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Quad Cities
This article is about the cities on the Illinois–Iowa border known collectively as the "Quad Cities". For other uses, see Quad Cities (disambiguation).
Metropolitan Statistical Area in the United States
The Quad Cities is a region of five cities (originally Tri-Cities, later four, see History) in the U.S. states of Iowa and Illinois: Davenport and Bettendorf (the fifth to be included) in southeastern Iowa, and Rock Island, Moline and East Moline (the fourth to be included) in northwestern Illinois.[2][3][4][5] These cities are the center of the Quad Cities metropolitan area, a region within the Mississippi River Valley, which as of 2023, had a population estimate of 467,817 and a Combined Statistical Area (CSA) population of 474,019, making it the 90th-largest CSA in the nation.[6][7][8]