Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

Switch: CHCGILWBDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
312-353 A Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-362 A Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-385 A Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-408 A Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-427 A Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-435 A Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-554 A Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-582 A Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-692 A Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-697 A Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-732 A Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-789 A Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-823 A Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-886 A Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-939 A Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-983 A Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      

Last updated: Tue, 31 Dec 2019 02:37:20 UTC

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