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.
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.