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.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

Switch: CHCGILPRDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
773-434 A Chicago Zone 08-Prospect IL 9329 ILLINOIS BELL TEL CO 358      
773-436 A Chicago Zone 08-Prospect IL 9329 ILLINOIS BELL TEL CO 358      
773-471 A Chicago Zone 08-Prospect IL 9329 ILLINOIS BELL TEL CO 358      
773-476 A Chicago Zone 08-Prospect IL 9329 ILLINOIS BELL TEL CO 358      
773-737 A Chicago Zone 08-Prospect IL 9329 ILLINOIS BELL TEL CO 358      
773-776 A Chicago Zone 08-Prospect IL 9329 ILLINOIS BELL TEL CO 358      
773-778 A Chicago Zone 08-Prospect IL 9329 ILLINOIS BELL TEL CO 358      
773-863 A Chicago Zone 08-Prospect IL 9329 ILLINOIS BELL TEL CO 358      
773-863 0 Chicago Zone 08-Prospect IL 9329 ILLINOIS BELL TEL CO 358      
773-863 1 Chicago Zone 08-Prospect IL 9329 ILLINOIS BELL TEL CO 358      
773-863 4 Chicago Zone 08-Prospect IL 9329 ILLINOIS BELL TEL CO 358      
773-863 5 Chicago Zone 08-Prospect IL 9329 ILLINOIS BELL TEL CO 358      
773-863 6 Chicago Zone 08-Prospect IL 9329 ILLINOIS BELL TEL CO 358      
773-863 7 Chicago Zone 08-Prospect IL 9329 ILLINOIS BELL TEL CO 358      
773-863 8 Chicago Zone 08-Prospect IL 9329 ILLINOIS BELL TEL CO 358      
773-863 9 Chicago Zone 08-Prospect IL 9329 ILLINOIS BELL TEL CO 358      
773-918 A Chicago Zone 08-Prospect IL 9329 ILLINOIS BELL TEL CO 358      
773-918 0 Chicago Zone 08-Prospect IL 9329 ILLINOIS BELL TEL CO 358      
773-918 1 Chicago Zone 08-Prospect IL 9329 ILLINOIS BELL TEL CO 358      
773-918 3 Chicago Zone 08-Prospect IL 9329 ILLINOIS BELL TEL CO 358      
773-918 4 Chicago Zone 08-Prospect IL 9329 ILLINOIS BELL TEL CO 358      
773-918 6 Chicago Zone 08-Prospect IL 9329 ILLINOIS BELL TEL CO 358      
773-918 7 Chicago Zone 08-Prospect IL 9329 ILLINOIS BELL TEL CO 358      
773-918 8 Chicago Zone 08-Prospect IL 9329 ILLINOIS BELL TEL CO 358      
773-925 A Chicago Zone 08-Prospect IL 9329 ILLINOIS BELL TEL CO 358      

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

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