Marshall County, South Dakota Demographics 2026

Population Overview

Marshall County is located in South Dakota with a total population of 4,355. It is the 37th most populous county out of 66 in South Dakota. The county encompasses 5 Census-designated places.

Age Demographics

The median age in Marshall County is 42.8 years. This is 14% higher than the state median of 37.7 years.

Economy, Income & Housing

The median household income in Marshall County is $72,500. This is about average than the state median of $72,421. Compared to the national median of $78,538, household income here is 8% lower. The poverty rate stands at 7.9%. This is 35% lower than the state poverty rate of 12.0%. The unemployment rate is 1.1%. This is 64% lower than the state rate of 3.0%. The median home value is $147,200. Housing costs are 38% lower than the state median of $236,800. With a home-value-to-income ratio of just 2.0x, Marshall County is one of the most affordable housing markets in the area. 80.1% of occupied housing units are owner-occupied. This homeownership rate is 17% higher than the state average of 68.6%.

Race & Ethnicity

The largest racial or ethnic group in Marshall County is White (non-Hispanic), making up 84.3% of the population. Hispanic or Latino residents account for 6.1%. The Black or African American population (0.1%) is well below the state average of 2.2%.

Education

22.4% of residents aged 25 and older hold a bachelor's degree or higher. This is 28% 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 92.1%.