U.S. Federal Route 20 is a east-west highway across Central St. Joseph County. From the La Porte/St. Joseph County Line to the St. Joseph Valley Parkway. At the South Bend Metro Area, U.S. Rt. 20 runs along the St. Joseph Valley Parkway on the west and southside of town. U.S. Rt. 20 passes through the following towns in St. Joseph County. New Carlisle
Plainfield South Bend
U.S. Rt. 20 is multi-plexed in St. Joseph County. U.S. Rt. 31, at South Bend.