Jefferson County, Kentucky

Jefferson County is 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).

Jefferson County
Jefferson County Courthouse (now Louisville Metro Hall) in downtown Louisville
Location within the U.S. state of Kentucky
Kentucky's location within the U.S.
Coordinates: 38°11′N 85°40′W
Country United States
State Kentucky
Founded1780
Named forThomas Jefferson
SeatLouisville
Largest cityLouisville
Area
  Total398 sq mi (1,030 km2)
  Land380 sq mi (1,000 km2)
  Water17 sq mi (40 km2)  4.3%
Population
 (2020)
  Total782,969
  Estimate 
(2023)
772,144
  Density2,000/sq mi (760/km2)
Time zoneUTC−5 (Eastern)
  Summer (DST)UTC−4 (EDT)
Congressional districts3rd, 2nd
Websitelouisvilleky.gov

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.

Jefferson County is the anchor of the Louisville-Jefferson County, KY-IN Metropolitan Statistical Area, locally referred to as Kentuckiana.

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