File:Johnson_county_kansas_courthouse_2009.jpg · Wikimedia Commons · See Wikimedia Commons
Johnson County
Sign in to saveAlso 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 )
- Congressional district
- 3rd
- Website
- jocogov.org
via Wikipedia infobox
Official website

Homepage | Johnson County Kansas
The official website of Johnson County Kansas Government serving citizen and business information needs.
jocogov.org →Link to the official site · 10,205 chars · not written by Vinony
Wikidata facts
- Population
- 609863
- Area
- 1244
- Official website
- www.jocogov.org
- Image
- Johnson county kansas courthouse 2009.jpg
- Households
- 233599
Show 5 more facts
- Commons category
- Johnson County, Kansas
- inception
- 1855-00-00
- water as percent of area
- 1.4
- native label
- Johnson County
- per capita income
- 47997
Sources (10)
via Wikidata · CC0
~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