Event | Rank | Mark | By | Meet |
| | | National Elites above. State Elites below | | |
B-400 | 1 | 49.04 | Rowell, Jordan (2017) (Immaculate Conception, IL) | IL 1A Boys State Finals(IL), 2015-05-30(#2) |
B-400 | 2 | 50.90 | McKenzie, Marvin (2015) (Riverside-Brookfield, IL) | Metro Suburban West Boys Conference Meet(IL), 2015-05-15(#1) |
B-400 | 3 | 51.73 | Roundtree, Colby (2015) (Chicago Christian, IL) | Carlin Nalley Invitational(IL), 2015-05-09(#2) |
B-400 | 4 | 52.06 | Bastian, Cooper (2018) (Wheaton Academy, IL) | IL 2A Boys State Prelims(IL), 2015-05-29(#20) |
B-400 | 5 | 52.08 | Finnegan, Hunter (Wheaton Academy, IL) | Chicago Christian Invitational(IL), 2015-05-01(#2) |
B-400 | 6 | 52.38 | Walker, Jonathon (2016) (Glenbard South, IL) | Glenbard South Boys Open(IL), 2015-04-11(#1) |
B-400 | 7 | 52.45 | Fiene, Nick (2015) (Illiana Christian, IL) | Metro Suburban East Boys Conference Meet(IL), 2015-05-15(#2) |
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| | | See more performances for B-400 | | |