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Clay County, South Dakota

US county information
NameClay County
StateSouth Dakota
US Area
Total Area417 sq mi (1080 km2)
Land Area412 sq mi (1067.1 km2)
Water Area5 sq mi (13 km2)
Population13864 (2010)
Density13/km2 (33.7/sq mi)

     Home | County | Clay County South Dakota

Clay County is a county located in the U.S. state of South Dakota. As of the 2010 census, the population was 13,864. It's name is in honor of Henry Clay, American statesman, member of the United States Senate from Kentucky and United States Secretary of State in the 19th century.

The county seat is Vermillion, which is also home to the University of South Dakota. Clay County is the only county in the Vermillion Micropolitan Statistical Area.

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