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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Joliet West, IL

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
815-725 A JOLTILJWDS0  9329 ILLINOIS BELL TEL CO 358      
815-729 A JOLTILJWDS0  9329 ILLINOIS BELL TEL CO 358      
815-730 A JOLTILJWDS0  9329 ILLINOIS BELL TEL CO 358      
815-741 A JOLTILJWDS0  9329 ILLINOIS BELL TEL CO 358      
815-744 A JOLTILJWDS0  9329 ILLINOIS BELL TEL CO 358      
815-773 A JOLTILJWDS0  9329 ILLINOIS BELL TEL CO 358      

Last updated: Fri, 25 Jul 2025 03:21:23 UTC

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