Clark County, South Dakota Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 41st-largest in South Dakota
The population of Clark County, South Dakota is 3,876 as of the 2023 American Community Survey, making it the 41st-largest county in South Dakota. The median household income is $62,885, the median home value is $141,900, and the median age is 40.6.
The population of Clark County has grown 7.5% since 2010 (3,698 → 3,974), a +0.52% annualized rate.
3,876
Population
+0.52%
Annual growth
4
People / sq mi
$62,885
Median Income
$141,900
Median Home Value
Clark County covers 958 sq mi of land at 4.0 people per square mile.
About Clark County, SD
Clark County is a county in South Dakota with a population of 3,876. It ranks #41 among counties in South Dakota by population. The median age is 40.6, older than the national median. The population is 51.0% male and 49.0% female.
The median household income in Clark County is $62,885, below the US median of $74,580. 6.4% of residents live below the federal poverty level. Home values sit at a median of $141,900, with monthly rent averaging $709. The homeownership rate of 82.3% is higher than the national rate of 64.8%.
Educational attainment in Clark County reflects 16.2% of adults 25 and older holding a bachelor's degree or higher, below the national average of 34.3%. Roughly 17.1% of workers primarily work from home, similar to the national work-from-home rate of 14.2%. The average commute is 19.6 minutes each way.
Clark County Population History (2010-2024)
The county of Clark County had a population of 3,698 in 2010 and 3,974 in 2024, a 7.5% growth over 14 years. The peak was 3,974 in 2024. Average annual growth rate: 0.52%.
3,974
Population (2024)
3,698
Population (2010)
3,974
Peak (2024)
0.52%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 3,698 |
| 2011 | 3,597 |
| 2012 | 3,596 |
| 2013 | 3,627 |
| 2014 | 3,651 |
| 2015 | 3,652 |
| 2016 | 3,634 |
| 2017 | 3,677 |
| 2018 | 3,721 |
| 2019 | 3,740 |
| 2020 | 3,851 |
| 2021 | 3,871 |
| 2022 | 3,945 |
| 2023 | 3,945 |
| 2024 | 3,974 |
Race & Ethnicity
| White | 91.8% |
| Black or African American | 0.5% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 2.1% |
| Two or More Races | 0.0% |
Age & Sex
40.6
Median Age
49.0%
Female
51.0%
Male
23.3%
Age 65+
Age Distribution
Children (under 15): 25.1% · Seniors (65+): 23.3%
Income & Poverty
| Median household income | $62,885$-9,536 vs state |
| Mean household income | $88,749 |
| Per-capita income | $34,133 |
| Poverty rate | 6.4%-1.0% vs state |
| Unemployment rate | 2.3% |
| Employment-to-population | 55.7% |
Top Industries by Employment
The largest employment sector in Clark County is agriculture, accounting for 29.8% of workers.
How residents commute
0.0%
Drive alone
4.8%
Carpool
68.7%
Public transit
17.1%
Work from home
19.6 min
Avg commute
Housing
$141,900$-94,900 vs state
Median home value
$709
Median rent
82.3%
Homeownership rate
1,609
Total housing units
82.2%
Occupied
17.8%
Vacant
17.7%
Renter-occupied
Social & access
93.1%
With health insurance
90.8%
With broadband internet
17.1%
Foreign-born
8.4%
Veterans (18+)
10.9%
With a disability
92.6%
Speak language other than English at home
Education
90.0%
High School+
16.2%
Bachelor's+
Largest cities in South Dakota
Other counties in South Dakota
Part of South Dakota
Metro areas in South Dakota
County rankings
Frequently Asked Questions
Clark County, South Dakota has a population of 3,876 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 41st-largest county in South Dakota. Population density is 4 people per square mile.
The population of Clark County has grown 7.5% since 2010 (3,698 → 3,974), a +0.52% annualized rate.
The median household income in Clark County, South Dakota is $62,885, with mean (average) household income of $88,749 and per-capita income of $34,133. 6.4% of residents live below the federal poverty level.
In Clark County, the largest racial and ethnic groups are White (91.8%), Hispanic or Latino (2.1%), Black or African American (0.5%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Clark County, South Dakota is 40.6 years. Residents are 49.0% female and 51.0% male.
The median home value in Clark County is $141,900 and median monthly rent is $709. 82.3% of occupied housing units are owner-occupied. The county has 1,609 total housing units, 17.8% of which are vacant.
The largest employment sector in Clark County, South Dakota is agriculture, forestry, fishing, and mining, employing 29.8% of workers. The unemployment rate is 2.3%.
Sioux Falls is among the largest cities associated with Clark County, South Dakota, with a population of 197,642.
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Full rankings of South Dakota counties
Statewide data for South Dakota
Population, race, income, age, and trends across South Dakota
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.