Founded in 1836, Jefferson County is one of 72 counties in the state of Wisconsin. Historically, Jefferson County was formed from Milwaukee County. The city of Jefferson is the county seat. With FIPS code of 55, Jefferson County has a population of 84,943 and area of 556.47 square miles (1,441 km2).
List of all cities in Jefferson County, WI alphabetically
- Fort Atkinson, WI
- Helenville, WI
- Ixonia, WI
- Jefferson, WI
- Johnson Creek, WI
- Lake Mills, WI
- Palmyra, WI
- Sullivan, WI
- Waterloo, WI
- Watertown, WI