| Business | Phone |
| Cambridge Township Hall 302 Connor St, Onsted 49265 | (517) 467-2104 |
| Onsted Village Clerk Office 108 S Main St, Onsted 49265 | (517) 467-4618 |
| Onsted Village Dpw 125 W 2nd St, Onsted 49265 | (517) 467-2158 |
| Rome Township Hall Onsted Hwy & Stoddard Rdamp;, Onsted 49265 | (517) 467-6780 |