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: CHCGILFRDS0

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
312-201 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-220 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-230 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-230 0 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-230 1 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-230 2 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-230 3 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-230 4 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-230 5 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-230 6 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-230 7 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-230 9 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-251 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-267 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-267 3 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-267 5 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358   2002-06-04   
312-267 6 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358   2002-06-04   
312-267 8 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358   2002-06-04   
312-325 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-325 0 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358   2003-07-25   
312-325 1 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358   2003-07-25   
312-325 2 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358   2003-07-25   
312-325 3 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358   2003-07-25   
312-325 4 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358   2003-07-25   
312-325 5 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358   2003-07-25   
312-325 6 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358   2003-07-25   
312-325 7 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358   2003-07-25   
312-325 8 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358   2003-07-25   
312-325 9 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358   2003-07-25   
312-357 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-368 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-395 1 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358   2003-05-21   
312-395 2 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358   2003-01-06   
312-395 3 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358   2003-01-06   
312-395 4 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358   2003-01-06   
312-443 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-443 0 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-443 1 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-443 3 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-443 4 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-443 5 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-443 6 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-443 7 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-443 8 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-443 9 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-444 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-444 1 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-444 2 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-444 3 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-444 4 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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