Ortonville is a city in Big Stone County in the U.S. state of Minnesota at the southern tip of Big Stone Lake, along the border with South Dakota. The population was 1,916 at the 2010 census. It is the county seat of Big Stone County. Big Stone Lake State Park is nearby.
- "2010 Census Redistricting Data (Public Law 94-171) Summary File". American FactFinder. U.S. Census Bureau, 2010 Census. Retrieved 23 April 2011.
- "Find a County". National Association of Counties. Retrieved 2011-06-07.