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.
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Switch: CHCGILCPDS9

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
312-754 A Chicago Zone 01-Calumet IL 138G LEVEL 3 TELECOM OF ILLINOIS, LLC - IL 358      
872-903 A Chicago Zone 09-South Chicago IL 138G LEVEL 3 TELECOM OF ILLINOIS, LLC - IL 358      
872-985 A Chicago Zone 02-Edgewater IL 138G LEVEL 3 TELECOM OF ILLINOIS, LLC - IL 358      

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

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