Fairdale is a former census-designated place in southern Jefferson County, Kentucky, United States. The population was 7,658 at the 2000 census. In 2003, the area was annexed to the city of Louisville due to a merger between the city and Jefferson County's unincorporated community. Fairdale is now a neighborhood within the city limits of Louisville. It is within the boundaries of the Fairdale Fire Protection District which serves Fairdale and surrounding areas including the large Jefferson Memorial Forest and historic South Park Country Club, the oldest country club in the state of Kentucky.
Fairdale is located at 38°06′18″N 85°45′32″W. It is in southern Jefferson County.
According to the United States Census Bureau, the Census Designated Place (CDP) has a total area of 14.84 km² (5.73 mi²), all land.
The climate in this area is characterized by hot, humid summers and generally mild to cool winters. According to the Köppen Climate Classification system, Fairdale has a humid subtropical climate, abbreviated "Cfa" on climate maps.
At the 2000 census there were 7,658 people in 2,948 households, including 2,154 families, in the CDP. The population density was 518.7/km² (1,343.2/mi²).