Union County's estimated 2026 population is 17,834 with a growth rate of 1.23% in the past year according to the most recent United States census data. Union County is the 12th largest county in South Dakota. The 2010 population was 14,488 and has seen a growth of 23.09% 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 (90.41%)
Two or more races (5.16%)
Asian (1.41%)
Native American (1.15%)
Other race (0.96%)
Black or African American (0.84%)
Native Hawaiian or Pacific Islander (0.07%)
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