Lake County | |
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![]() Lake County Court House | |
![]() Location within the U.S. state of South Dakota | |
![]() South Dakota's location within the U.S. | |
Coordinates: 44°01′N 97°07′W / 44.02°N 97.12°W | |
Country | ![]() |
State | ![]() |
Founded | 1873 |
Seat | Madison |
Largest city | Madison |
Area | |
• Total | 575 sq mi (1,490 km2) |
• Land | 563 sq mi (1,460 km2) |
• Water | 12 sq mi (30 km2) 2.1% |
Population (2020) | |
• Total | 11,059 |
• Estimate (2023) | 11,031 ![]() |
• Density | 19/sq mi (7.4/km2) |
Time zone | UTC−6 (Central) |
• Summer (DST) | UTC−5 (CDT) |
Congressional district | At-large |
Website | www |
Lake County is a county in the U.S. state of South Dakota. As of the 2020 census, the population was 11,059.[1] Its county seat is Madison.[2] The county was formed in 1873.[3]