Denver International Airport (IATA: DEN, ICAO: KDEN, FAA LID: DEN), locally referred to as DIA, is an international airport in the western United States, primarily serving metropolitan Denver, Colorado, as well as the greater Front Range Urban Corridor. At 33,531 acres (52. 4 sq mi; 135. 7 km2), it is the largest airport in North America by total land area and the second largest in the world. Runway 16R/34L, with a length of 16,000 feet (3. 03 mi; 4. 88 km), is the longest public use runway in North America and the seventh longest in the world. With over 35,000 employees, the airport is the largest employer in Colorado.