In 2019, Mercer County, IL had a population of 15.6k people with a median age of 44.9 and a median household income of $59,787. Between 2018 and 2019 the population of Mercer County, IL declined from 15,693 to 15,589, a −0.663% decrease and its median household income grew from $58,011 to $59,787, a 3.06% increase.
The 5 largest ethnic groups in Mercer County, IL are White (Non-Hispanic) (95.3%), White (Hispanic) (1.74%), Two+ (Non-Hispanic) (1.17%), Black or African American (Non-Hispanic) (0.629%), and Asian (Non-Hispanic) (0.366%). 0% of the households in Mercer County, IL speak a non-English language at home as their primary language.
99.8% of the residents in Mercer County, IL are U.S. citizens.
In 2019, the median property value in Mercer County, IL was $107,600, and the homeownership rate was 79%. Most people in Mercer County, IL drove alone to work, and the average commute time was 25.7 minutes. The average car ownership in Mercer County, IL was 2 cars per household.