State Route 18 is an east–west highway in northern Ohio. It is the sixth longest state route in the state. Its western terminus is at the Indiana state line near Hicksville, where the route continues in Indiana as State Road 8, and its eastern terminus is at State Route 91 in Akron.

Ohio State Route 193 is a north–south state highway in the northeastern portion of the U.S. state of Ohio. Its southern terminus is at an interchange with I-680 in Youngstown, and its northern terminus is at OH 531 in North Kingsville.