| Name | Mercer County |
| State | Ohio |
| FIPS Code | 39107 |
| County Seat | Celina |
| Timezone | Eastern Daylight Time (EDT) |
| Population (2024) | 42,448 |
| Population Growth Rate(2020-2024) | -0.19% |
| Majority Ethnicity | White 96.43% |
| Public School Majority Ethnicity | White 92% |
| Partisan Voting Index | Strongly Republican:+34 |
| Unemployment Rate (May 2026) | 3.4% |
| Sales Tax Rate (2025) | 7.25% |
| Area Code(s) | 419 / 567 |
| Race/Ethnicity | Percentage of Population (2023) |
|---|---|
| White | 96.43% |
| African American | 0.71% |
| Hispanic | 2.21% |
| Asian | 0.51% |
| Native American | 0.06% |
| Hawaiin/Pacific Islander | 0.09% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 92.39% |
| African American | 0.65% |
| Hispanic | 2.39% |
| Asian | 0.58% |
| Native American | 0.08% |
| Hawaiin/Pacific Islander | 2.36% |