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: CHCGILFRDS3

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
312-263 A Chicago Zone 01-Franklin IL 9329 AMERITECH ILLINOIS 358      
312-269 A Chicago Zone 01-Franklin IL 9329 AMERITECH ILLINOIS 358      
312-332 A Chicago Zone 01-Franklin IL 9329 AMERITECH ILLINOIS 358      
312-336 A Chicago Zone 01-Franklin IL 9329 AMERITECH ILLINOIS 358      
312-345 A Chicago Zone 01-Franklin IL 9329 AMERITECH ILLINOIS 358      
312-381 A Chicago Zone 01-Franklin IL 9329 AMERITECH ILLINOIS 358      
312-407 A Chicago Zone 01-Franklin IL 9329 AMERITECH ILLINOIS 358      
312-419 A Chicago Zone 01-Franklin IL 9329 AMERITECH ILLINOIS 358      
312-422 A Chicago Zone 01-Franklin IL 9329 AMERITECH ILLINOIS 358      
312-425 A Chicago Zone 01-Franklin IL 9329 AMERITECH ILLINOIS 358      
312-442 A Chicago Zone 01-Franklin IL 9329 AMERITECH ILLINOIS 358      
312-499 A Chicago Zone 01-Franklin IL 9329 AMERITECH ILLINOIS 358      
312-516 A Chicago Zone 01-Franklin IL 9329 AMERITECH ILLINOIS 358      
312-558 A Chicago Zone 01-Franklin IL 9329 AMERITECH ILLINOIS 358      
312-578 A Chicago Zone 01-Franklin IL 9329 AMERITECH ILLINOIS 358      
312-609 A Chicago Zone 01-Franklin IL 9329 AMERITECH ILLINOIS 358      
312-621 A Chicago Zone 01-Franklin IL 9329 AMERITECH ILLINOIS 358      
312-658 A Chicago Zone 01-Franklin IL 9329 AMERITECH ILLINOIS 358      
312-701 A Chicago Zone 01-Franklin IL 9329 AMERITECH ILLINOIS 358      
312-726 A Chicago Zone 01-Franklin IL 9329 AMERITECH ILLINOIS 358      
312-739 A Chicago Zone 01-Franklin IL 9329 AMERITECH ILLINOIS 358      
312-750 A Chicago Zone 01-Franklin IL 9329 AMERITECH ILLINOIS 358      
312-781 A Chicago Zone 01-Franklin IL 9329 AMERITECH ILLINOIS 358      
312-807 A Chicago Zone 01-Franklin IL 9329 AMERITECH ILLINOIS 358      
312-827 A Chicago Zone 01-Franklin IL 9329 AMERITECH ILLINOIS 358      
312-845 A Chicago Zone 01-Franklin IL 9329 AMERITECH ILLINOIS 358      
312-846 A Chicago Zone 01-Franklin IL 9329 AMERITECH ILLINOIS 358      
312-917 A Chicago Zone 01-Franklin IL 9329 AMERITECH ILLINOIS 358      
312-920 A Chicago Zone 01-Franklin IL 9329 AMERITECH ILLINOIS 358      
312-960 A Chicago Zone 01-Franklin IL 9329 AMERITECH ILLINOIS 358      
312-977 A Chicago Zone 01-Franklin IL 9329 AMERITECH ILLINOIS 358      

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

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