Overland Park is a city in Johnson County, Kansas, United States, and the second-most populous city in the state of Kansas. It is one of four priā¦Overland Park is a city in Johnson County, Kansas, United States, and the second-most populous city in the state of Kansas. It is one of four principal cities in the Kansas City metropolitan area and the most populous suburb of Kansas City, Missouri. As of the 2020 census, the population of the city was 197,238.