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.

State Route 91, formerly known as Inter-county Highway 91 until 1921 and State Highway 91 in 1922, is a north–south state highway in the northeastern portion of the U.S. state of Ohio. Its southern terminus is at U.S. Route 224 in Springfield Township, east of Akron. Its northern terminus is at State Route 283 on the Timberlake/Eastlake border less than one mile (1.6 km) south of Lake Erie.