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Jefferson County, Kansas

Jefferson County
Jefferson County Courthouse in Oskaloosa (1971)
Jefferson County Courthouse in Oskaloosa (1971)
Map of Kansas highlighting Jefferson County
Location within the U.S. state of Kansas
Map of the United States highlighting Kansas
Kansas's location within the U.S.
Coordinates: 39°13′N 95°24′W / 39.217°N 95.400°W / 39.217; -95.400
Country United States
State Kansas
FoundedAugust 25, 1855
Named forThomas Jefferson
SeatOskaloosa
Largest cityValley Falls
Area
 • Total557 sq mi (1,440 km2)
 • Land533 sq mi (1,380 km2)
 • Water24 sq mi (60 km2)  4.3%
Population
 • Total18,368
 • Density34.5/sq mi (13.3/km2)
Time zoneUTC−6 (Central)
 • Summer (DST)UTC−5 (CDT)
Congressional district1st
Websitejfcountyks.com

Jefferson County (county code JF) is a county in the U.S. state of Kansas. In 2020, 18,368 people lived there.[1] Its county seat is Oskaloosa.[2] Its biggest city is Valley Falls.

  1. 1.0 1.1 "QuickFacts: Jefferson County, Kansas". United States Census Bureau. Retrieved October 1, 2023.
  2. "Find a County". National Association of Counties. Archived from the original on 2011-05-31. Retrieved 2011-06-07.

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