Knox County Regional Airport (IATA: RKD, ICAO: KRKD, FAA LID: RKD) is a county-owned, public-use airport in the town of Owls Head, Knox County, Maine, United States. It is located three nautical miles (6 km) south of the central business district of Rockland, Maine. The airport serves the residents of midcoast Maine with commercial and charter aviation services. Scheduled airline service is subsidized by the Essential Air Service program. It is also a major hub of freight and mail service to Maine's island communities including Matinicus, North Haven and Vinalhaven.