Clay County, South Dakota

related topics
{household, population, female}
{county, mile, population}
{township, household, population}
{land, century, early}

Clay County is a county located in the U.S. state of South Dakota. As of 2000, the population was 13,537. Its 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.[1]

The county seat is Vermillion, which is also home to the University of South Dakota.[2] Clay County is the only county in the Vermillion Micropolitan Statistical Area.



Clay County began forming in 1859 when the land was opened for legal occupation. In 1862 the county was formally organized. The Clay County Courthouse was built in 1912.

Clay County is the name of 17 other counties in the United States; most of them named in honor of Henry Clay.


According to the U.S. Census Bureau, the county has a total area of 417 square miles (1,080.0 km2), of which 412 square miles (1,067.1 km2) is land and 5 square miles (12.9 km2) (1.22%) is water. In area it is the smallest county in South Dakota.

National protected area

Adjacent counties

Full article ▸

related documents
Burnett County, Wisconsin
Crawford County, Pennsylvania
Greene County, Pennsylvania
Marathon County, Wisconsin
Kauai County, Hawaii
Sheboygan County, Wisconsin
Lorain County, Ohio
Lewis County, Missouri
Texas County, Missouri
Clark County, Wisconsin
Chatham County, Georgia
Richland County, Wisconsin
Douglas County, Wisconsin
Vilas County, Wisconsin
Vernon County, Wisconsin
Susquehanna County, Pennsylvania
Franklin County, Pennsylvania
Lincoln County, Wisconsin
Jefferson County, Pennsylvania
Milwaukee County, Wisconsin
Ashland County, Wisconsin
Adams County, Pennsylvania
Trempealeau County, Wisconsin
Waushara County, Wisconsin
Manitowoc County, Wisconsin
Cameron County, Pennsylvania
Outagamie County, Wisconsin
Lake of the Woods County, Minnesota
Rusk County, Wisconsin
Juniata County, Pennsylvania