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Johnson County is located in the eastern part of the State. It is bounded on the north by Leavenworth and Wyandotte counties, on the east by Missouri, on the south by Miami, and on the west by Douglas County. It is twenty-one miles from north to south and twenty-four from east to west, containing 475 square miles, or 304,000 acres. At the first organization of the county, in 1855, the Kansas river constituted its entire northern boundary, but in 1859 the present boundary was established.


County Seat: Olathe, Kansas

Date organized:1855

County History:

  1. Cutler's History of the State of Kansas, Johnson County 
  2. History of Johnson County 

Historic Landmarks, State, National:

  1. Shawnee Indian Mission  | Facebook 
  2. Watson's Drug Store Owner's Home
  3. Turner Barn

County Historical Society:

  1. Johnson County Museum  | Facebook 
  2. Johnson County Genealogical Society 

Websites about the county:

  1. Johnson County Government 
  2. City of Olathe,Kansas | Facebook
  3. City of Overland Park,Kansas 
  4. Johnson County on Wikipedia 
  5. City of Shawnee,Kansas