US Highway 131 (US 131) is a north–south United States Highway, of which all but 0.67 of its 269.98 miles (1.08 of 434.49 km) are within the state of Michigan. The highway starts in rural Indiana south of the state line as a state road connection to the Indiana Toll Road. As the road crosses into Michigan it becomes a state trunkline highway that connects to the metropolitan areas of Kalamazoo and Grand Rapids before continuing north to its terminus at Petoskey.