Celia O'Brien has 2 recorded races from Chicago, Illinois, US.
| Date | Race | Distance | Time | Overall |
|---|---|---|---|---|
| 2023-08-27 | 2023 Chicago Triathlon International | Ultra Marathon | 2:53:58 | 2153 |
| 2022-08-28 | 2022 Chicago Triathlon International - Individual | Ultra Marathon | 3:38:02 | 1940 |