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| Time | Date | Name | Team | Meet |
|---|---|---|---|---|
| 45.04 | Feb. 22, 2020 | Mitchell Mages | Carthage College | College Conference of Illinois & Wisconsin Championships |
| 45.33 | Feb. 13, 2016 | Jack O'Connor | Wheaton College (Illinois) | College Conference of Illinois & Wisconsin Championships |
| 45.49 | Dec. 4, 2015 | Jack O'Connor | Wheaton College (Illinois) | Wheaton Invitational |
| 45.58 | Feb. 16, 2008 | Bryce Davis | Carthage College | CCIW Championships |
| 45.73 | March 18, 2006 | Sam Gyorfi | Wheaton College (Illinois) | NCAA Division III Mens Championships |
| 46.48 | Feb. 16, 2002 | Chris Kamienski | Wheaton College (Illinois) | CCIW Championships |
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