File:Jefferson_County_KY_Courthouse_2.jpg · Wikimedia Commons · See Wikimedia Commons
Jefferson County
Sign in to saveAlso known as Jefferson County, Kentucky, Jefferson County, KY
county in Kentucky, United States
Key facts
- Country
- United States
- State
- Kentucky
- Named after
- Thomas Jefferson
- Seat
- Louisville
- Largest city
- Louisville
- Judge executive
- Quennie Averette (D)
- Total
- 398 sq mi (1,030 km )
- Land
- 380 sq mi (980 km )
- Water
- 17 sq mi (44 km ) 4.3%
- Estimate 2025
- 795,222
- Density
- 2,100/sq mi (800/km )
- Time zone
- UTC−5 ( Eastern )
- Summer dst
- UTC−4 ( EDT )
- Congressional districts
- 2nd , 3rd
- Website
- louisvilleky .gov
via Wikipedia infobox
Wikidata facts
- Population
- 782969
- Area
- 1032
- Official website
- www.louisvilleky.gov
- Image
- Jefferson County KY Courthouse 2.jpg
- Households
- 316411
Show 6 more facts
- P12749
- sphinx
- Commons category
- Jefferson County, Kentucky
- inception
- 1780-05-01
- water as percent of area
- 4.3
- native label
- Jefferson County
- per capita income
- 34365
Sources (9)
via Wikidata · CC0
~10 min read
Article
Jefferson County is a county located in the north central portion of the U.S. state of Kentucky. As of the 2020 census, the population was 782,969. It is the most populous county in the commonwealth (with more than twice the population of second ranked Fayette County).
Since a city-county merger in 2003, the county's territory, population and government have been coextensive with the city of Louisville, which also serves as county seat. The administrative entity created by this merger is the Louisville/Jefferson County Metro Government, abbreviated to Louisville Metro.