Johnson County, Kansas

Johnson County
County
Former Johnson County Courthouse in Olathe (2009). It opened in 1952, closed in 2020, then demolished in 2021 after a new courthouse was finished.[1][2]
Former Johnson County Courthouse in Olathe (2009). It opened in 1952, closed in 2020, then demolished in 2021 after a new courthouse was finished.[1][2]
Map of Kansas highlighting Johnson County
Location within the U.S. state of Kansas
Map of the United States highlighting Kansas
Kansas's location within the U.S.
Coordinates: 38°52′N 94°52′W / 38.867°N 94.867°W / 38.867; -94.867
Country United States
State Kansas
FoundedAugust 25, 1855
Named forThomas Johnson
SeatOlathe
Largest cityOverland Park
Area
 • Total480 sq mi (1,200 km2)
 • Land473 sq mi (1,230 km2)
 • Water6.5 sq mi (17 km2)  1.4%
Population
 (2020)[3]
 • Total609,863
 • Estimate 
(2023)[4]
622,237 Increase
 • Density1,300/sq mi (490/km2)
Time zoneUTC−6 (Central)
 • Summer (DST)UTC−5 (CDT)
Congressional district3rd
Websitejocogov.org

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.[5] As of the 2020 census, the population was 609,863, the most populous county in Kansas.[3] 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 second most populous city in the Kansas City Metropolitan Area.[6][7]

  1. ^ Cite error: The named reference OldCourtHouse was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference NewCourtHouse was invoked but never defined (see the help page).
  3. ^ a b "QuickFacts; Johnson County, Kansas; Population, Census, 2020 & 2010". United States Census Bureau. Archived from the original on August 15, 2021. Retrieved August 15, 2021.
  4. ^ "Annual Estimates of the Resident Population for Counties: April 1, 2020 to July 1, 2023". United States Census Bureau. Retrieved March 24, 2024.
  5. ^ "Fast Facts". Johnson County Kansas. Archived from the original on July 16, 2019.
  6. ^ "Home Page". Johnson County Kansas. Retrieved November 20, 2019.
  7. ^ McCammon, Sarah (September 4, 2017). "As Kansas City Booms And Sprawls, Trying Not To Forget Those In Between". National Public Radio. Retrieved July 10, 2020.