Lake County is a county in the U.S. state of South Dakota. As of the 2020 census, the population was 11,059. Its county seat is Madison. The county was formed in 1873. Lake County, South Dakota, was inhabited by the Sisseton Sioux when explorers, including Joseph Nicollet and John C. Fremont, first mapped the region in 1838–39 and noted its numerou…Lake County is a county in the U.S. state of South Dakota. As of the 2020 census, the population was 11,059. Its county seat is Madison. The county was formed in 1873. Lake County, South Dakota, was inhabited by the Sisseton Sioux when explorers, including Joseph Nicollet and John C. Fremont, first mapped the region in 1838–39 and noted its numerous lakes. The 1851 Treaty of Mendota with the Santee Sioux and 1858 Yankton Treaty opened the area for American settlement. The 1857 rescue of Mrs. Marble from among the captives of the Spirit Lake Massacre brought early non-Sioux attention to the area.
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