| Business | Phone |
| Mahaska County Court Attendant 106 S 1st St, Oskaloosa 52577 | (641) 673-4405 |
| Mahaska County Judge's Chamber 106 S 1st St, Oskaloosa 52577 | (641) 673-4337 |
| Mahaska County Juvenile Court 106 S 1st St, Oskaloosa 52577 | (641) 673-0419 |
| Mahaska County Magistrate Ct 106 S 1st St, Oskaloosa 52577 | (641) 673-3414 |
| Mahaska County Resident Judge 206 S 1st St, Oskaloosa 52577 | (641) 673-4337 |