Sully County, South Dakota
Located in South Dakota, Sully County has a population of 1,526 residents and a median age of 46.9 years, making it the #3,156 most populous county out of 3,222 nationwide. In terms of economic indicators, the county has a poverty rate of 6.3%. The median home value is $205,400, and the median household income is $72,578, which is 3% below the national median.
Demographics
Sully County has a population of 1,526, making it the #3,156 most populous county in the US. The median age is 46.9 years, which is 20.6% above the national median.
Population Trend
Rankings →Year-over-Year Population Growth
Age & Sex Distribution
Race & Ethnicity
Nativity
Geographic Mobility (Past Year)
Economy
The median household income in Sully County is $72,578, ranking #1,009 out of 3,222 counties — 3.4% below the national median. The poverty rate is 6.3% and unemployment stands at 0.0%.
Median Household Income Trend
Rankings →Income Distribution
Industry of Employment
Occupation
Housing
The median home value in Sully County is $205,400 (-27.1% vs national). Renters pay a median of $842/mo and the homeownership rate is 72.8%.
Median Home Value Trend
Rankings →Household Type
Education
In Sully County, 24.1% of adults age 25+ hold a bachelor's degree or higher, which is 28.6% below the national average, ranking #1,360 out of 3,222 counties.
Bachelor's Degree or Higher Trend
Rankings →Health & Wellbeing
13.2% of adults report poor or fair health and 6.5% lack health insurance. Data from County Health Rankings (2025).
Poor/Fair Health Trend
Substance Use
17.0% of adults in Sully County smoke , 37.4% are obese , and 24.0% report excessive drinking.
Adult Smoking Trend
Safety
.
Families & Children
7.4% of children in Sully County live in poverty .
Child Poverty Trend
Civic & Transportation
Voter turnout in Sully County is 89.9%. The mean commute time is 20.1 min, which is 27.3% below the national average.
Voter Turnout Trend
Mean Commute Time Trend
Rankings →Elections
In the 2024 presidential election, Sully County voted Republican with a margin of 60.9%. The vote was 18.6% Dem / 79.5% Rep. Compared to 2020, the margin shifted 2.7 toward Republicans .
Vote Share Over Time
About Sully County, South Dakota
Sully County, South Dakota has a total population of 1,526, making it the 3,156th most populous county in the United States. The median age in Sully County is 46.9 years, which is 20.6% above the national median of 38.9 years.
The median household income in Sully County is $72,578, which ranks #1,009 of 3,222 counties nationwide. This is 3.4% below the national median of $75,149. The poverty rate is 6.3%, lower than the national rate of 12.6%.
The median home value in Sully County is $205,400, 27.1% below the national median. Renters in Sully County pay a median gross rent of $842 per month. The homeownership rate is 72.8%, compared to the national rate of 64.4%.
In Sully County, 24.1% of residents aged 25 and older hold a bachelor's degree or higher, 28.6% below the national average of 33.7%. Health insurance coverage stands at 93.4% of the population. The average commute time for workers is 20.1 min.
Sully County is a diverse community. The largest racial or ethnic group is White (non-Hispanic) at 86.5% of the population, followed by Two or More Races (4.7%) and Black (non-Hispanic) (4.5%).
All data for Sully County, South Dakota comes from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates. These figures are estimates based on survey sampling and are subject to margin of error. For the most detailed and up-to-date data, visit the Census Bureau's official data portal.