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

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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      
312-385 1 Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-385 2 Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-385 3 Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-385 4 Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-385 5 Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-385 6 Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-385 7 Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-385 8 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      
312-554 0 Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-554 1 Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-554 2 Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-554 3 Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-554 4 Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-554 7 Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-554 8 Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-582 A Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-582 3 Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358   2002-06-15   
312-582 5 Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358   2002-06-15   
312-582 6 Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358   2002-06-15   
312-582 7 Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358   2002-06-15   
312-582 8 Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358   2002-06-15   
312-582 9 Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358   2002-06-15   
312-692 A Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-692 0 Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-692 2 Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-692 3 Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-692 4 Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-692 5 Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-692 6 Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-692 7 Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-692 8 Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-697 A Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-697 0 Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-697 2 Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-697 3 Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-697 4 Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-697 5 Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-697 6 Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-697 7 Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      
312-697 8 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      
312-789 0 Chicago Zone 01-Wabash IL 9329 AMERITECH ILLINOIS 358      

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

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