| Event | Rank | Mark | By | Meet |
| | | National Elites above. State Elites below | | |
| B-400 | 1 | 49.80 | Charlton, Brett (2015) (Eureka, IL) | IL 1A Boys State Prelims(IL), 2015-05-28(#3) |
| B-400 | 2 | 50.58 | Stine, Connor (2015) (Olympia, IL) | Mahomet-Seymour Boys Invitational(IL), 2015-05-16(#1) |
| B-400 | 3 | 50.88 | Rieke, Jaxon (2015) (Eureka, IL) | IL 1A Boys State Prelims(IL), 2015-05-28(#10) |
| B-400 | 4 | 52.15 | Hari, Connor (Normal University, IL) | Bloomington/Normal Intercity Classic(IL), 2015-04-28(#4) |
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| | | See more performances for B-400 | | |
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