| Name | Seneca County |
| State | Ohio |
| FIPS Code | 39147 |
| County Seat | Tiffin |
| Timezone | Eastern Daylight Time (EDT) |
| Population (2024) | 54,628 |
| Population Growth Rate(2020-2024) | -0.82% |
| Majority Ethnicity | White 90.84% |
| Public School Majority Ethnicity | White 81% |
| Partisan Voting Index | Republican:+19 |
| Unemployment Rate (May 2026) | 4.7% |
| Sales Tax Rate (2025) | 7.25% |
| Area Code(s) | 419 / 567 |
| Race/Ethnicity | Percentage of Population (2023) |
|---|---|
| White | 90.84% |
| African American | 2.71% |
| Hispanic | 5.55% |
| Asian | 0.55% |
| Native American | 0.33% |
| Hawaiin/Pacific Islander | 0.02% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 80.73% |
| African American | 1.96% |
| Hispanic | 10.29% |
| Asian | 0.39% |
| Native American | 0.06% |
| Hawaiin/Pacific Islander | 0.17% |