Mantorville is a city in Dodge County, Minnesota, United States. The population was 1,197 at the 2010 census. It is the county seat of Dodge County. Founded in 1854, the city is one of the oldest in Minnesota. Mantorville shares a school system with nearby Kasson, Minnesota. The K–M school system is a member of the Zumbro Education school district. Minnesota State Highway 57 serves as a main route in the city.