Minnesota State Highway 45 (MN 45) is a short highway in northeast Minnesota, which runs from its intersection with State Highway 210 (Chestnut Avenue) and Carlton County Road 1 in the city of Carlton and continues north to its northern terminus at its interchange with Interstate 35 and Carlton County Highway 45 in the city of Scanlon.The route is 2.6 miles (4.2 km) in length and passes through the city of Carlton.