Clayton Municipal Airpark (IATA: CAO[2], 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.

[1] It is included in the National Plan of Integrated Airport Systems for 2011–2015, which categorized it as a general aviation facility.

[3] Clayton Municipal Airpark covers an area of 755 acres (306 ha) at an elevation of 4,970 feet (1,515 m) above mean sea level.

[1] For the 12-month period ending April 21, 2022, the airport had 3,300 aircraft operations, an average of 63 per week: 100% general aviation.

At that time there were 10 aircraft based at this airport: 9 single-engine and 1 helicopter.