| Business | Phone |
| Mercer Cnty Common Pleas Court 101 N Main St # 301, Celina 45822 | (419) 586-5089 |
| Mercer Common Pleas Judge 101 N Main St # 301, Celina 45822 | (419) 586-2122 |
| Mercer Juvenile Court Judge 101 N Main St # 307, Celina 45822 | (419) 586-1249 |
| Mercer Probate Judge Office 101 N Main St # 306, Celina 45822 | (419) 586-2418 |