Jefferson County
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- Population
- 86,003
- Area
- 556.49 sq mi (1,441.31 km²), 26.25 sq mi water
- Median age
- 41.5
- Households
- 34,873
- Persons per household
- 2.4
- Median household income
- $83,750
- Median house value
- $274,100
Demographics: 2020–2024 ACS
Overnight
41°F
Clear
Monday
64°F
Sunny
Monday Night
46°F
Mostly Clear
Tuesday
71°F
Sunny1% precip
Cities & Towns in Jefferson County
Aztalan TownCambridgeCold Spring TownConcord TownFarmington TownFort AtkinsonHebronHebron TownHelenvilleIxoniaIxonia TownJeffersonJefferson TownJohnson CreekKoshkonong TownLac La BelleLake KoshkonongLake MillsLake Mills TownLake RipleyMilford TownOakland TownPalmyraPalmyra TownRomeSullivanSullivan TownSumner TownWaterlooWaterloo TownWatertownWatertown TownWhitewater