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: BNSVILDGDS0

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
872-345 8 Chicago Zone 01-Calumet IL 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358   2021-04-28   
872-899 3 Chicago Zone 01-Calumet IL 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358   2021-10-22   

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Last updated: Sat, 02 May 2026 12:20:53 UTC

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