Moline ( moh-LEEN) is a city in Rock Island County, Illinois, United States. With a population of 42,985 in the 2020 census, it is the largest city in Rock Island County and the ninth-most populous in Illinois outside the Chicago metropolitan area. Moline is one of the Quad Cities at the confluence of the Rock and Mississippi rivers, along with neighboring East Moline and Rock Island in Illinois and the cities of Davenport and Bettendorf in Iowa. The Quad Cities metropolitan area had a population of approximately 380,000 as of 2023. Moline was established in 1843. The name derives from the French moulin meaning "mill [town]". The corporate headquarters of Deere & Company is located in Moline, as was Montgomery Elevator; its acquirer Kone has its U.S. division headquartered in Moline. Quad Cities International Airport, Black Hawk College, and the Quad Cities campus of Western Illinois University-Quad Cities are located in Moline. It is a retail hub for the Illinois Quad Cities, as South Park Mall and numerous big-box shopping plazas are located in the city. Moline's downtown serves as one of the civic and recreational hubs of the region as many events take place at the 12,000-seat Vibrant Arena at The MARK and at John Deere Commons.