Seneca County's 2026 population is estimated at 54,934, reflecting a 0.19% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Seneca County is the 47th largest county in Ohio. The 2010 population was 56,619 and has grown -2.98% since 2010.
Data after 2023 is projected based on recent change
Overall: 40.2 years
Female: 41.4 years
Male: 38.8 years
There are 43,042 adults, (10,538 of whom are seniors) in Seneca County.
Female: 27,286 (49.8%)
Male: 27,484 (50.2%)
The racial composition of Seneca County includes 89.58% White, and smaller percentages for Black or African American, other race, Asian, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 49,062 | 89.58% |
| Two or more races | 2,771 | 5.06% |
| Black or African American | 1,358 | 2.48% |
| Other race | 1,159 | 2.12% |
| Asian | 301 | 0.55% |
| Native American | 107 | 0.2% |
| Native Hawaiian or Pacific Islander | 12 | 0.02% |
Seneca County 's average per capita income is $45,760. Household income levels show a median of $66,025. The poverty rate stands at 11.92%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $97,949 | $112,001 |
| Families | $80,501 | $97,225 |
| Households | $66,025 | $82,475 |
| Non Families | $36,547 | $51,394 |
Average Income
Median Household Income
Poverty Rate
