Moline is a city located in Rock Island County, Illinois, United States. With a population of 42,985 in the 2020 census, it is the largest city in Roc…Moline is a city located 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. 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 had a population of about 380,000 in 2023. The city is the ninth-most populous in Illinois outside the Chicago metropolitan area.
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