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: CHCGILSCDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
773-221 A Chicago Zone 09-South Chicago IL 9329 ILLINOIS BELL TEL CO 358      
773-356 A Chicago Zone 09-South Chicago IL 9329 ILLINOIS BELL TEL CO 358      
773-359 5 Chicago Zone 09-South Chicago IL 9329 ILLINOIS BELL TEL CO 358      
773-374 A Chicago Zone 09-South Chicago IL 9329 ILLINOIS BELL TEL CO 358      
773-375 A Chicago Zone 09-South Chicago IL 9329 ILLINOIS BELL TEL CO 358      
773-721 A Chicago Zone 09-South Chicago IL 9329 ILLINOIS BELL TEL CO 358      
773-731 A Chicago Zone 09-South Chicago IL 9329 ILLINOIS BELL TEL CO 358      
773-734 A Chicago Zone 09-South Chicago IL 9329 ILLINOIS BELL TEL CO 358      
773-768 A Chicago Zone 09-South Chicago IL 9329 ILLINOIS BELL TEL CO 358      
773-933 A Chicago Zone 09-South Chicago IL 9329 ILLINOIS BELL TEL CO 358      
773-967 1 Chicago Zone 09-South Chicago IL 9329 ILLINOIS BELL TEL CO 358      
773-967 2 Chicago Zone 09-South Chicago IL 9329 ILLINOIS BELL TEL CO 358      
773-967 3 Chicago Zone 09-South Chicago IL 9329 ILLINOIS BELL TEL CO 358      
773-967 4 Chicago Zone 09-South Chicago IL 9329 ILLINOIS BELL TEL CO 358      
773-967 5 Chicago Zone 09-South Chicago IL 9329 ILLINOIS BELL TEL CO 358      
773-967 6 Chicago Zone 09-South Chicago IL 9329 ILLINOIS BELL TEL CO 358      
773-978 A Chicago Zone 09-South Chicago IL 9329 ILLINOIS BELL TEL CO 358      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

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