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| Time | Date | Name | Team | Meet |
|---|---|---|---|---|
| 49.89 | Nov. 18, 2022 | Sophia Guo | Pioneer High School | MHSAA Division 1 State Championships |
| 50.07 | Nov. 17, 2017 | Jojo Jorgenson | Saline High School | MHSAA Girls Division 1 State Championship |
| 50.45 | Oct. 14, 2017 | Jojo Jorgenson | Saline High School | Girls HS MISCA Meet |
| 50.50 | Nov. 18, 2016 | Jojo Jorgenson | Saline High School | Michigan Girls Division 1 State Championships |
| 51.32 | Oct. 8, 2016 | Emma Cleason | Skyline High School | MISCA Girls Invitational |
| 52.40 | Sept. 17, 2016 | Emma Cleason | Skyline High School | Skyline vs. Rockford vs. Pioneer |
| 52.44 | Aug. 25, 2016 | Maddie Luther | Saline High School | 15th Annual Huron Relays |
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