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: CHCGILWBDS0

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
312-789 1 Chicago Zone 01-Wabash IL 9329 ILLINOIS BELL TEL CO 358      
312-789 2 Chicago Zone 01-Wabash IL 9329 ILLINOIS BELL TEL CO 358      
312-789 3 Chicago Zone 01-Wabash IL 9329 ILLINOIS BELL TEL CO 358      
312-789 6 Chicago Zone 01-Wabash IL 9329 ILLINOIS BELL TEL CO 358      
312-789 7 Chicago Zone 01-Wabash IL 9329 ILLINOIS BELL TEL CO 358      
312-789 8 Chicago Zone 01-Wabash IL 9329 ILLINOIS BELL TEL CO 358      
312-789 9 Chicago Zone 01-Wabash IL 9329 ILLINOIS BELL TEL CO 358      
312-823 A Chicago Zone 01-Wabash IL 9329 ILLINOIS BELL TEL CO 358      
312-823 1 Chicago Zone 01-Wabash IL 9329 ILLINOIS BELL TEL CO 358      
312-886 A Chicago Zone 01-Wabash IL 9329 ILLINOIS BELL TEL CO 358      
312-939 A Chicago Zone 01-Wabash IL 9329 ILLINOIS BELL TEL CO 358      
312-983 A Chicago Zone 01-Wabash IL 9329 ILLINOIS BELL TEL CO 358      
312-983 1 Chicago Zone 01-Wabash IL 9329 ILLINOIS BELL TEL CO 358      
312-983 4 Chicago Zone 01-Wabash IL 9329 ILLINOIS BELL TEL CO 358      
312-983 5 Chicago Zone 01-Wabash IL 9329 ILLINOIS BELL TEL CO 358      
312-983 6 Chicago Zone 01-Wabash IL 9329 ILLINOIS BELL TEL CO 358      
312-983 7 Chicago Zone 01-Wabash IL 9329 ILLINOIS BELL TEL CO 358      
312-983 8 Chicago Zone 01-Wabash IL 9329 ILLINOIS BELL TEL CO 358      
312-983 9 Chicago Zone 01-Wabash 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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