Jefferson County's 2026 population is estimated at 43,170, reflecting a -0.2% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Jefferson County is the 48th largest county in Pennsylvania. The 2010 population was 45,163 and has grown -4.41% since 2010.
Overall: 44 years
Female: 44.8 years
Male: 43.1 years
There are 34,499 adults, (9,757 of whom are seniors) in Jefferson County.
Female: 21,830 (49.8%)
Male: 22,034 (50.2%)
The racial composition of Jefferson County includes 95.88% White, and smaller percentages for other race, Black or African American, Asian, Native American and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 42,057 | 95.88% |
| Two or more races | 1,316 | 3% |
| Other race | 187 | 0.43% |
| Black or African American | 157 | 0.36% |
| Asian | 121 | 0.28% |
| Native American | 26 | 0.06% |
Jefferson County 's average per capita income is $42,136. Household income levels show a median of $58,686. The poverty rate stands at 14.15%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $84,063 | - |
| Families | $73,596 | $91,546 |
| Households | $58,686 | $76,614 |
| Non Families | $34,899 | $46,752 |
Average Income
Median Household Income
Poverty Rate