Park Hills is a home rule-class city in Kenton County, Kentucky, United States. The population was 3,162 at the 2020 census. It is a suburb o…Park Hills is a home rule-class city in Kenton County, Kentucky, United States. The population was 3,162 at the 2020 census. It is a suburb of the Cincinnati metropolitan area. Much of the city was listed on the National Register of Historic Places in 2008 as the Park Hills Historic District.