In 2020, Rock Island County, IL had a population of 143k people with a median age of 40.1 and a median household income of $55,980. Between 2019 and 2020 the population of Rock Island County, IL declined from 143,873 to 142,801, a −0.745% decrease and its median household income grew from $54,858 to $55,980, a 2.05% increase.
The 5 largest ethnic groups in Rock Island County, IL are White (Non-Hispanic) (71.2%), Black or African American (Non-Hispanic) (9.82%), White (Hispanic) (7.32%), Two+ (Non-Hispanic) (3.07%), and Other (Hispanic) (2.87%).
None of the households in Rock Island County, IL reported speaking a non-English language at home as their primary shared language. This does not consider the potential multi-lingual nature of households, but only the primary self-reported language spoken by all members of the household.
95.4% of the residents in Rock Island County, IL are U.S. citizens.
The largest universities in Rock Island County, IL are Augustana College (894 degrees awarded in 2020), Black Hawk College (639 degrees), and Midwest Technical Institute-Moline (243 degrees).
In 2020, the median property value in Rock Island County, IL was $123,100, and the homeownership rate was 67.9%.
Most people in Rock Island County, IL drove alone to work, and the average commute time was 19.8 minutes. The average car ownership in Rock Island County, IL was 2 cars per household.
Rock Island County, IL borders Henry County, IL, Mercer County, IL, Whiteside County, IL, Clinton County, IA, Louisa County, IA, Muscatine County, IA, and Scott County, IA.