Keystone Airpark (FAA LID: 42J), also known as Keystone Heights Airport, is a public use airport located 9 miles south of Starke in Bradford County, Florida, United States. The airport is situated in Bradford County and Clay County. Owned by the Keystone Airpark Authority, this airport is included in the National Plan of Integrated Airport Systems for 2011–2015, which categorized it as a general aviation facility.