Ortonville is a city in Big Stone and Lac qui Parle counties in Minnesota at the southern tip of Big Stone Lake, along the border with South Dakota. It is the county seat of Big Stone County. Big Stone Lake State Park is nearby.
Ortonville was platted in 1872 by Cornelius Knute Orton, and named for him. Ortonville was incorporated as a city in 1881. Big Stone County is situated on the western border of the State almost midway between the north and south boundaries. It has Traverse County and a part of Stevens County on the north, Stevens and Swift Counties on the east, Lac qui Parle County and the Minnesota River on the south, and the Minnesota River, Big Stone Lake and the State of South Dakota on the west. On March 2011 a study done by the University of Wisconsin and the Robert Wood Johnson Foundation ranked Lac qui Parle County the healthiest county in Minnesota.