Paynesville is a city in Stearns County, Minnesota, United States, on Lake Koronis, in the central part of the state. The population was 2,388 at t…Paynesville is a city in Stearns County, Minnesota, United States, on Lake Koronis, in the central part of the state. The population was 2,388 at the 2020 census. It is part of the St. Cloud Metropolitan Statistical Area.