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: CHCGILTCDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
312-327 A Chicago Zone 01-Franklin IL 7056 XO ILLINOIS, INC. 358      
312-628 A Chicago Zone 01-Franklin IL 7056 XO ILLINOIS, INC. 358      
773-573 A Chicago Zone 07-Hyde Park IL 7056 XO ILLINOIS, INC. 358      

Last updated: Sat, 31 Oct 2020 19:28:10 UTC

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