Jefferson County | |
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![]() 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 / 38.19°N 85.66°W | |
Country | ![]() |
State | ![]() |
Founded | 1780 |
Named for | Thomas Jefferson |
Seat | Louisville |
Largest city | Louisville |
Area | |
• Total | 398 sq mi (1,030 km2) |
• Land | 380 sq mi (1,000 km2) |
• Water | 17 sq mi (40 km2) 4.3% |
Population (2020) | |
• Total | 782,969 |
• Density | 2,000/sq mi (760/km2) |
Time zone | UTC−5 (Eastern) |
• Summer (DST) | UTC−4 (EDT) |
Congressional districts | 3rd, 2nd |
Website | www |
Jefferson County is a county located in the U.S. state of Kentucky. As of the 2020 census, the population was 782,969.[1] It is the most populous county in the state. Its county seat and largest city is Louisville, Kentucky.[2]
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