Jefferson County | |
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![]() Jefferson County courthouse | |
![]() Location within the U.S. state of Wisconsin | |
![]() Wisconsin's location within the U.S. | |
Coordinates: 43°01′N 88°47′W / 43.02°N 88.78°W | |
Country | ![]() |
State | ![]() |
Founded | 1839 |
Named for | Thomas Jefferson |
Seat | Jefferson |
Largest city | Watertown |
Area | |
• Total | 583 sq mi (1,510 km2) |
• Land | 556 sq mi (1,440 km2) |
• Water | 26 sq mi (70 km2) 4.5% |
Population | |
• Total | 84,900 |
• Density | 152.6/sq mi (58.9/km2) |
Time zone | UTC−6 (Central) |
• Summer (DST) | UTC−5 (CDT) |
Congressional district | 5th |
Website | www |
Jefferson County is a county in the U.S. state of Wisconsin. As of the 2020 census, the population was 84,900.[1] Its county seat is Jefferson.[2]