Jefferson County's 2026 population is estimated at 814,881, reflecting a 1.31% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Jefferson County is the largest county in Kentucky. The 2010 population was 742,096 and has grown 9.81% since 2010.
Data after 2023 is projected based on recent change
Overall: 38.4 years
Female: 39.7 years
Male: 37.2 years
There are 608,746 adults, (134,317 of whom are seniors) in Jefferson County.
Female: 402,067 (51.3%)
Male: 380,955 (48.7%)
The racial composition of Jefferson County includes 63.15% White, 20.76% Black or African American, 3.15% Asian, and smaller percentages for other race, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 494,460 | 63.15% |
| Black or African American | 162,586 | 20.76% |
| Two or more races | 80,001 | 10.22% |
| Asian | 24,685 | 3.15% |
| Other race | 19,785 | 2.53% |
| Native American | 1,196 | 0.15% |
| Native Hawaiian or Pacific Islander | 309 | 0.04% |
Jefferson County 's average per capita income is $49,243. Household income levels show a median of $69,866. The poverty rate stands at 14.29%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $114,881 | $147,165 |
| Families | $90,606 | $120,643 |
| Households | $69,866 | $97,866 |
| Non Families | $45,551 | $62,625 |
Average Income
Median Household Income
Poverty Rate