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: CHCGILDTDMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
312-270 7 Chicago Zone 01-Calumet IL 156J RCLEC, INC. 358   2017-03-10   
312-690 A Chicago Zone 01-Calumet IL 156J RCLEC, INC. 358      
312-690 4 Chicago Zone 01-Calumet IL 156J RCLEC, INC. 358   2014-07-03   
312-858 A Chicago Zone 01-Calumet IL 156J RCLEC, INC. 358      
312-858 1 Chicago Zone 01-Calumet IL 156J RCLEC, INC. 358   2016-02-20   
312-858 2 Chicago Zone 01-Calumet IL 156J RCLEC, INC. 358   2016-02-20   
312-858 3 Chicago Zone 01-Calumet IL 156J RCLEC, INC. 358   2016-02-20   
312-858 4 Chicago Zone 01-Calumet IL 156J RCLEC, INC. 358   2016-02-20   
312-858 5 Chicago Zone 01-Calumet IL 156J RCLEC, INC. 358   2016-02-20   
312-858 6 Chicago Zone 01-Calumet IL 156J RCLEC, INC. 358   2016-02-20   
312-858 7 Chicago Zone 01-Calumet IL 156J RCLEC, INC. 358   2016-02-20   
312-858 8 Chicago Zone 01-Calumet IL 156J RCLEC, INC. 358   2016-02-20   
312-858 9 Chicago Zone 01-Calumet IL 156J RCLEC, INC. 358   2016-02-20   
773-832 7 Chicago Zone 04-Lakeview IL 156J RCLEC, INC. 358   2017-09-14   

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

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