Ortonville is a city in and the county seat of Big Stone County in the U.S. state of Minnesota at the southern tip of Big Stone Lake, along the South Dakota border. The population was 2,021 at the 2020 census. Big Stone Lake State Park is nearby.
History
Ortonville was platted in 1872 by and named for Cornelius Knute Orton. Ortonville was incorporated as a city in 1881.
U.S. Highways 12 and 75 bypass the city and Minnesota State Highway 7 is one of the main routes in the city.