- Monroe County Courthouse (Monroe)
- Montcalm County Courthouse (Stanton)
- Montmorency County Courthouse (Atlanta)
- Muskegon County Courthouse
- Newago County Courthouse (White Cloud)
- Oakland County Courthouse (Pontiac)
- Oceana Courthouse (Hart)
- Ogemaw County Courthouse (West Branch)
- Old Ontonagon County Courthouse (Ontonagon)
- Ontonagon County Courthouse (Ontonagon)
- Osceola County Courthouse (Reed City)
- Oscoda County Courthouse (Mio)
- Otsego County Courthouse
- Ottawa County Courthouse
- Presque Isle County Courthouse (Rogers City)