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: CHCGILSUDS2

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
312-951 6 Chicago Zone 01-Superior IL 9329 ILLINOIS BELL TEL CO 358      
312-951 7 Chicago Zone 01-Superior IL 9329 ILLINOIS BELL TEL CO 358      
312-951 8 Chicago Zone 01-Superior IL 9329 ILLINOIS BELL TEL CO 358      
312-951 9 Chicago Zone 01-Superior IL 9329 ILLINOIS BELL TEL CO 358      
312-970 7 Chicago Zone 01-Illinois Dearborn IL 9329 ILLINOIS BELL TEL CO 358   2001-04-23   
312-981 1 Chicago Zone 01-Calumet IL 9329 ILLINOIS BELL TEL CO 358   2001-12-18   
312-981 2 Chicago Zone 01-Calumet IL 9329 ILLINOIS BELL TEL CO 358   2001-12-07   
312-981 3 Chicago Zone 01-Calumet IL 9329 ILLINOIS BELL TEL CO 358   2001-12-07   
312-981 4 Chicago Zone 01-Calumet IL 9329 ILLINOIS BELL TEL CO 358   2000-06-30   
312-981 6 Chicago Zone 01-Calumet IL 9329 ILLINOIS BELL TEL CO 358   2000-06-30   
312-988 A Chicago Zone 01-Superior IL 9329 ILLINOIS BELL TEL CO 358      
312-988 1 Chicago Zone 01-Superior IL 9329 ILLINOIS BELL TEL CO 358      
312-988 2 Chicago Zone 01-Superior IL 9329 ILLINOIS BELL TEL CO 358      
312-988 3 Chicago Zone 01-Superior IL 9329 ILLINOIS BELL TEL CO 358      
312-988 4 Chicago Zone 01-Superior IL 9329 ILLINOIS BELL TEL CO 358      
312-988 5 Chicago Zone 01-Superior IL 9329 ILLINOIS BELL TEL CO 358      
312-988 6 Chicago Zone 01-Superior IL 9329 ILLINOIS BELL TEL CO 358      
312-988 7 Chicago Zone 01-Superior IL 9329 ILLINOIS BELL TEL CO 358      
312-988 8 Chicago Zone 01-Superior IL 9329 ILLINOIS BELL TEL CO 358      
312-988 9 Chicago Zone 01-Superior IL 9329 ILLINOIS BELL TEL CO 358      

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Last updated: Sun, 26 Jan 2025 15:59:20 UTC

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