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| Time | Date | Name | Team | Meet |
|---|---|---|---|---|
| 54.99 | Feb. 28, 2020 | Ty Spillane | Marmion Academy | IHSA Boys State Championship |
| 56.36 | Feb. 22, 2020 | Ty Spillane | Marmion Academy | IHSA Boys Sectional Championship - Metea Valley |
| 57.37 | Feb. 22, 2019 | Ty Spillane | Marmion Academy | IHSA Boys State Championship |
| 58.12 | Feb. 16, 2019 | Ty Spillane | Marmion Academy | IHSA Sectionals - Neuqua Valley (Boys) |
| 59.63 | Feb. 2, 2019 | Ty Spillane | Marmion Academy | Metro Catholic Athletic Conference |
| 1:01.57 | Jan. 12, 2019 | Brady Quinlan | Benet Academy | HPHS NISCA Power Point Invite |
| 1:01.67 | Jan. 5, 2019 | Dan Lynch | Fenwick High School | 25th Annual Marquette Invitational |
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