Lake County (South Dakota)

Lake County is a county located in the U.S. state of South Dakota. As of the 2010 census, the population was 11,200. Its county seat is Madison. The county was formed in 1873.GeographyAccording to the U.S. Census Bureau, the county has a total area of, of which is land and (2.1%) is water.LakesBuffalo SloughBrandt LakeDavis SloughGilman LakeGreen LakeLake BadusLake HermanLake MadisonLong LakeMud LakePelican LakeRound LakeMajor highways20px U.S. Highway 8120px South Dakota Highway 1920px South Dakota Highway 34