Tri-County Regional Airport (IATA: LNR, ICAO: KLNR, FAA LID: LNR) is a public use airport in Sauk County, Wisconsin, United States. It is located two nautical miles (4 km) north of the central business district of Lone Rock, a village in Richland County, Wisconsin. The airport owned by the Wisconsin counties of Sauk, Richland, and Iowa.