Jefferson County, Kentucky Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 1st-largest in Kentucky
The population of Jefferson County, Kentucky is 777,392 as of the 2023 American Community Survey, making it the 1st-largest county in Kentucky. The median household income is $67,849, the median home value is $237,200, and the median age is 38.4.
The population of Jefferson County has grown 7.0% since 2010 (742,096 → 793,881), a +0.48% annualized rate.
777,392
Population
+0.48%
Annual growth
2041
People / sq mi
$67,849
Median Income
$237,200
Median Home Value
Jefferson County covers 381 sq mi of land at 2041.3 people per square mile.
About Jefferson County, KY
Jefferson County is a county in Kentucky with a population of 777,392. It ranks #1 among counties in Kentucky by population. The median age is 38.4, in line with the national median. The population is 48.6% male and 51.4% female.
The median household income in Jefferson County is $67,849, below the US median of $74,580. 10.6% of residents live below the federal poverty level. Home values sit at a median of $237,200, with monthly rent averaging $1,097. The homeownership rate of 61.8% is lower than the national rate of 64.8%.
Educational attainment in Jefferson County reflects 36.6% of adults 25 and older holding a bachelor's degree or higher, above the national average of 34.3%. Roughly 12.4% of workers primarily work from home, similar to the national work-from-home rate of 14.2%. The average commute is 22.3 minutes each way.
Jefferson County Population History (2010-2024)
The county of Jefferson County had a population of 742,096 in 2010 and 793,881 in 2024, a 7.0% growth over 14 years. The peak was 793,881 in 2024. Average annual growth rate: 0.49%.
793,881
Population (2024)
742,096
Population (2010)
793,881
Peak (2024)
0.49%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 742,096 |
| 2011 | 746,458 |
| 2012 | 751,802 |
| 2013 | 759,427 |
| 2014 | 762,038 |
| 2015 | 765,322 |
| 2016 | 767,770 |
| 2017 | 770,383 |
| 2018 | 768,706 |
| 2019 | 767,785 |
| 2020 | 782,896 |
| 2021 | 777,624 |
| 2022 | 777,329 |
| 2023 | 783,381 |
| 2024 | 793,881 |
Race & Ethnicity
| White | 65.3% |
| Black or African American | 22.0% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 1.2% |
| Two or More Races | 0.0% |
Age & Sex
38.4
Median Age
51.4%
Female
48.6%
Male
16.8%
Age 65+
Age Distribution
Children (under 15): 18.5% · Seniors (65+): 16.8%
Income & Poverty
| Median household income | $67,849+$5,432 vs state |
| Mean household income | $95,889 |
| Per-capita income | $41,267 |
| Poverty rate | 10.6%-1.2% vs state |
| Unemployment rate | 3.1% |
| Employment-to-population | 62.3% |
Top Industries by Employment
The largest employment sector in Jefferson County is professional & business services, accounting for 23.5% of workers.
How residents commute
1.9%
Drive alone
1.9%
Carpool
73.7%
Public transit
12.4%
Work from home
22.3 min
Avg commute
Housing
$237,200+$44,900 vs state
Median home value
$1,097
Median rent
61.8%
Homeownership rate
357,923
Total housing units
92.0%
Occupied
8.0%
Vacant
38.2%
Renter-occupied
Social & access
94.4%
With health insurance
94.4%
With broadband internet
24.2%
Foreign-born
6.4%
Veterans (18+)
14.3%
With a disability
88.0%
Speak language other than English at home
Education
91.5%
High School+
36.6%
Bachelor's+
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County rankings
Common questions about Jefferson County, KY
Frequently Asked Questions
Jefferson County, Kentucky has a population of 777,392 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 1st-largest county in Kentucky. Population density is 2041 people per square mile.
The population of Jefferson County has grown 7.0% since 2010 (742,096 → 793,881), a +0.48% annualized rate.
The median household income in Jefferson County, Kentucky is $67,849, with mean (average) household income of $95,889 and per-capita income of $41,267. 10.6% of residents live below the federal poverty level.
In Jefferson County, the largest racial and ethnic groups are White (65.3%), Black or African American (22.0%), Hispanic or Latino (1.2%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Jefferson County, Kentucky is 38.4 years. Residents are 51.4% female and 48.6% male.
The median home value in Jefferson County is $237,200 and median monthly rent is $1,097. 61.8% of occupied housing units are owner-occupied. The county has 357,923 total housing units, 8.0% of which are vacant.
The largest employment sector in Jefferson County, Kentucky is professional, scientific, and management services, employing 23.5% of workers. The unemployment rate is 3.1%.
Louisville/Jefferson County is among the largest cities associated with Jefferson County, Kentucky, with a population of 627,210.
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.