In 2017, Mercer County, IL had a population of 15.8k people with a median age of 44.8 and a median household income of $55,649. Between 2016 and 2017 the population of Mercer County, IL declined from 15,971 to 15,794, a -1.11% decrease and its median household income declined from $55,750 to $55,649, a -0.181% decrease.
The 5 largest ethnic groups in Mercer County, IL are White (Non-Hispanic) (95.8%), White (Hispanic) (1.33%), Two or More Races (Non-Hispanic) (1.04%), Some Other Race (Hispanic) (0.684%), and Black or African American (Non-Hispanic) (0.557%). N/A% of the people in Mercer County, IL speak a non-English language, and 99.6% are U.S. citizens.
The median property value in Mercer County, IL is $105,100, and the homeownership rate is 77.4%. Most people in Mercer County, IL commute by Drove Alone, and the average commute time is 25.5 minutes. The average car ownership in Mercer County, IL is 2 cars per household.