Brendan Hallahan has 2 recorded races from Washington, DC, US.
| Date | Race | Distance | Time | Overall |
|---|---|---|---|---|
| 2025-03-15 | 2025 Rock 'n' Roll Washington DC Half Marathon | Half Marathon | 1:55:00 | 3065 |
| 2023-03-18 | 2023 Rock 'n' Roll DC Half Marathon | Half Marathon | 1:55:49 | 2790 |