Clay County is a county in the U.S. state of South Dakota. As of the 2020 census, the population was 14,967, and was estimated to be 15,245 in 2024. The county seat is Vermillion, which is also home to the University of South Dakota. The county is named for Henry Clay, American statesman, US Senator from Kentucky, and United States Secretary of State in the 19th century. Clay County comprises the Vermillion, SD Micropolitan Statistical Area, which is also included in the Sioux City-Vermillion, Iowa-SD-Nebraska Combined Statistical Area. Collected from Wikipedia.
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Areas Located Within , 
Charts for Clay County, SD
   Population Estimate, Total, Not Hispanic or Latino, Some Other Race Alone (5-year estimate) in Clay County, SD2024-01-01
   Population Estimate, Total, Hispanic or Latino, Black or African American Alone (5-year estimate) in Clay County, SD2024-01-01
   Homeownership Rate (5-year estimate) for Clay County, SD2024-01-01
   Premature Death Rate for Clay County, SD2020-01-01
   Age-Adjusted Premature Death Rate for Clay County, SD2020-01-01
   Equifax Subprime Credit Population for Clay County, SD2025-10-01
   High School Graduate or Higher (5-year estimate) in Clay County, SD2024-01-01
   Bachelor's Degree or Higher (5-year estimate) in Clay County, SD2024-01-01
   Net County-to-County Migration Flow (5-year estimate) for Clay County, SD (DISCONTINUED)2020-01-01
   SNAP Benefits Recipients in Clay County, SD2023-01-01
   90% Confidence Interval Upper Bound of Estimate of Percent of People Age 0-17 in Poverty for Clay County, SD2024-01-01
   90% Confidence Interval Upper Bound of Estimate of Median Household Income for Clay County, SD2024-01-01
   Poverty Universe, All Ages for Clay County, SD2024-01-01
   Burdened Households (5-year estimate) in Clay County, SD2024-01-01
   90% Confidence Interval Upper Bound of Estimate of Percent of People of All Ages in Poverty for Clay County, SD2024-01-01
   Estimate of People of All Ages in Poverty in Clay County, SD2024-01-01
   Income Inequality in Clay County, SD2024-01-01
   Estimate, Median Age by Sex, Total Population (5-year estimate) in Clay County, SD2024-01-01
   All-Transactions House Price Index for Clay County, SD2025-01-01
   Population Estimate, Total, Hispanic or Latino (5-year estimate) in Clay County, SD2024-01-01
   Combined Violent and Property Crime Offenses Known to Law Enforcement in Clay County, SD (DISCONTINUED)2021-01-01
   New Private Housing Structures Authorized by Building Permits for Clay County, SD2025-01-01
   Estimate of Median Household Income for Clay County, SD2024-01-01
   Percent of Population Below the Poverty Level (5-year estimate) in Clay County, SD2024-01-01
   Population Estimate, Total, Not Hispanic or Latino, Two or More Races (5-year estimate) in Clay County, SD2024-01-01
   Population Estimate, Total, Not Hispanic or Latino, Native Hawaiian and Other Pacific Islander Alone (5-year estimate) in Clay County, SD2024-01-01
   Estimated Percent of People of All Ages in Poverty for Clay County, SD2024-01-01
   Single-Parent Households with Children as a Percentage of Households with Children (5-year estimate) in Clay County, SD2024-01-01
   Population Estimate, Total, Not Hispanic or Latino, White Alone (5-year estimate) in Clay County, SD2024-01-01
   Gross Domestic Product: Private Goods-Producing Industries in Clay County, SD2024-01-01
   Population Estimate, Total, Hispanic or Latino, Some Other Race Alone (5-year estimate) in Clay County, SD2024-01-01
   Population Estimate, Total, Hispanic or Latino, American Indian and Alaska Native Alone (5-year estimate) in Clay County, SD2024-01-01
   Population Estimate, Total, Hispanic or Latino, Two or More Races, Two Races Including Some Other Race (5-year estimate) in Clay County, SD2024-01-01
   Estimate of Related Children Age 5-17 in Families in Poverty for Clay County, SD2024-01-01
   Resident Population in Clay County, SD2025-01-01
   Poverty Universe, Age 5-17 related for Clay County, SD2024-01-01
   Rate of Preventable Hospital Admissions (5-year estimate) in Clay County, SD (DISCONTINUED)2015-01-01
   Estimated Percent of People Age 0-17 in Poverty for Clay County, SD2024-01-01
   New Patent Assignments in Clay County, SD2006-09-01
   90% Confidence Interval Upper Bound of Estimate of Percent of Related Children Age 5-17 in Families in Poverty for Clay County, SD2024-01-01
News and research for Clay County, SD
US Bureau of Labor Statistics (60) US Congressional Budget Office (16) US Census Bureau (14) Board of Governors of the Federal Reserve System (3) Federal Reserve Bank of New York (17) Federal Reserve Bank of Philadelphia (8) US Employment and Training Administration (11) The World Bank (71)
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