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: CHCGILGMDS7

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
847-979 A Elk Grove IL 6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
847-984 A Libertyville IL 6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
847-999 A Winnetka IL 6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
872-249 A Chicago Zone 01-Calumet IL 6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
872-259 A Chicago Zone 01-Calumet IL 6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      
872-263 A Chicago Zone 01-Calumet IL 6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358      

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Last updated: Thu, 01 Jan 2026 03:59:49 UTC

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