Michigan State Route 103 runs a short distance in St. Joseph County. It runs from the Cass/St. Joseph County Line to U.S. Rt. 12 at Mottville. MI St Rt 103 passes through the following town in St. Joseph County. Mottville
MI St Rt 103 is not multi-plexed in St. Joseph County. MI St Rt 103 intersects the following highways in St. Joseph County. U.S. Rt. 12, at Mottville.
The northern end of MI St Rt 103 at U.S. Rt. 12 in Mottville. The northern end marker.
