| Name | Union County |
| State | Ohio |
| FIPS Code | 39159 |
| County Seat | Marysville |
| Timezone | Eastern Standard Time (EST) |
| Population (2022) | 52,153 |
| Population Growth Rate(2000-2022) | 20.05% |
| Majority Ethnicity | White 92.31% |
| Public School Majority Ethnicity | White 87% |
| Partisan Voting Index | Republican:+16 |
| Unemployment Rate (January 2025) | 3.4% |
| Area Code(s) | 326 / 937 / 220 / 740 / 380 / 614 |
| Race/Ethnicity | Percentage of Population (2022) |
|---|---|
| White | 92.31% |
| African American | 2.62% |
| Hispanic | 0.15% |
| Asian | 4.93% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 86.56% |
| African American | 2.15% |
| Hispanic | 4.73% |
| Asian | 2.66% |
| Native American | 0.15% |
| Hawaiin/Pacific Islander | 0.21% |