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: CHCGILHBDS1

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
773-227 A Chicago Zone 04-Humboldt IL 9329 AMERITECH ILLINOIS 358      
773-235 A Chicago Zone 04-Humboldt IL 9329 AMERITECH ILLINOIS 358      
773-252 A Chicago Zone 04-Humboldt IL 9329 AMERITECH ILLINOIS 358      
773-276 A Chicago Zone 04-Humboldt IL 9329 AMERITECH ILLINOIS 358      
773-278 A Chicago Zone 04-Humboldt IL 9329 AMERITECH ILLINOIS 358      
773-292 A Chicago Zone 04-Humboldt IL 9329 AMERITECH ILLINOIS 358      
773-342 A Chicago Zone 04-Humboldt IL 9329 AMERITECH ILLINOIS 358      
773-384 A Chicago Zone 04-Humboldt IL 9329 AMERITECH ILLINOIS 358      
773-394 A Chicago Zone 04-Humboldt IL 9329 AMERITECH ILLINOIS 358      
773-395 A Chicago Zone 04-Humboldt IL 9329 AMERITECH ILLINOIS 358      
773-486 A Chicago Zone 04-Humboldt IL 9329 AMERITECH ILLINOIS 358      
773-489 A Chicago Zone 04-Humboldt IL 9329 AMERITECH ILLINOIS 358      
773-645 A Chicago Zone 04-Humboldt IL 9329 AMERITECH ILLINOIS 358      
773-772 A Chicago Zone 04-Humboldt IL 9329 AMERITECH ILLINOIS 358      
773-782 A Chicago Zone 04-Humboldt IL 9329 AMERITECH ILLINOIS 358      
773-862 A Chicago Zone 04-Humboldt IL 9329 AMERITECH ILLINOIS 358      

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

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