Jefferson County | |
|---|---|
 Jefferson County Courthouse in Oskaloosa (1971) | |
 Location within the U.S. state of Kansas | |
 Kansas's location within the U.S. | |
| Coordinates: 39°13′N 95°24′W / 39.217°N 95.400°W | |
| Country |  United States |
| State |  Kansas |
| Founded | August 25, 1855 |
| Named for | Thomas Jefferson |
| Seat | Oskaloosa |
| Largest city | Valley Falls |
| Area | |
| • Total | 557 sq mi (1,440 km2) |
| • Land | 533 sq mi (1,380 km2) |
| • Water | 24 sq mi (60 km2) 4.3% |
| Population | |
| • Total | 18,368 |
| • Estimate (2023)[2] | 18,327  |
| • Density | 33/sq mi (13/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.[3] As of the 2020 census, the county population was 18,368.[1] The county was named after Thomas Jefferson, the 3rd president of the United States.
- ^ a b "QuickFacts; Jefferson County, Kansas; Population, Census, 2020 & 2010". United States Census Bureau. Archived from the original on August 17, 2021. Retrieved August 16, 2021.
- ^ "Annual Estimates of the Resident Population for Counties: April 1, 2020 to July 1, 2023". United States Census Bureau. Retrieved March 24, 2024.
- ^ "Find a County". National Association of Counties. Archived from the original on May 31, 2011. Retrieved June 7, 2011.