Sully County, South Dakota Demographics 2026

Population Overview

Sully County is located in South Dakota with a total population of 1,481. It is the 62nd most populous county out of 66 in South Dakota. The county encompasses 2 Census-designated places.

Age Demographics

The median age in Sully County is 51.4 years. This is 36% higher than the state median of 37.7 years.

Economy, Income & Housing

The median household income in Sully County is $70,250. This is 3% lower than the state median of $72,421. Compared to the national median of $78,538, household income here is 11% lower. The poverty rate stands at 7.9%. This is 34% lower than the state poverty rate of 12.0%. The unemployment rate is 0.0%. This is 100% lower than the state rate of 3.0%. The median home value is $198,700. Housing costs are 16% lower than the state median of $236,800. With a home-value-to-income ratio of just 2.8x, Sully County is one of the most affordable housing markets in the area. 76.1% of occupied housing units are owner-occupied. This homeownership rate is 11% higher than the state average of 68.6%.

Race & Ethnicity

Sully County has a predominantly White (non-Hispanic) population, comprising 92.5% of all residents. Black or African American residents account for 5.0%. The Black or African American population is significantly higher than the state average (5.0% vs 2.2%).

Education

20.9% of residents aged 25 and older hold a bachelor's degree or higher. This is 33% 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 96.2%.