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| Time | Date | Name | Team | Meet |
|---|---|---|---|---|
| 45.08 | Feb. 9, 2024 | Spencer Nicholas | Martin Luther King High School (Nashville) | TISCA State Championship |
| 46.64 | Feb. 10, 2012 | Maclin Davis | Montgomery Bell Academy | 12 Tennessee Interscholastic Swim Coaches Association Championships |
| 47.14 | Feb. 11, 2011 | Eric Cruz-Murphy | Montgomery Bell Academy | Tennessee Interscholastic Swimming Coaches Assocation State Meet |
| 48.62 | Feb. 13, 2009 | Alex Ward | Webb School Of Knoxville | Tennessee Interscholastic Swimming Coaches Assocation State Meet |
| 50.36 | Feb. 22, 2008 | Brad Hamilton | Baylor School (Chattanooga) | Eastern Interscholastic Swimming Championship |
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