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Fast Facts

Founding: Johnson County was founded on Aug. 25, 1855, as one of the first 33 counties recognized by the Legislative Act of 1855 in the Territory of Kansas. Statehood was granted six years later as Kansas became the 34th state on Jan. 29, 1861. The state now has 105 counties.

Namesake: Named after the Rev. Thomas Johnson, a Methodist minister who established  the Shawnee Indian Mission in 1829. The mission, a National and Kansas Historic Site, is located in the city of  Fairway.

County Seat: Olathe.

Johnson County Government: Organized on Sept. 7, 1857.

20 Cities: Overland Park, Olathe, Shawnee, Leawood, Lenexa, Mission, Mission Hills, Mission Woods, Merriam, Lake Quivira, Fairway, Westwood, Westwood Hills, Prairie Village, Roeland Park, De Soto, Spring Hill, Gardner, Edgerton, and Bonner Springs.

Six Public School Districts: Shawnee Mission, Olathe, Blue Valley, Spring Hill, Gardner-Edgerton, and De Soto. Student enrollment (K-12) totaled more than 88,500 for the 2011-2012 school year. That’s more than the individual populations of 100 counties in Kansas.

Seven Townships: Lexington, Olathe, McCamish, Spring Hill, Gardner, Oxford, and Aubry.

Size: 477 square miles or approximately 307,200 acres.

Urban land: Approximately 59 percent of Johnson County has been incorporated into city limits.

Rural land: Approximately 41 percent of Johnson County remains unincorporated/rural areas.

Median age: 36.5

Median Household Income (Estimated 2012): $74,761

Population: Johnson County is the most populous county in the state of Kansas.

  • 544,179 (2010 Census)
  • 574,272 (esitmated Census population in 2014)

Miscellaneous Statistics:

  • Colleges: 3
  • Jails: 3 
  • Hospitals: 6
  • Community centers/multi-service centers: 10
  • Museums: 10
  • Airports including heliports:  11
  • Libraries: 16
  • Law enforcement stations: 18
  • Creeks: 26
  • Swimming pools, beaches, and aquatic centers: 27
  • Golf courses: 28
  • Fire stations: 39
  • Cemeteries: 39
  • Private schools: 42 buildings
  • Nursing homes: 66
  • Hotels: 77
  • Shopping centers: 90
  • Miles of bicycle roadway routes: 102
  • Historic sites: 123
  • Public schools: 186 buildings in six public school districts
  • Miles of biking, jogging, hiking trails: 268
  • Places of worship: 312
  • Parks: 340 (city and county) with approximately 16,000 acres
  • Apartment complexes: 360 
  • Miles of county roads: 476 including about 224 miles of gravel roads.
  • Farms: 610, including 29 farms with 1,000 acres or more and most (252) with 10 to 49 acres
  • Restaurants: 1,522
  • Retail parcels: 1,533
  • Office parcels: 1,609
  • Warehouse parcels: 1,933
  • Miles of city streets: 3,606
  • Residential parcels: More than 168,000, including single-family, multi-family, condominiums,  townhouses, and farmsteads.