| Name | Union County |
| State | Arkansas |
| FIPS Code | 05139 |
| County Seat | El Dorado |
| Timezone | Central Daylight Time (CDT) |
| Population (2024) | 37,409 |
| Population Growth Rate(2020-2024) | -4.41% |
| Majority Ethnicity | White 62.06% |
| Public School Majority Ethnicity | White 49% |
| Partisan Voting Index | Republican:+16 |
| Unemployment Rate (May 2026) | 5.4% |
| Sales Tax Rate (2025) | 8.5% |
| Area Code(s) | 327 / 870 |
| Race/Ethnicity | Percentage of Population (2023) |
|---|---|
| White | 62.06% |
| African American | 32.43% |
| Hispanic | 4.57% |
| Asian | 0.83% |
| Native American | 0.11% |
| Hawaiin/Pacific Islander | 0% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 49.46% |
| African American | 38.82% |
| Hispanic | 6.81% |
| Asian | 0.81% |
| Native American | 0.26% |
| Hawaiin/Pacific Islander | 0.08% |