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: CHCGILFRDS3

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
312-252 6 Chicago Zone 01-Calumet IL 9329 ILLINOIS BELL TEL CO 358   2002-10-14   
312-252 7 Chicago Zone 01-Calumet IL 9329 ILLINOIS BELL TEL CO 358   2003-03-07   
312-263 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-269 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-298 2 Chicago Zone 01-Calumet IL 9329 ILLINOIS BELL TEL CO 358   2001-06-12   
312-298 3 Chicago Zone 01-Calumet IL 9329 ILLINOIS BELL TEL CO 358   2001-06-12   
312-298 4 Chicago Zone 01-Calumet IL 9329 ILLINOIS BELL TEL CO 358   2001-06-12   
312-298 5 Chicago Zone 01-Calumet IL 9329 ILLINOIS BELL TEL CO 358   2001-06-12   
312-298 6 Chicago Zone 01-Calumet IL 9329 ILLINOIS BELL TEL CO 358   2001-06-12   
312-298 7 Chicago Zone 01-Calumet IL 9329 ILLINOIS BELL TEL CO 358   2001-06-12   
312-298 8 Chicago Zone 01-Calumet IL 9329 ILLINOIS BELL TEL CO 358   2001-06-12   
312-324 1 Chicago Zone 01-Calumet IL 9329 ILLINOIS BELL TEL CO 358   2002-06-05   
312-324 2 Chicago Zone 01-Calumet IL 9329 ILLINOIS BELL TEL CO 358   2002-06-05   
312-324 8 Chicago Zone 01-Calumet IL 9329 ILLINOIS BELL TEL CO 358   2002-06-05   
312-324 9 Chicago Zone 01-Calumet IL 9329 ILLINOIS BELL TEL CO 358   2002-06-05   
312-332 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-336 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-345 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-381 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-381 0 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-381 1 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-381 2 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-381 3 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-381 4 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-381 5 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-381 6 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-381 7 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-381 9 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-407 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-419 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-422 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-425 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-429 3 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358   2002-06-05   
312-442 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-442 1 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-442 3 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-442 4 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-442 5 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-442 6 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-442 7 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-442 8 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-442 9 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-460 5 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358   2005-10-03   
312-460 6 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358   2005-10-03   
312-460 7 Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358   2005-10-03   
312-499 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-516 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-558 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-578 A Chicago Zone 01-Franklin IL 9329 ILLINOIS BELL TEL CO 358      
312-609 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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