| Temporada | Equipo | Competición | PJ | G | A | Nota | ||
|---|---|---|---|---|---|---|---|---|
| 2026 | Waterford | Premier Division | 6 | 1 | 0 | 1 | 0 | 7.0 |
| 2025 | Sligo Rovers | Premier Division | 10 | 0 | 0 | 5 | 0 | 6.9 |
| 2024 | Sligo Rovers | Premier Division | 1 | 0 | 0 | 0 | 0 | 6.9 |
| 2023 | Sligo Rovers | Premier Division | 5 | 0 | 0 | 1 | 0 | 6.7 |
| 2021/2022 | St Johnstone | Premiership | 3 | 0 | 0 | 0 | 0 | 6.7 |
| 2021 | Sligo Rovers | Premier Division | 32 | 1 | 0 | 5 | 0 | – |
| 2020 | Sligo Rovers | Premier Division | 3 | 0 | 0 | 2 | 0 | – |
| 2019 | Sligo Rovers | Premier Division | 34 | 0 | 0 | 8 | 0 | – |
| 2018 | Sligo Rovers | Premier Division | 24 | 1 | 0 | 7 | 1 | – |
| Total | 118 | 3 | 0 | 29 | 1 | – | ||
| Fecha | Desde | Hacia | Tipo | |
|---|---|---|---|---|
| 01 ene 2026 | Sligo Rovers | Waterford | Free agent | |
| - | St Johnstone | Sligo Rovers | Free agent | |
| - | Sligo Rovers | St Johnstone | Transfer |
J. Mahon career history shows progression across clubs and competitions, including club timeline, national team appearances and overall career totals.