State Route 61 (SR 61) is a north–south state highway in the northern portion of the U.S. state of Ohio. Its southern terminus is at the U.S. Route 36/State Route 3 concurrency in Sunbury, and its northern terminus is at U.S. Route 6 east of Huron, at the southernmost point of Lake Erie (which is subsequently the southernmost northern border of the United States). State Route 61 is routed through the communities of Mount Gilead, Galion, Crestline, Shelby, Plymouth, Norwalk, and Berlin Heights.