Indiana State Route 931 runs north-south along a former alignment of U.S. Rt. 31 in St. Joseph County. It runs from the South Bend City Limits, south to the Marshall/St. Joseph County Line. IN St Rt 931 passes through the following town in St. Joseph County. Lakeville IN St Rt 931 is not multi-plexed in St. Joseph County. IN St Rt 931 crosses the following highways. U.S. Rt. 31, near Lakeville. (NO Interchange) Indiana State Route 4, at Lakeville.