Seneca County's 2026 population is estimated at 33,118, reflecting a 0.71% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Seneca County is the 57th largest county in New York. The 2010 population was 35,271 and has grown -6.1% since 2010.
Data after 2023 is projected based on recent change
Overall: 43 years
Female: 45 years
Male: 41.3 years
There are 26,238 adults, (7,104 of whom are seniors) in Seneca County.
Female: 15,918 (48.4%)
Male: 17,002 (51.6%)
The racial composition of Seneca County includes 88.41% White, 3.75% Black or African American, and smaller percentages for other race, Asian, Native American and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 29,103 | 88.41% |
| Two or more races | 1,824 | 5.54% |
| Black or African American | 1,234 | 3.75% |
| Other race | 522 | 1.59% |
| Asian | 201 | 0.61% |
| Native American | 36 | 0.11% |
Seneca County 's average per capita income is $48,280. Household income levels show a median of $68,089. The poverty rate stands at 13.47%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $103,007 | - |
| Families | $91,794 | $118,167 |
| Households | $68,089 | $89,874 |
| Non Families | $41,100 | $50,504 |
Average Income
Median Household Income
Poverty Rate
