| Name | Union County |
| State | South Dakota |
| FIPS Code | 46127 |
| County Seat | Elk Point |
| Timezone | Central Daylight Time (CDT) |
| Population (2024) | 17,186 |
| Population Growth Rate(2020-2024) | 2.16% |
| Majority Ethnicity | White 91.97% |
| Public School Majority Ethnicity | White 83% |
| Partisan Voting Index | Republican:+20 |
| Unemployment Rate (May 2026) | 2.8% |
| Sales Tax Rate (2025) | 4.2% |
| Area Code(s) | 605 |
| Race/Ethnicity | Percentage of Population (2023) |
|---|---|
| White | 91.97% |
| African American | 0.85% |
| Hispanic | 4.5% |
| Asian | 1.43% |
| Native American | 1.17% |
| Hawaiin/Pacific Islander | 0.07% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 82.61% |
| African American | 1.24% |
| Hispanic | 7.58% |
| Asian | 1.52% |
| Native American | 1.44% |
| Hawaiin/Pacific Islander | 0.7% |