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| Time | Date | Name | Team | Meet |
|---|---|---|---|---|
| 43.91 | Feb. 28, 2020 | Luke Maurer | Loyola Academy | IHSA Boys State Championship |
| 44.33 | Feb. 22, 2019 | Luke Maurer | Loyola Academy | IHSA Boys State Championship |
| 46.12 | Feb. 16, 2019 | Luke Maurer | Loyola Academy | IHSA Sectionals - Niles North (Boys) |
| 46.58 | Feb. 2, 2019 | Liam Hutchinson | Fenwick High School | Metro Catholic Athletic Conference |
| 48.82 | Jan. 12, 2019 | Nick Tommasone | Benet Academy | HPHS NISCA Power Point Invite |
| 50.17 | Jan. 5, 2019 | Dan Bajda | Fenwick High School | 25th Annual Marquette Invitational |
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