Clark County, South Dakota
Located in South Dakota, Clark County has a population of 3,917 residents and a median age of 40.3 years, making it the #2,970 most populous county out of 3,222 nationwide. In terms of economic indicators, the county has a poverty rate of 10.9%. The median home value is $158,400, and the median household income is $70,726, which is 6% below the national median.
Demographics
Clark County has a population of 3,917, making it the #2,970 most populous county in the US. The median age is 40.3 years, which is 3.6% above the national median.
Population Trend
Rankings →Year-over-Year Population Growth
Age & Sex Distribution
Race & Ethnicity
Nativity
Geographic Mobility (Past Year)
Economy
The median household income in Clark County is $70,726, ranking #1,145 out of 3,222 counties — 5.9% below the national median. The poverty rate is 10.9% and unemployment stands at 4.0%.
Median Household Income Trend
Rankings →Income Distribution
Industry of Employment
Occupation
Housing
The median home value in Clark County is $158,400 (-43.8% vs national). Renters pay a median of $782/mo and the homeownership rate is 77.5%.
Median Home Value Trend
Rankings →Household Type
Education
In Clark County, 19.7% of adults age 25+ hold a bachelor's degree or higher, which is 41.5% below the national average, ranking #2,046 out of 3,222 counties.
Bachelor's Degree or Higher Trend
Rankings →Health & Wellbeing
Life expectancy in Clark County is 81.0 years. 14.3% of adults report poor or fair health and 9.4% lack health insurance. Data from County Health Rankings (2025).
Life Expectancy Trend
Substance Use
16.6% of adults in Clark County smoke , 38.0% are obese , and 22.4% report excessive drinking.
Adult Smoking Trend
Safety
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Families & Children
13.7% of children in Clark County live in poverty . The teen birth rate is 16.2 per 1,000 females age 15–19.
Teen Birth Rate Trend
Civic & Transportation
Voter turnout in Clark County is 70.3%. The mean commute time is 22.4 min, which is 18.7% below the national average.
Voter Turnout Trend
Mean Commute Time Trend
Rankings →Elections
In the 2024 presidential election, Clark County voted Republican with a margin of 52.5%. The vote was 22.5% Dem / 75% Rep. Compared to 2020, the margin shifted 1.9 toward Republicans .
Vote Share Over Time
About Clark County, South Dakota
Clark County, South Dakota has a total population of 3,917, making it the 2,970th most populous county in the United States. The median age in Clark County is 40.3 years, which is 3.6% above the national median of 38.9 years.
The median household income in Clark County is $70,726, which ranks #1,145 of 3,222 counties nationwide. This is 5.9% below the national median of $75,149. The poverty rate is 10.9%, lower than the national rate of 12.6%. The unemployment rate stands at 4.0%.
The median home value in Clark County is $158,400, 43.8% below the national median. Renters in Clark County pay a median gross rent of $782 per month. The homeownership rate is 77.5%, compared to the national rate of 64.4%.
In Clark County, 19.7% of residents aged 25 and older hold a bachelor's degree or higher, 41.5% below the national average of 33.7%. Health insurance coverage stands at 93.0% of the population. The average commute time for workers is 22.4 min.
Clark County is a diverse community. The largest racial or ethnic group is White (non-Hispanic) at 90.7% of the population, followed by Hispanic or Latino (5.3%) and Two or More Races (1.9%).
All data for Clark County, South Dakota comes from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates. These figures are estimates based on survey sampling and are subject to margin of error. For the most detailed and up-to-date data, visit the Census Bureau's official data portal.