Lake Elmo Airport is a public airport located just outside the city of Lake Elmo in Washington County, Minnesota, United States, about 12 miles east of the central business district of St. Paul. Although most airports in the United States use the same three-letter location identifier for the FAA and International Air Transport Association (IATA), this airport is assigned 21D by the FAA but has no designation from the IATA or ICAO. It is also home to a Civil Air Patrol squadron. It is included in the Federal Aviation Administration (FAA) National Plan of Integrated Airport Systems for 2021–2025 in which it is categorized as a regional general aviation facility. History During World War II the airfield was used by the United States Army Air Forces. In 2022, the airport opened a new runway 14/32 which is long, it replaced an old runway which was long. Facilities and aircraft Lake Elmo covers an area of at an elevation of above mean sea level. It has two asphalt runways; 14/32 is 3,500 by 75 feet , and 4/22 is 3,500 by 75 feet . For the 12-month period ending July 31, 2019, the airport had 26,498 aircraft operations, an average of 73 per day: 95% general aviation, 4% air taxi, and 1% military. In August 2022, there were 169 aircraft based at this airport: 162 single-engine, 4 multi-engine, and 3 helicopter. Superfund Site The Lake Elmo Airport is connected to the contamination at the Baytown Township Ground Water Plume Superfund site. The site is listed due to trichloroethylene contamination of a groundwater aquifer used for local drinking water supplies. See also Minnesota World War II Army Airfields References External links Baytown Township Ground Water Plume EPA Factsheet Airports in Minnesota Airfields of the United States Army Air Forces in Minnesota Transportation buildings and structures in Washington County, Minnesota Superfund sites in Minnesota