Union County's estimated 2025 population is 17,423 with a growth rate of 0.69% in the past year according to the most recent United States census data. Union County is the 13th largest county in South Dakota. The 2010 population was 14,488 and has seen a growth of 20.26% since that time.
Data after 2023 is projected based on recent change
The racial composition of Union County includes 90.41% White, and smaller percentages for Asian, Native American, other race, Black or African American, Native Hawaiian or Pacific Islander and multiracial populations.
White
Two or more races
Asian
Native American
Other race
Black or African American
Native Hawaiian or Pacific Islander
Race | Population | Percentage (of total) |
|---|---|---|
| White | 15,293 | 90.41% |
| Two or more races | 873 | 5.16% |
| Asian | 238 | 1.41% |
| Native American | 195 | 1.15% |
| Other race | 163 | 0.96% |
| Black or African American | 142 | 0.84% |
| Native Hawaiian or Pacific Islander | 12 | 0.07% |
Married
Widowed
Divorced
Separated
Never Married
Union County's average per capita income is $54,908. Household income levels show a median of $84,137. The poverty rate stands at 7.29%.
Name | Median | Mean |
|---|---|---|
| Married Families | $116,262 | - |
| Families | $107,311 | $142,096 |
| Households | $84,137 | $116,720 |
| Non Families | $49,559 | $59,194 |
Average Income
Median Household Income
Poverty Rate