Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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Switch: CHCGILCGDS1

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
312-995 6 Chicago Zone 01-Calumet IL 7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358   2014-10-13   
312-995 7 Chicago Zone 01-Calumet IL 7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358   2014-10-13   
312-995 8 Chicago Zone 01-Calumet IL 7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358   2014-10-13   
630-422 6 Bensenville IL 7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358   2012-08-27   
630-644 5 Bensenville IL 7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358   2013-12-16   
773-824 A Chicago Zone 03-Kildare IL 7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358      
773-824 2 Chicago Zone 03-Kildare IL 7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358      
773-824 3 Chicago Zone 03-Kildare IL 7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358      
773-824 4 Chicago Zone 03-Kildare IL 7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358      
847-789 5 Des Plaines IL 7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358   2003-10-22   

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

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