StadiumUnion Park
| Current capacity of the stadium |
| Standing | 38 700 |
| Seats | 24 200 |
| Tribune | 14 500 |
| Seats for sponsors | 500 |
| Fans attended |
| 23. 7. 2026 | ASK Union Marchtrenk-Köflach | 14 277 |
| 21. 7. 2026 | ASK Union Marchtrenk-Notts County FC | 15 562 |
| 21. 7. 2026 | ASK Union Marchtrenk-Notts County FC | 16 966 |
| 21. 7. 2026 | ASK Union Marchtrenk-Notts County FC | 14 797 |
| 18. 7. 2026 | ASK Union Marchtrenk-Wolfsberger AC | 12 814 |
| 14. 7. 2026 | ASK Union Marchtrenk-FC Bad Gastein | 15 882 |
| 14. 7. 2026 | ASK Union Marchtrenk-FC Bad Gastein | 16 596 |
| 14. 7. 2026 | ASK Union Marchtrenk-FC Bad Gastein | 16 861 |
| 14. 7. 2026 | ASK Union Marchtrenk-ASK Admira Baumgarten | 14 361 |