Kingsley is a home rule-class city in Jefferson County, Kentucky, United States. The population was 381 as of the 2010 census, down from 42…Kingsley is a home rule-class city in Jefferson County, Kentucky, United States. The population was 381 as of the 2010 census, down from 428 at the 2000 census. It is a suburb of Louisville. Many years ago the community was part of Farmington, the once sprawling farm of the Speed family. On March 1, 1924, developer C.C. Hieatt purchased 46.063 acres off Taylorsville Road and created the subdivision of Kingsley as an extension of the Strathmoor neighborhood. On December 21, 1939, Kingsley was incorporated as a 6th-class city.