| Business | Phone |
| Caledonia Sewer Authority 135 N State Rd, Owosso 48867 | (989) 743-3181 |
| Caledonia Township Hall 135 N State Rd, Owosso 48867 | (989) 743-5300 |
| Owosso Fire Dept 202 S Water St, Owosso 48867 | (989) 725-0590 |
| Owosso City Garage 522 Milwaukee St, Owosso 48867 | (989) 725-0556 |
| Owosso Curwood Castle 226 Curwood Castle Dr, Owosso 48867 | (989) 725-0597 |
| Owosso Curwood Castle 301 W Main St, Owosso 48867 | (989) 725-0597 |
| Owosso Public Works Dept 301 W Main St, Owosso 48867 | (989) 725-0550 |
| Owosso Personnel Dept 301 W Main St, Owosso 48867 | (989) 725-0565 |
| Owosso Twp Business Office 2998 W M 21, Owosso 48867 | (989) 723-2187 |
| Owosso Twp Clerks Office 2002 N M 52, Owosso 48867 | (989) 725-1709 |
| Owosso Twp Rescue Office 100 N Smith Rd, Owosso 48867 | (989) 723-5890 |