Jefferson County, Wisconsin

Jefferson County
Jefferson County
County
	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	United States
State	Wisconsin
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 (2020)
• 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.jeffersoncountywi.gov

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] Jefferson County comprises the Watertown-Fort Atkinson, WI Micropolitan Statistical Area, which is also included in the Milwaukee-Racine-Waukesha, WI Combined Statistical Area.

^ ^a ^b Cite error: The named reference 2020-census-55055 was invoked but never defined (see the help page).
^ "Find a County". National Association of Counties. Archived from the original on May 31, 2011. Retrieved June 7, 2011.