Jefferson County
Also known as Jefferson County, Wisconsin, Jefferson County, WI
county in Wisconsin, United States
Key facts
- Country
- United States
- State
- Wisconsin
- Named after
- Thomas Jefferson
- Seat
- Jefferson
- Largest city
- Watertown
- Total
- 583 sq mi (1,510 km )
- Land
- 556 sq mi (1,440 km )
- Water
- 26 sq mi (67 km ) 4.5%
- Estimate 2025
- 86,505
- Density
- 153/sq mi (59.0/km )
- Time zone
- UTC−6 ( Central )
- Summer dst
- UTC−5 ( CDT )
- Congressional district
~7 min read
Article
Jefferson County is a county in the U.S. state of Wisconsin. As of the 2020 census, the population was 84,900. Its county seat is Jefferson. Jefferson County comprises the Watertown-Fort Atkinson, WI Micropolitan Statistical Area, which is also included in the Milwaukee-Racine-Waukesha, WI Combined Statistical Area.
History