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Clay County, South Dakota
Map
Location in the state of South Dakota
South Dakota's location in the USA
Statistics
Founded	information needed
Seat	Vermillion
Area  - Total  - Land  - Water	1,079 km² (417 mi²) 1,066 km² (412 mi²) 13 km² (5 mi²), 1.22%
Population  - (2000)  - Density	13,537 13/km²
Website: www.claycountysd.org

Clay County is a county located in the U.S. state of South Dakota. As of 2000, the population is 13,537. Its name is in honor of Henry Clay, famous American statesman, member of the United States Senate from Kentucky and United States Secretary of State in the 19th century. Its county seat is Vermillion⁶.

Contents 1 Geography 1.1 Townships 1.2 Major Highways 1.3 Adjacent Counties 2 Demographics 3 Cities and towns

According to the U.S. Census Bureau, the county has a total area of 1,079 km² (417 mi²). 1,066 km² (412 mi²) of it is land and 13 km² (5 mi²) of it (1.22%) is water.

The county is divided into twelve townships: Bethel, Fairview Garfield, Glenwood, Meckling, Norway, Pleasant Valley, Prairie Center, Riverside, Spirit Mound, Star, Vermillion.

• South Dakota Highway 19
• South Dakota Highway 46
• South Dakota Highway 50

• Turner County, South Dakota - north
• Lincoln County, South Dakota - northeast
• Union County, South Dakota - east
• Dixon County, Nebraska - southeast
• Cedar County, Nebraska - southwest
• Yankton County, South Dakota - west

Historical populations
Census	Pop.		%±
1900	9,316		–
1910	8,711		-6.5%
1920	9,654		10.8%
1930	10,088		4.5%
1940	9,592		-4.9%
1950	10,993		14.6%
1960	10,810		-1.7%
1970	12,923		19.5%
1980	13,689		5.9%
1990	13,186		-3.7%
2000	13,537		2.7%

As of the census² of 2000, there were 13,537 people, 4,878 households, and 2,721 families residing in the county. The population density was 13/km² (33/mi²). There were 5,438 housing units at an average density of 5/km² (13/mi²). The racial makeup of the county was 92.78% White, 1.00% Black or African American, 2.66% Native American, 1.95% Asian, 0.01% Pacific Islander, 0.29% from other races, and 1.31% from two or more races. 0.89% of the population were Hispanic or Latino of any race.

There were 4,878 households out of which 28.00% had children under the age of 18 living with them, 45.00% were married couples living together, 8.10% had a female householder with no husband present, and 44.20% were non-families. 31.00% of all households were made up of individuals and 8.00% had someone living alone who was 65 years of age or older. The average household size was 2.32 and the average family size was 2.93.

In the county, the population was spread out with 18.80% under the age of 18, 31.50% from 18 to 24, 23.80% from 25 to 44, 15.80% from 45 to 64, and 10.10% who were 65 years of age or older. The median age was 25 years. For every 100 females there were 94.30 males. For every 100 females age 18 and over, there were 92.50 males.

• Irene
• Vermillion
• Wakonda

	State of South Dakota Pierre (capital)
Regions	Badlands | Black Hills | Coteau des Prairies
Cities	Aberdeen | Brandon | Brookings | Huron | Madison | Mitchell | Pierre | Rapid City | Sioux Falls | Spearfish | Sturgis | Vermillion | Watertown | Yankton
Counties	Aurora | Beadle | Bennett | Bon Homme | Brookings | Brown | Brule | Buffalo | Butte | Campbell | Charles Mix | Clark | Clay | Codington | Corson | Custer | Davison | Day | Deuel | Dewey | Douglas | Edmunds | Fall River | Faulk | Grant | Gregory | Haakon | Hamlin | Hand | Hanson | Harding | Hughes | Hutchinson | Hyde | Jackson | Jerauld | Jones | Kingsbury | Lake | Lawrence | Lincoln | Lyman | Marshall | McCook | McPherson | Meade | Mellette | Miner | Minnehaha | Moody | Pennington | Perkins | Potter | Roberts | Sanborn | Shannon | Spink | Stanley | Sully | Todd | Tripp | Turner | Union | Walworth | Yankton | Ziebach