Fast Facts
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Rock Island is the county seat of Rock Island County, Illinois, United States. The population was 39,684 at the 2000 census. It is one of the Quad Cities, along with neighboring Moline, East Moline, and the Iowa cities of Davenport and Bettendorf. The original Rock Island, from which the city gets its name, is the largest island in the Mississippi River and is now known as Arsenal Island.
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