| Business | Phone |
| Central Dispatch 100 E State St, Saint Johns 48879 | (989) 224-3580 |
| Clinton County Administrative 100 E State St 2100, Saint Johns 48879 | (989) 224-5120 |
| Clinton County Animal Control 2638 S Williams Rd, Saint Johns 48879 | (989) 224-5116 |
| Clinton County Msu Extension 100 E State St, Saint Johns 48879 | (989) 224-5240 |
| Clinton County Community Svc 1001 S Oakland St, Saint Johns 48879 | (989) 224-6702 |
| Clinton County Detective Bur 1347 E Townsend Rd, Saint Johns 48879 | (989) 224-5220 |
| Clinton County Drain Cmmssnr 100 E State St 2300, Saint Johns 48879 | (989) 224-5160 |
| Clinton County Equalization 100 W State St, Saint Johns 48879 | (989) 224-5170 |
| Clinton County General Info 100 E State St, Saint Johns 48879 | (989) 224-5100 |
| Clinton County Greenhaven Home 1004 S Swegles St, Saint Johns 48879 | (989) 224-5199 |
| Clinton County Juvenile Div 100 E State St, Saint Johns 48879 | (989) 224-5195 |
| Clinton County Register-Deeds 100 E State St 2500, Saint Johns 48879 | (989) 224-5270 |
| Clinton County Road Commission 3536 S Us Highway 27, Saint Johns 48879 | (989) 224-3274 |
| Clinton County Smith Hall 819 W Park St, Saint Johns 48879 | (989) 224-5247 |
| Clinton County Soil Cnsrvtn 2343 N Us Highway 27, Saint Johns 48879 | (989) 224-8769 |
| County Maintenance Dept 1327 E Townsend Rd, Saint Johns 48879 | (989) 224-5105 |