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: CHCGILCLDS3

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
312-207 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-234 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-308 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-380 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-382 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-430 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-436 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-454 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-466 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-496 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-526 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-537 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-544 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-559 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-568 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-575 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-589 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-612 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-614 A Chicago Zone 01-Calumet IL 9329 AMERITECH ILLINOIS 358   2012-11-18   
312-648 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-651 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-655 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-669 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-672 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-681 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-707 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-714 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-716 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-775 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-798 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-831 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-869 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-875 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-902 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-906 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-930 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
312-954 A Chicago Zone 01-Canal IL 9329 AMERITECH ILLINOIS 358      
872-825 A Chicago Zone 01-Calumet IL 9329 AMERITECH ILLINOIS 358   2010-01-17   

Last updated: Sun, 10 Nov 2019 13:49:34 UTC

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