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: CHCGILCLDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
312-258 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-441 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-463 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-474 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-627 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-632 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-715 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-756 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-876 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-879 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-887 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-912 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-928 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-993 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      

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

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