Marissa Osterkamp has 3 recorded races from Saint Charles, Missouri, US.
| Date | Race | Distance | Time | Overall |
|---|---|---|---|---|
| 2025-10-05 | MO' Cowbell Marathon/Half-Marathon/10K/5K | 10K | 1:10:49 | 448 |
| 2023-10-01 | MO' Cowbell Marathon/Half-Marathon/10K/5K | 10K | 1:10:36 | 285 |
| 2023-05-20 | 14th Annual Ferguson Twilight Run 5k Run/Walk | 5K | 33:00 | 99 |