Rock Island County is a county located in the U.S. state of Illinois, bounded on the west by the Mississippi River. According to the 2020 census, it had a population of 144,672. Its county seat is Roc

Carbon Cliff is a village in Rock Island County, Illinois, United States. The population was 1,846 at the 2020 census, down from 2,134 at the 2010 census. It lies in the south part of Hampton Township