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: CHCGILDODS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
773-241 A Chicago Zone 07-Hyde Park IL 9329 AMERITECH ILLINOIS 358      
773-256 A Chicago Zone 07-Hyde Park IL 9329 AMERITECH ILLINOIS 358      
773-288 A Chicago Zone 07-Hyde Park IL 9329 AMERITECH ILLINOIS 358      
773-324 A Chicago Zone 07-Hyde Park IL 9329 AMERITECH ILLINOIS 358      
773-363 A Chicago Zone 07-Hyde Park IL 9329 AMERITECH ILLINOIS 358      
773-493 A Chicago Zone 07-Hyde Park IL 9329 AMERITECH ILLINOIS 358      
773-643 A Chicago Zone 07-Hyde Park IL 9329 AMERITECH ILLINOIS 358      
773-667 A Chicago Zone 07-Hyde Park IL 9329 AMERITECH ILLINOIS 358      
773-684 A Chicago Zone 07-Hyde Park IL 9329 AMERITECH ILLINOIS 358      
773-702 A Chicago Zone 07-Hyde Park IL 9329 AMERITECH ILLINOIS 358      
773-752 A Chicago Zone 07-Hyde Park IL 9329 AMERITECH ILLINOIS 358      
773-753 A Chicago Zone 07-Hyde Park IL 9329 AMERITECH ILLINOIS 358      
773-795 A Chicago Zone 07-Hyde Park IL 9329 AMERITECH ILLINOIS 358      
773-926 A Chicago Zone 07-Hyde Park IL 9329 AMERITECH ILLINOIS 358      
773-947 A Chicago Zone 07-Hyde Park IL 9329 AMERITECH ILLINOIS 358      
773-955 A Chicago Zone 07-Hyde Park IL 9329 AMERITECH ILLINOIS 358      
872-247 A Chicago Zone 07-Stewart IL 9329 AMERITECH ILLINOIS 358   2010-02-06   

Last updated: Sat, 27 Jul 2019 10:59:49 UTC

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