Lake Koshkonong is a census-designated place (CDP) in the towns of Koshkonong and Sumner, Jefferson County, Wisconsin, United States. The population was 1,239 at the 2020 census. Lake Koshkonong is in the area.
Geography
Lake Koshkonong is located at (42.860475, -88.940344).
According to the United States Census Bureau, the CDP has a total area of 29.9 square miles (77.4 km<sup>2</sup>), of which 14.3 square miles (37.1 km<sup>2</sup>) is land and 15.6 square miles (40.3 km<sup>2</sup>) (52.11%) is water.
Demographics
As of the census