The Quad Cities is a region of four counties in northwest Illinois and Southeastern Iowa. The urban core consists of five principal cities: Davenport and Bettendorf in Iowa, and Rock Island, Moline, and East Moline in Illinois. These cities are the center of the Quad Cities Metropolitan Area, which, as of 2013, had a population estimate of 383,781 and a CSA (Combined Statistical Area) population of 474,937, making it the 90th largest CSA in the nation.