Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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Chicago Zone 02-Irving, IL

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NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
773-681 8 CHCGILWUX6X  460K FIRST COMMUNICATIONS, LLC 358   2000-08-04   
773-681 9 BNSVILDGDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358      
773-730 A CHCGILIRDS0  9329 ILLINOIS BELL TEL CO 358      
773-866 A CHCGILIRDS0  9329 ILLINOIS BELL TEL CO 358      
773-866 0 CHCGILIRDS0  9329 ILLINOIS BELL TEL CO 358      
773-866 1 CHCGILIRDS0  9329 ILLINOIS BELL TEL CO 358      
773-866 2 CHCGILIRDS0  9329 ILLINOIS BELL TEL CO 358      
773-866 3 CHCGILIRDS0  9329 ILLINOIS BELL TEL CO 358      
773-866 4 CHCGILIRDS0  9329 ILLINOIS BELL TEL CO 358      
773-866 5 CHCGILIRDS0  9329 ILLINOIS BELL TEL CO 358      
773-866 6 CHCGILIRDS0  9329 ILLINOIS BELL TEL CO 358      
773-866 7 CHCGILIRDS0  9329 ILLINOIS BELL TEL CO 358      
773-866 8 CHCGILIRDS0  9329 ILLINOIS BELL TEL CO 358      
773-866 9 CHCGILIDXDX  624H ONVOY SPECTRUM, LLC 358   2024-10-14   
773-961 A CHCGILIRDS0  9329 ILLINOIS BELL TEL CO 358      
773-961 0 CHCGILIRDS0  9329 ILLINOIS BELL TEL CO 358      
773-961 1 CHCGILIRDS0  9329 ILLINOIS BELL TEL CO 358      
773-961 2 CHCGILIRDS0  9329 ILLINOIS BELL TEL CO 358      
773-961 3 CHCGILIRDS0  9329 ILLINOIS BELL TEL CO 358      
773-961 4 ELGNILOTGT5  6529 T-MOBILE USA, INC. 358   2008-06-13   
773-961 5 ELGNILOTGT5  6529 T-MOBILE USA, INC. 358   2008-06-13   
773-961 6 ELGNILOTGT5  6529 T-MOBILE USA, INC. 358   2008-06-13   
773-961 7 CHCGILNEXJX  318J COMCAST IP PHONE, LLC 358   2008-07-10   
773-961 8 CHCGILNEXJX  318J COMCAST IP PHONE, LLC 358   2008-07-10   
773-961 9 ELGNILOTGT5  6529 T-MOBILE USA, INC. 358   2010-08-30   

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Last updated: Tue, 01 Sep 2026 00:40:05 UTC

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