| Mercer County | pop. 3,723 |
| County Commission Meets: | Each Monday |
| County Courthouse: | Mercer, MO 64673 |
| Phone: | (660) 748-3425 |
| Presiding Commissioner: | Clifford Shipley |
| Associate Commissioner: | Rudy Finney |
| Associate Commissioner: | Bob Jones |
| County Clerk: | Carolyn Kost |
| Circuit Clerk & Ex-officio Recorder: | Patricia Stamper |
| Prosecuting Attorney: | Jay Hemmenway |
| Sheriff: | Duane Hobbs |
| Associate Circuit Judge, Div. II: | Bradley Funck |
| Treasurer & Ex-officio Collector: | Ray Woodward |
| Coroner: | Michael Greenlee |
| Health Department: | Phyllis Johnson |
| Assessor: | Norberta DeMoss |
| Public Administrator: | Carolyn Sealine |