6X  460K FIRST COMMUNICATIONS, LLC 358      
312-676 0   460K FIRST COMMUNICATIONS, LLC 358   2006-08-07   
312-676 1   460K FIRST COMMUNICATIONS, LLC 358   2006-08-07   
312-676 2   460K FIRST COMMUNICATIONS, LLC 358   2006-08-07   
312-676 3   460K FIRST COMMUNICATIONS, LLC 358   2006-08-07   
312-676 4   460K FIRST COMMUNICATIONS, LLC 358   2006-08-07   
312-676 5   460K FIRST COMMUNICATIONS, LLC 358   2006-08-07   
312-676 6   460K FIRST COMMUNICATIONS, LLC 358   2006-08-07   

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

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