William O'Brien has 3 recorded races from Chicago, Illinois, US.
| Date | Race | Distance | Time | Overall |
|---|---|---|---|---|
| 2026-03-14 | YMCA St. Patrick's Day Run 1 Mile | 1 Mile | 09:19 | 45 |
| 2023-11-23 | Life Time Turkey Trot Chicago 5K & 8K | 5K | 42:42 | 2993 |
| 2023-07-04 | 40th Annual Brentwood Firecracker 5K | 5K | 22:21 | 154 |