Johnson County, Kansas
Johnson County | |
|---|---|
Former Johnson County Courthouse in Olathe (2009). It was opened in 1952, closed in 2020, then demolished in 2021 after a new courthouse was finished. | |
Location within the U.S. state of Kansas | |
Kansas's location within the U.S. | |
| Coordinates: 38°52′N 94°52′W / 38.867°N 94.867°W | |
| Country | United States |
| State | Kansas |
| Founded | August 25, 1855 |
| Named after | Thomas Johnson |
| Seat | Olathe |
| Largest city | Overland Park |
| Area | |
• Total | 480 sq mi (1,200 km2) |
| • Land | 473 sq mi (1,230 km2) |
| • Water | 6.5 sq mi (17 km2) 1.4% |
| Population (2020) | |
• Total | 609,863 |
• Estimate (2023) | 622,237 |
| • Density | 1,300/sq mi (490/km2) |
| Time zone | UTC−6 (Central) |
| • Summer (DST) | UTC−5 (CDT) |
| Congressional district | 3rd |
| Website | jocogov.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. 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.