In 2017, Marion County, IL had a population of 38.3k people with a median age of 41.8 and a median household income of $44,679. Between 2016 and 2017 the population of Marion County, IL declined from 38,503 to 38,305, a -0.514% decrease and its median household income grew from $43,427 to $44,679, a 2.88% increase.
The population of Marion County, IL is 91.5% White Alone, 3.39% Black or African American Alone, and 2.16% Two or More Races. N/A% of the people in Marion County, IL speak a non-English language, and 99.3% are U.S. citizens.
The median property value in Marion County, IL is $71,900, and the homeownership rate is 74.3%. Most people in Marion County, IL commute by Drove Alone, and the average commute time is 19.9 minutes. The average car ownership in Marion County, IL is 2 cars per household.