Clark County, South Dakota Demographics 2026

Name: Clark County, South Dakota Demographics
Creator: U.S. Census Bureau
License: https://www.census.gov/data/developers/about/terms-of-service.html

Clark County, South Dakota has a population of 3,917, the 41st most populous county in South Dakota. The median household income is $70,726 and the median home value is $158,400. The poverty rate is 10.8%.

Data vintage: U.S. Census Bureau ACS 2020–2024 5-Year Estimates · refreshed July 2026 · Methodology & source notes

Clark County Quick Facts

Population 3,917

Median Household Income $70,726

Median Home Value $158,400

Poverty Rate 10.8%

Unemployment Rate 4.0%

Median Age 40.3 years

Homeownership Rate 77.5%

Affordability Ratio 2.2x

Bachelor's Degree+ 19.7%

High School Graduation 90.6%

Cities/Places 9

Population 3,917 41st of 66

Median Income $70,726 6% lower than state

Poverty Rate 10.8%

Unemployment 4.0%

How Clark County Changed

Change from the 2019–2023 ACS period to 2020–2024. These are rolling five-year estimates, not year-over-year measurements.

Metric	2019–2023	2020–2024	Change
Population	3,876	3,917	+1.1%
Median household income	$62,885	$70,726	+12.5%
Median home value	$141,900	$158,400	+11.6%

Median Household Income

Clark

$70,726

$75,081

National

$80,734

Median Home Value

Clark

$158,400

$257,400

National

$332,700

Economy & Housing

Household Income Distribution

Under $25K 14.0%

$25K-$50K 21.2%

$50K-$100K 32.0%

$100K+ 32.9%

Detailed income brackets

Under $10K

4.2%

$10K-$15K

3.0%

$15K-$20K

5.1%

$20K-$25K

1.7%

$25K-$30K

2.8%

$30K-$35K

6.2%

$35K-$40K

2.7%

$40K-$45K

2.9%

$45K-$50K

6.5%

$50K-$60K

7.2%

$60K-$75K

12.0%

$75K-$100K

12.7%

$100K-$125K

18.6%

$125K-$150K

4.4%

$150K-$200K

4.3%

$200K+

5.5%

Employment

4.0% Unemployment Rate State: 2.9%|National: 5.2%

59.4% Labor Force Participation

Housing Overview

Owner 77.5%

Renter 22.5%

Affordability Index Very Affordable

2.2x home value to income ratio

Median gross rent $782/mo 13.3% of median household income annually

People & Demographics

Age Distribution

Under 18

29.4%

18-34

16.1%

35-54

18.7%

55-74

25.9%

75+

10.0%

Race & Ethnicity

Diversity Index

Very Low Diversity

A less diverse community where one racial or ethnic group represents a large majority.

State average: 35 | National average: 61

Education

Educational Attainment (Adults 25+)

Cities & Places in Clark County

City	Population	Median Income	Poverty	Home Value
Clark	1,359	$58,750	10.7%	$122,800
Willow Lake	433	$72,875	1.1%	$149,000
Naples	96	N/A	53.1%	$106,300
Raymond	82	$75,000	11.0%	$42,800
Bradley	78	$57,500	11.5%	$94,200
Garden City	78	$93,750	4.0%	N/A
Mayfield Colony	77	N/A	69.6%	N/A
Vienna	49	$43,125	0.0%	N/A
Crocker	22	N/A	0.0%	N/A

Explore South Dakota Rankings

Cities by Population All cities ranked by size Richest Cities Ranked by median income Most Educated By bachelor's degree rate Most Affordable By housing affordability

Population Overview

Clark County is located in South Dakota with a total population of 3,917. It is the 41st most populous county out of 66 in South Dakota. The county encompasses 9 Census-designated places.

Age Demographics

The median age in Clark County is 40.3 years. This is 6% higher than the state median of 38.0 years. With 29.4% of the population under 18, Clark County has a notably young demographic profile, suggesting a family-oriented community.

Economy, Income & Housing

The median household income in Clark County is $70,726. This is 6% lower than the state median of $75,081. It is also 12% lower than the national median of $80,734. The poverty rate stands at 10.8%. This is 9% lower than the state poverty rate of 11.9%. The unemployment rate is 4.0%. This is 35% higher than the state rate of 2.9%. The median home value is $158,400. Housing costs are 38% lower than the state median of $257,400. With a home-value-to-income ratio of just 2.2x, Clark County is one of the most affordable housing markets in the area. 77.5% of occupied housing units are owner-occupied. This homeownership rate is 13% higher than the state average of 68.6%.

Race & Ethnicity

Clark County has a predominantly White (non-Hispanic) population, comprising 90.7% of all residents. Hispanic or Latino residents account for 5.3%. The Black or African American population (0.5%) is well below the state average of 2.1%. The Asian population (0.7%) is well below the state average of 1.4%.

Education

19.7% of residents aged 25 and older hold a bachelor's degree or higher. This is 38% lower than the state rate of 31.9%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 90.6%.

Data Sources & Methodology

All figures for Clark County come from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates, with comparisons drawn against South Dakota and national averages from the same dataset. See our methodology page for how each metric is defined, or data.census.gov for official tables with margins of error.

Frequently Asked Questions

What is the population of Clark County, South Dakota?

Clark County has a population of 3,917, making it the 41st most populous county in South Dakota.

What is the median income in Clark County?

The median household income in Clark County is $70,726 with a poverty rate of 10.8%.

How many cities are in Clark County, South Dakota?

Clark County contains 9 Census-designated places.