Jefferson County's 2026 population is estimated at 110,285, reflecting a -1.13% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Jefferson County is the 26th largest county in New York. The 2010 population was 116,609 and has grown -5.42% since 2010.
Overall: 33.7 years
Female: 35.9 years
Male: 31.9 years
There are 87,387 adults, (17,381 of whom are seniors) in Jefferson County.
Female: 54,679 (47.5%)
Male: 60,361 (52.5%)
The racial composition of Jefferson County includes 82.46% White, 4.8% Black or African American, and smaller percentages for other race, Asian, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 94,857 | 82.46% |
| Two or more races | 8,989 | 7.81% |
| Black or African American | 5,521 | 4.8% |
| Other race | 2,751 | 2.39% |
| Asian | 2,189 | 1.9% |
| Native American | 432 | 0.38% |
| Native Hawaiian or Pacific Islander | 301 | 0.26% |
Jefferson County 's average per capita income is $46,558. Household income levels show a median of $66,301. The poverty rate stands at 13.68%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $94,385 | $111,053 |
| Families | $81,387 | $100,326 |
| Households | $66,301 | $86,210 |
| Non Families | $42,340 | $55,794 |
Average Income
Median Household Income
Poverty Rate
