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

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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      
312-463 0 Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-463 1 Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-463 2 Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-463 3 Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-463 5 Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-463 6 Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-463 7 Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-463 8 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      
312-627 0 Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-627 1 Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-627 2 Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-627 3 Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-627 4 Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-627 5 Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-627 6 Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-627 7 Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-627 8 Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-632 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-632 1 Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-632 2 Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-715 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-715 0 Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-715 1 Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-715 2 Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-715 3 Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-715 5 Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-715 6 Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-715 9 Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-756 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-756 1 Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-756 2 Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-756 3 Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-756 4 Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-756 5 Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-756 6 Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-768 2 Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358   2002-10-23   
312-876 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-879 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-879 0 Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-879 1 Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-879 2 Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-879 3 Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-879 4 Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-879 5 Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-879 6 Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      

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Last updated: Tue, 04 May 2021 15:04:27 UTC

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