| Name | Time | Date | Meet |
|---|---|---|---|
| Matt Veldman | 45.78 | Feb. 24, 2012 | 2011-12 Illinois Boys High School State Championships |
| John Wilson | 46.17 | Feb. 27, 2009 | 2008-09 Illinois Boys State Championships |
| Frank Kuchta | 48.72 | Feb. 24, 2006 | Illinois State High School Championships |
| Frank Kuchta | 50.21 | Feb. 27, 2004 | 2004 IHSA Boys State Championships |
