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.

OCN: 6115 LEVEL 3 COMMUNICATIONS, LLC - IL

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 >>

NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
312-548 7 Chicago Zone 01-Calumet IL CHCGILGMDS7  358   2007-10-20   
312-548 8 Chicago Zone 01-Calumet IL CHCGILGMDS7  358   2007-10-20   
312-548 9 Chicago Zone 01-Calumet IL CHCGILGMDS7  358   2007-10-20   
312-579 2 Chicago Zone 01-Calumet IL CHCGILGMDS7  358   2017-09-09   
312-579 3 Chicago Zone 01-Calumet IL CHCGILGMDS7  358   2017-09-09   
312-598 9 Chicago Zone 01-Calumet IL CHCGILGMDS7  358   2019-04-29   
312-602 A Chicago Zone 01-Calumet IL CHCGILGMDS7  358      
312-604 6 Chicago Zone 01-Calumet IL CHCGILGMDS7  358   2002-10-16   
312-612 1 Chicago Zone 01-Canal IL CHCGILGMDS7  358   2000-09-28   
312-612 2 Chicago Zone 01-Canal IL CHCGILGMDS7  358   2000-09-28   
312-614 0 Chicago Zone 01-Calumet IL CHCGILGMDS7  358   2012-12-14   
312-614 1 Chicago Zone 01-Calumet IL CHCGILGMDS7  358   2012-12-14   
312-625 A Chicago Zone 01-Calumet IL CHCGILGMDS7  358      
312-625 5 Chicago Zone 01-Calumet IL CHCGILGMDS7  358   2014-01-26   
312-635 A Chicago Zone 01-Calumet IL   358      
312-635 1 Chicago Zone 01-Calumet IL   358      
312-635 2 Chicago Zone 01-Calumet IL   358      
312-635 4 Chicago Zone 01-Calumet IL CHCGILGMDS7  358      
312-635 5 Chicago Zone 01-Calumet IL CHCGILGMDS7  358      
312-635 6 Chicago Zone 01-Calumet IL CHCGILGMDS7  358      
312-635 7 Chicago Zone 01-Calumet IL CHCGILGMDS7  358      
312-635 8 Chicago Zone 01-Calumet IL CHCGILGMDS7  358      
312-635 9 Chicago Zone 01-Calumet IL CHCGILGMDS7  358      
312-637 A Chicago Zone 01-Calumet IL CHCGILGMDS7  358      
312-637 1 Chicago Zone 01-Calumet IL CHCGILGMDS7  358      
312-637 2 Chicago Zone 01-Calumet IL CHCGILGMDS7  358      
312-637 3 Chicago Zone 01-Calumet IL CHCGILGMDS7  358      
312-637 4 Chicago Zone 01-Calumet IL CHCGILGMDS7  358      
312-637 5 Chicago Zone 01-Calumet IL CHCGILGMDS7  358      
312-637 6 Chicago Zone 01-Calumet IL CHCGILGMDS7  358      
312-637 7 Chicago Zone 01-Calumet IL CHCGILGMDS7  358      
312-637 8 Chicago Zone 01-Calumet IL CHCGILGMDS7  358      
312-637 9 Chicago Zone 01-Calumet IL CHCGILGMDS7  358      
312-638 A Chicago Zone 01-Calumet IL CHCGILGMDS7  358      
312-638 1 Chicago Zone 01-Calumet IL CHCGILGMDS7  358      
312-638 2 Chicago Zone 01-Calumet IL CHCGILGMDS7  358      
312-638 3 Chicago Zone 01-Calumet IL CHCGILGMDS7  358      
312-638 4 Chicago Zone 01-Calumet IL CHCGILGMDS7  358      
312-638 6 Chicago Zone 01-Calumet IL CHCGILGMDS7  358      
312-638 7 Chicago Zone 01-Calumet IL CHCGILGMDS7  358      
312-638 8 Chicago Zone 01-Calumet IL CHCGILGMDS7  358      
312-638 9 Chicago Zone 01-Calumet IL CHCGILGMDS7  358      
312-646 A Chicago Zone 01-Calumet IL CHCGILGMDS7  358      
312-646 1 Chicago Zone 01-Calumet IL CHCGILGMDS7  358   2007-10-01   
312-646 2 Chicago Zone 01-Calumet IL CHCGILGMDS7  358   2007-10-01   
312-646 3 Chicago Zone 01-Calumet IL CHCGILGMDS7  358   2007-10-01   
312-646 4 Chicago Zone 01-Calumet IL CHCGILGMDS7  358   2007-10-01   
312-646 5 Chicago Zone 01-Calumet IL CHCGILGMDS7  358   2007-10-01   
312-647 2 Chicago Zone 01-Calumet IL CHCGILGMDS7  358   2013-07-16   
312-651 3 Chicago Zone 01-Canal IL CHCGILGMDS7  358   2019-12-30   

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 >>

Last updated: Thu, 05 Feb 2026 23:41:55 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.