| Event | Rank | Mark | By | Meet |
| B-400 | 1 | 47.53 | Hertz, Cory (2015) (Lakes, IL) (US#51) | IL 3A Boys State Finals(IL), 2015-05-30(#2) |
| | | National Elites above. State Elites below | | |
| B-400 | 2 | 49.07 | Edwards, Michael (2016) (Zion-Benton Twnshp, IL) | IL 3A Palatine Boys Sectional(IL), 2015-05-21(#2) |
| B-400 | 3 | 49.55 | Vestuto, Tim (2015) (Adlai E Stevenson, IL) | IL 3A Palatine Boys Sectional(IL), 2015-05-21(#3) |
| B-400 | 4 | 50.05 | Walker, Isaac (2015) (Warren Township, IL) | Deerfield Boys Invitational(IL), 2015-04-11(#1) |
| B-400 | 5 | 50.91 | Theel, Tyler (2016) (Wauconda Comm, IL) | IL 2A Richmond-Burton Boys Sectional(IL), 2015-05-22(#3) |
| B-400 | 6 | 51.15 | Slovak, Eric (2015) (Vernon Hills, IL) | IL 2A Richmond-Burton Boys Sectional(IL), 2015-05-22(#4) |
| B-400 | 7 | 51.16 | Quinn, Pat (2015) (Libertyville, IL) | Al Janulis Relays(IL), 2015-04-18(#2) |
| B-400 | 8 | 51.49 | Balliu, Jake (2015) (Lakes, IL) | Bartlett Flyin Hawk Invitational(IL), 2015-04-18(#3) |
| B-400 | 9 | 51.94 | Mosley, Thomas (2017) (Zion-Benton Twnshp, IL) | Jane Dickens Invitational(IL), 2015-06-20(#1) |
| B-400 | 10 | 52.31 | Peterson, Thomas (2015) (Libertyville, IL) | IL 3A Palatine Boys Sectional(IL), 2015-05-21(#6) |
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| | | See more performances for B-400 | | |
