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: CHCGILFRDS1

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
312-574 6 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-574 7 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-574 8 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-634 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-683 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-683 0 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-683 1 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-683 2 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-683 3 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-683 4 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-683 5 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-683 7 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-683 8 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-696 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-696 0 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-696 1 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-696 2 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-696 3 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-696 4 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-696 5 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-696 6 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-696 7 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-696 8 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-793 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-814 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-862 A Chicago Zone 01-Calumet IL 9329 ILLINOIS BELL TEL CO 358      
312-862 0 Chicago Zone 01-Calumet IL 9329 ILLINOIS BELL TEL CO 358   2006-03-18   
312-862 1 Chicago Zone 01-Calumet IL 9329 ILLINOIS BELL TEL CO 358   2006-03-18   
312-862 2 Chicago Zone 01-Calumet IL 9329 ILLINOIS BELL TEL CO 358   2006-03-18   
312-862 3 Chicago Zone 01-Calumet IL 9329 ILLINOIS BELL TEL CO 358   2006-03-18   
312-862 4 Chicago Zone 01-Calumet IL 9329 ILLINOIS BELL TEL CO 358   2006-03-18   
312-862 5 Chicago Zone 01-Calumet IL 9329 ILLINOIS BELL TEL CO 358   2006-03-18   
312-862 6 Chicago Zone 01-Calumet IL 9329 ILLINOIS BELL TEL CO 358   2006-03-18   
312-862 7 Chicago Zone 01-Calumet IL 9329 ILLINOIS BELL TEL CO 358   2006-03-18   
312-862 8 Chicago Zone 01-Calumet IL 9329 ILLINOIS BELL TEL CO 358   2006-03-18   
312-862 9 Chicago Zone 01-Calumet IL 9329 ILLINOIS BELL TEL CO 358   2006-03-18   
312-870 8 Chicago Zone 01-Calumet IL 9329 ILLINOIS BELL TEL CO 358   2000-11-03   
312-904 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-905 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-905 0 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-905 1 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-905 2 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-905 6 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-905 7 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-905 8 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-905 9 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-992 A Chicago Zone 01-Franklin 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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