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: CHCGILMODS1

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
312-947 6 Chicago Zone 01-Calumet IL 9329 ILLINOIS BELL TEL CO 358   2010-12-18   
312-947 7 Chicago Zone 01-Calumet IL 9329 ILLINOIS BELL TEL CO 358   2010-12-18   
312-947 8 Chicago Zone 01-Calumet IL 9329 ILLINOIS BELL TEL CO 358   2010-12-18   
312-947 9 Chicago Zone 01-Calumet IL 9329 ILLINOIS BELL TEL CO 358   2010-12-18   
312-996 A Chicago Zone 01-Monroe IL 9329 ILLINOIS BELL TEL CO 358      
312-997 A Chicago Zone 01-Monroe IL 9329 ILLINOIS BELL TEL CO 358      
312-997 0 Chicago Zone 01-Monroe IL 9329 ILLINOIS BELL TEL CO 358      
312-997 1 Chicago Zone 01-Monroe IL 9329 ILLINOIS BELL TEL CO 358      
312-997 2 Chicago Zone 01-Monroe IL 9329 ILLINOIS BELL TEL CO 358      
312-997 3 Chicago Zone 01-Monroe IL 9329 ILLINOIS BELL TEL CO 358      
312-997 4 Chicago Zone 01-Monroe IL 9329 ILLINOIS BELL TEL CO 358      
312-997 6 Chicago Zone 01-Monroe IL 9329 ILLINOIS BELL TEL CO 358      
312-997 7 Chicago Zone 01-Monroe IL 9329 ILLINOIS BELL TEL CO 358      
312-997 8 Chicago Zone 01-Monroe IL 9329 ILLINOIS BELL TEL CO 358      
312-997 9 Chicago Zone 01-Monroe IL 9329 ILLINOIS BELL TEL CO 358      

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Last updated: Tue, 16 Apr 2024 01:38:01 UTC

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