| Business | Phone |
| Sanilac County Commissioners 60 W Sanilac Rd 213, Sandusky 48471 | (810) 648-2933 |
| Sanilac County Animal Control 35 S Stoutenburg Rd, Sandusky 48471 | (810) 648-4831 |
| Sanilac County Sheriff-Records 65 N Elk St, Sandusky 48471 | (810) 648-2007 |
| Sanilac County Computer Info 60 W Sanilac Rd, Sandusky 48471 | (810) 648-4114 |
| Sanilac County Construction 60 W Sanilac Rd 210, Sandusky 48471 | (810) 648-4664 |
| Sanilac County Drain Comm 60 W Sanilac Rd 201, Sandusky 48471 | (810) 648-4900 |
| Sanilac County Drug Task Force Po Box 15, Sandusky 48471 | (810) 648-4580 |
| Sanilac County Equalization 60 W Sanilac Rd, Sandusky 48471 | (810) 648-2955 |
| Sanilac County Msu Ext 37 Austin St, Sandusky 48471 | (810) 648-2515 |
| Sanilac County Probate Court 60 W Sanilac Rd 103, Sandusky 48471 | (810) 648-3220 |
| Sanilac County Register-Deeds 60 W Sanilac Rd 202, Sandusky 48471 | (810) 648-2313 |
| Sanilac County Road Commission 35 N Flynn St, Sandusky 48471 | (810) 648-2185 |
| Sanilac County Vehicle 60 W Sanilac Rd, Sandusky 48471 | (810) 648-9046 |
| Sanilac County Veterans Affair 171 Dawson St 227, Sandusky 48471 | (810) 648-0212 |