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: CHCGILSUDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
312-335 A Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-417 A Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-440 A Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-469 2 Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-534 A Chicago Zone 01-Calumet IL 9329 AMERITECH ILLINOIS 358      
312-534 0 Chicago Zone 01-Calumet IL 9329 AMERITECH ILLINOIS 358   2008-11-01   
312-534 1 Chicago Zone 01-Calumet IL 9329 AMERITECH ILLINOIS 358   2008-11-01   
312-534 2 Chicago Zone 01-Calumet IL 9329 AMERITECH ILLINOIS 358   2008-11-01   
312-534 3 Chicago Zone 01-Calumet IL 9329 AMERITECH ILLINOIS 358   2008-11-01   
312-534 4 Chicago Zone 01-Calumet IL 9329 AMERITECH ILLINOIS 358   2008-11-01   
312-534 5 Chicago Zone 01-Calumet IL 9329 AMERITECH ILLINOIS 358   2008-11-01   
312-534 6 Chicago Zone 01-Calumet IL 9329 AMERITECH ILLINOIS 358   2008-11-01   
312-534 7 Chicago Zone 01-Calumet IL 9329 AMERITECH ILLINOIS 358   2008-11-01   
312-534 8 Chicago Zone 01-Calumet IL 9329 AMERITECH ILLINOIS 358   2008-11-01   
312-534 9 Chicago Zone 01-Calumet IL 9329 AMERITECH ILLINOIS 358   2008-11-01   
312-587 A Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-654 A Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-751 A Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-790 A Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-867 A Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-932 A Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-932 0 Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-932 1 Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-932 2 Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-932 3 Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-932 4 Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-932 8 Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-932 9 Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      
312-979 A Chicago Zone 01-Superior IL 9329 AMERITECH ILLINOIS 358      

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

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.