In 2020, Mercer County, IL had a population of 15.5k people with a median age of 44.8 and a median household income of $57,182. Between 2019 and 2020 the population of Mercer County, IL declined from 15,589 to 15,503, a −0.552% decrease and its median household income declined from $59,787 to $57,182, a −4.36% decrease.
The 5 largest ethnic groups in Mercer County, IL are White (Non-Hispanic) (94.9%), Two+ (Non-Hispanic) (1.67%), White (Hispanic) (1.52%), Two+ (Hispanic) (0.671%), and Black or African American (Non-Hispanic) (0.452%).
None of the households in Mercer 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.
99.3% of the residents in Mercer County, IL are U.S. citizens.
In 2020, the median property value in Mercer County, IL was $111,000, and the homeownership rate was 78.7%. Most people in Mercer County, IL drove alone to work, and the average commute time was 26.8 minutes. The average car ownership in Mercer County, IL was 2 cars per household.