Moline is a city located in Rock Island County, Illinois, United States. With a population of 43,977 in 2010, it is the largest city in Rock Island County. Moline is one of the Quad Cities, along with neighboring East Moline and Rock Island in Illinois and the cities of Davenport and Bettendorf in Iowa. The Quad Cities has a population estimate of 381,342. The city is the ninth-most populated city in Illinois outside the Chicago Metropolitan Area. The corporate headquarters of Deere & Company is located in Moline, as was Montgomery Elevator, which was founded and headquartered in Moline until 1997, when it was acquired by Kone Elevator, which has its U.S. Division headquartered in Moline. Quad City International Airport, Niabi Zoo, Black Hawk College, and the Quad Cities campus of Western Illinois University-Quad Cities. Moline is a retail hub for the Illinois Quad Cities, as South Park Mall and numerous big-box shopping plazas are located in the city.