The cities which make up Johnson County, Kansas are: De SotoEdgertonGardnerFairwayLake QuiviraLeawoodLenexaMerriamMissionMission HillsOlatheOverland ParkPrairie VillageRoeland ParkShawneeSpring HillWestwoodWestwood Hills The new home communities are generally found in the southern or western part of the county. With new homes comes new schools, churches, commercial areas, and new roads. One does not have to go far to see the continuing growth of Johnson County, Kansas.