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The population of Rock Island, Illinois was 39,684 at the 2000 census. It is the county seat of Rock Island County, IllinoisRock Island County and is one of the Quad Cities, along with neighboring Moline, IllinoisMoline and the Iowa cities of Davenport, IowaDavenport and Bettendorf, IowaBettendorf. Source: http://en.wikipedia.
