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: CHCGILLADS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
773-247 A Chicago Zone 06-Lafayette IL 9329 ILLINOIS BELL TEL CO 358      
773-254 A Chicago Zone 06-Lafayette IL 9329 ILLINOIS BELL TEL CO 358      
773-376 A Chicago Zone 06-Lafayette IL 9329 ILLINOIS BELL TEL CO 358      
773-523 A Chicago Zone 06-Lafayette IL 9329 ILLINOIS BELL TEL CO 358      
773-534 A Chicago Zone 06-Lafayette IL 9329 ILLINOIS BELL TEL CO 358      
773-535 A Chicago Zone 06-Lafayette IL 9329 ILLINOIS BELL TEL CO 358      
773-553 A Chicago Zone 06-Lafayette IL 9329 ILLINOIS BELL TEL CO 358      
773-579 A Chicago Zone 06-Lafayette IL 9329 ILLINOIS BELL TEL CO 358      
773-650 A Chicago Zone 06-Lafayette IL 9329 ILLINOIS BELL TEL CO 358      
773-674 A Chicago Zone 06-Kedzie IL 9329 ILLINOIS BELL TEL CO 358      
773-801 A Chicago Zone 06-Kedzie IL 9329 ILLINOIS BELL TEL CO 358      
773-843 A Chicago Zone 06-Lafayette IL 9329 ILLINOIS BELL TEL CO 358      
773-847 A Chicago Zone 06-Lafayette IL 9329 ILLINOIS BELL TEL CO 358      
773-869 A Chicago Zone 06-Lafayette IL 9329 ILLINOIS BELL TEL CO 358      
773-890 A Chicago Zone 06-Lafayette IL 9329 ILLINOIS BELL TEL CO 358      
773-927 A Chicago Zone 06-Lafayette IL 9329 ILLINOIS BELL TEL CO 358      

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

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