Fern Creek is a historic community in southeastern Jefferson County, Kentucky, United States. The population was 20,009 at the 2008 census. In 2003, The area was annexed to the city of Louisville as part of a merger between the city and Jefferson County's unincorporated communities. Fern Creek was formerly a census-designated place. It is now considered a neighborhood of Louisville. It is located about 12 miles from Downtown Louisville. The area was agricultural for much of its history, but has been developed as a suburb of Louisville since the 1960s.