John Williamson has 4 recorded races from Chicago, Illinois, US.
| Date | Race | Distance | Time | Overall |
|---|---|---|---|---|
| 2025-08-23 | 2025 Chicago Triathlon Olympic | Ultra Marathon | 3:26:57 | 1917 |
| 2024-08-24 | 2024 Chicago Triathlon Sprint | 2:16:43 | 1456 | |
| 2023-08-27 | 2023 Chicago Triathlon Sprint | 1:47:31 | 1454 | |
| 2022-08-28 | 2022 Chicago Triathlon International - Individual | Ultra Marathon | 3:40:03 | 1985 |