Event | Rank | Mark | By | Meet |
| | | National Elites above. State Elites below | | |
B-400 | 1 | 48.59 | Harris, Aaron (2016) (Lisle, IL) | USATF JO Region 7 Qualifier(IL), 2015-07-12(#1) |
B-400 | 2 | 50.95 | Weaver, Zach (2018) (Reed-Custer, IL) | IL 1A Boys State Prelims(IL), 2015-05-28(#11) |
B-400 | 3 | 51.02 | Randa, Kody (2015) (Sandwich Community, IL) | IL 2A LaSalle-Peru Boys Sectional(IL), 2015-05-22(#2) |
B-400 | 4 | 51.28 | Brown, Quintin (2015) (Westmont, IL) | IL 1A Boys State Prelims(IL), 2015-05-28(#13) |
B-400 | 5 | 51.43 | Marshall, Michael (2015) (Plano, IL) | Seneca Irish Invitational(IL), 2015-04-17(#1) |
B-400 | 6 | 51.59 | Bailey, B.J. (2015) (Reed-Custer, IL) | Herscher Invitational(IL), 2015-05-01(#1) |
B-400 | 7 | 51.72 | Lidinsky, Marc (Sandwich Community, IL) | IL 2A LaSalle-Peru Boys Sectional(IL), 2015-05-22(#3) |
B-400 | 8 | 51.73 | Maisoneneve, Guy (Manteno, IL) | IL 2A Hillcrest Boys Sectional(IL), 2015-05-22(#3) |
B-400 | 9 | 51.91 | Livingston, Blaine (Dwight, IL) | Seneca Irish Invitational(IL), 2015-04-17(#4) |
B-400 | 10 | 52.28 | Bennett, Michael (2016) (Dwight, IL) | Seneca Irish Invitational(IL), 2015-04-17(#6) |
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| | | See more performances for B-400 | | |