Moline 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 I…Moline 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.
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