Jefferson County
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- Population
- 18,349
- Area
- 532.62 sq mi (1,379.49 km²), 24.05 sq mi water
- Median age
- 44.2
- Households
- 7,412
- Persons per household
- 2.5
- Median household income
- $81,278
- Median house value
- $216,900
Demographics: 2020–2024 ACS
This Afternoon
76°F
Sunny
Tonight
48°F
Clear then Patchy Fog
Monday
72°F
Patchy Fog then Sunny
Monday Night
51°F
Clear
Cities & Towns in Jefferson County
Local News
Jefferson County, Kansas
Published September 16
2026 Tax Sale October 1st at 10 AM
Tax sale date is October 1st in the Main Court Room. Registration starts at 9am with the auction starting at 10:00am. Pre-Registration Forms are available at the Treasurer's Office.
Jefferson County, Kansas
Published September 03
Grief Support Group
Grief Support Group Navigating the pain of loss is never easy, but you don’t have to do it alone. We are here to help you heal.
Jefferson County, Kansas
Published September 03
Get your Flu Shot
Flu Before Boo! Get Your Flu Vaccine Before Halloween! Jefferson County Health Department Flu Shot Opportunities 1212 Walnut St, Oskaloosa
Jefferson County, Kansas
Published September 03
Get your Flu Shot
Flu Before Boo! Get Your Flu Vaccine Before Halloween! Jefferson County Health Department Flu Shot Opportunities 1212 Walnut St, Oskaloosa