| Name | Preble County |
| State | Ohio |
| FIPS Code | 39135 |
| County Seat | Eaton |
| Timezone | Eastern Daylight Time (EDT) |
| Population (2024) | 40,563 |
| Population Growth Rate(2020-2024) | -1.09% |
| Majority Ethnicity | White 97.84% |
| Public School Majority Ethnicity | White 94% |
| Partisan Voting Index | Strongly Republican:+30 |
| Unemployment Rate (May 2026) | 4.2% |
| Area Code(s) | 326 / 937 / 283 / 513 |
| Race/Ethnicity | Percentage of Population (2023) |
|---|---|
| White | 97.84% |
| African American | 0.8% |
| Hispanic | 1.1% |
| Asian | 0.2% |
| Native American | 0.04% |
| Hawaiin/Pacific Islander | 0.01% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 94.48% |
| African American | 0.56% |
| Hispanic | 1.68% |
| Asian | 0.41% |
| Native American | 0.05% |
| Hawaiin/Pacific Islander | 0.12% |