Jefferson County
Also known as Jefferson County, Kansas, Jefferson County, KS
county in Kansas, United States
Key facts
- Country
- United States
- State
- Kansas
- Founded
- August 25, 1855
- Named after
- Thomas Jefferson
- Seat
- Oskaloosa
- Largest city
- Oskaloosa
- Total
- 557 sq mi (1,440 km )
- Land
- 533 sq mi (1,380 km )
- Water
- 24 sq mi (62 km ) 4.3%
- Estimate 2025
- 18,296
- Density
- 34.5/sq mi (13.3/km )
- Time zone
- UTC−6 ( Central )
- Summer dst
- UTC−5 ( CDT )
~8 min read
Article
Jefferson County is a county located in the U.S. state of Kansas. Its county seat and most populous city is Oskaloosa. As of the 2020 census, the county population was 18,368. The county was named after Thomas Jefferson, the 3rd president of the United States.
History
Gallery (3)
On the map
13 mapped locations