Clark County, South Dakota Demographics 2026

Population Overview

Clark County is located in South Dakota with a total population of 3,876. It is the 41st most populous county out of 66 in South Dakota. The county encompasses 8 Census-designated places.

Age Demographics

The median age in Clark County is 40.6 years. This is 8% higher than the state median of 37.7 years. With 29.1% 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 $62,885. This is 13% lower than the state median of $72,421. Compared to the national median of $78,538, household income here is 20% lower. The poverty rate stands at 11.1%. This is 7% lower than the state poverty rate of 12.0%. The unemployment rate is 4.0%. This is 34% higher than the state rate of 3.0%. The median home value is $141,900. Housing costs are 40% lower than the state median of $236,800. With a home-value-to-income ratio of just 2.3x, Clark County is one of the most affordable housing markets in the area. 82.3% of occupied housing units are owner-occupied. This homeownership rate is 20% higher than the state average of 68.6%.

Race & Ethnicity

Clark County has a predominantly White (non-Hispanic) population, comprising 91.8% of all residents. Hispanic or Latino residents account for 4.6%. The Black or African American population (0.5%) is well below the state average of 2.2%.

Education

16.2% of residents aged 25 and older hold a bachelor's degree or higher. This is among the lowest rates in the state, which may correlate with employment and income patterns. This is 48% lower than the state rate of 31.1%. Nationally, 35.0% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 90.0%.