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: CHCGIL24XMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
224-335 A Antioch IL 495J STRATUS NETWORKS 358      
224-350 A Evanston IL 495J STRATUS NETWORKS 358      
312-530 A Chicago Zone 01-Calumet IL 495J STRATUS NETWORKS 358      
708-726 A Peotone IL 495J STRATUS NETWORKS 358      
708-729 A Palos Park IL 495J STRATUS NETWORKS 358      
708-734 A Summit IL 495J STRATUS NETWORKS 358      
779-291 A Wonder Lake IL 495J STRATUS NETWORKS 358      
779-292 A Onarga IL 495J STRATUS NETWORKS 358      
779-293 A New Lenox IL 495J STRATUS NETWORKS 358      
779-294 A Harding IL 495J STRATUS NETWORKS 358      
779-295 A Mazon IL 495J STRATUS NETWORKS 358      
779-326 A Dwight IL 495J STRATUS NETWORKS 358      
872-272 A Chicago Zone 04-Humboldt IL 495J STRATUS NETWORKS 358      

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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