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| Time | Date | Name | Team | Meet |
|---|---|---|---|---|
| 48.87 | Feb. 28, 2020 | Seth Miller | Brother Rice High School | IHSA Boys State Championship |
| 49.37 | Feb. 22, 2020 | Seth Miller | Brother Rice High School | IHSA Boys Sectional Championship - Sandburg |
| 49.52 | Feb. 22, 2019 | Seth Miller | Brother Rice High School | IHSA Boys State Championship |
| 50.22 | Feb. 16, 2019 | Seth Miller | Brother Rice High School | IHSA Sectionals - Lockport (Boys) |
| 51.84 | Feb. 2, 2019 | Seth Miller | Brother Rice High School | Metro Catholic Athletic Conference |
| 54.55 | Jan. 5, 2019 | Connor McCarthy | Fenwick High School | 25th Annual Marquette Invitational |
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