Jefferson County, Kansas
Jefferson County, Kansas | |
|---|---|
Jefferson County Courthouse in Oskaloosa (1971) | |
Location within the U.S. state of Kansas | |
| Country | United States |
| State | Kansas |
| Founded | August 25, 1855 |
| Named after | Thomas Jefferson |
| Seat | Oskaloosa |
| Largest city | Oskaloosa |
| Area | |
• Total | 557 sq mi (1,440 km2) |
| • Land | 533 sq mi (1,380 km2) |
| • Water | 24 sq mi (62 km2) 4.3% |
| Population (2020) | |
• Total | 18,368 |
• Estimate (2023) | 18,327 |
| • Density | 34.5/sq mi (13.3/km2) |
| Time zone | UTC−6 (Central) |
| • Summer (DST) | UTC−5 (CDT) |
| Congressional district | 1st |
| Website | jfcountyks.com |
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.