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| Time | Date | Name | Team | Meet |
|---|---|---|---|---|
| 43.15 | Feb. 23, 2024 | Brady Johnson | West Chicago Community High School | IHSA Boys State Championship |
| 43.68 | March 13, 2021 | Connor Boyle | Neuqua Valley High School | DVC Championship Varsity |
| 43.73 | Feb. 12, 2014 | Ryan Held | Sacred Heart Griffin High School | 14 Illinois Boys Non-State Best Times |
| 44.06 | Feb. 27, 2009 | Kevin Overholt | Neuqua Valley High School | 09 Illinois Boys State Championships |
| 45.07 | Feb. 24, 2006 | Brian Alden | Neuqua Valley High School | Illinois State High School Championships |
| 45.61 | Feb. 27, 2004 | Dave Kormushoff | Hinsdale Central High School | IHSA Boys State Championships |
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