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Johnson County
Also known as Johnson County, Kansas, Johnson County, KS
county in Kansas, United States
Key facts
- Country
- United States
- State
- Kansas
- Founded
- August 25, 1855
- Named after
- Thomas Johnson
- Seat
- Olathe
- Largest city
- Overland Park
- Total
- 480 sq mi (1,200 km )
- Land
- 473 sq mi (1,230 km )
- Water
- 6.5 sq mi (17 km ) 1.4%
- Estimate 2025
- 636,906
- Density
- 1,290/sq mi (498/km )
- Time zone
- UTC−6 ( Central )
- Summer dst
- UTC−5 ( CDT )
~24 min read
Article
Johnson County is a county in the U.S. state of Kansas, along the border of the state of Missouri. Its county seat is Olathe. As of the 2020 census, the population was 609,863, making it the most populous county in Kansas. The county was named after Thomas Johnson, a Methodist missionary who was one of the state's first settlers. Largely suburban, the county contains a number of suburbs of Kansas City, Missouri, including Overland Park, a principal city of and the second most populous city in the Kansas City Metropolitan Area.
History
Gallery (8)
On the map
11 mapped locations
