Clayton Municipal Airpark (IATA: CAO, ICAO: KCAO, FAA LID: CAO) is a town owned, public use airport located two nautical miles (4 km) east of the central business district of Clayton, a town in Union County, New Mexico, United States. It is included in the National Plan of Integrated Airport Systems for 2011–2015, which categorized it as a general aviation facility.