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.

[3][6] Big Stone Lake State Park is nearby.

Ortonville was platted in 1872 by Cornelius Knute Orton, and named for him.

There were 1,090 housing units at an average density of 310.5 per square mile (119.9/km2).

38.6% of all households were made up of individuals, and 21.2% had someone living alone who was 65 years of age or older.

There were 1,125 housing units at an average density of 331.4 per square mile (128.0/km2).

33.6% of all households were made up of individuals, and 20.4% had someone living alone who was 65 years of age or older.

The schools are housed in one building, making the public education in Ortonville K-12.

Ortonville's athletic teams are called the Trojans, and the school's colors are orange and black.