Rock Island County, Illinois Basics:
Rock Island County Illinois - Government Site
Population: 147,514
Area: 428 square miles
County seat: Rock Island
Area code(s) in use: 309
Time zone: CST
High school graduate or higher: 87.1%
Bachelor's degree or higher: 21.5%
Median household income: $48,205
Persons in poverty: 11.9%
Home ownership rate: 70.9%
Mean travel time to work: 18.7 minutes
Adjacent counties:
Clinton (IA) Henry Louisa (IA) Mercer Muscatine (IA) Scott (IA) Whiteside