In 2018, Johnson County, IL had a population of 12.6k people with a median age of 43.2 and a median household income of $50,923. Between 2017 and 2018 the population of Johnson County, IL declined from 12,899 to 12,602, a -2.3% decrease and its median household income grew from $45,743 to $50,923, a 11.3% increase.
The 5 largest ethnic groups in Johnson County, IL are White (Non-Hispanic) (84.5%), Black or African American (Non-Hispanic) (11.6%), White (Hispanic) (2.9%), Asian (Non-Hispanic) (0.317%), and Two+ (Non-Hispanic) (0.254%). 0% of the households in Johnson County, IL speak a non-English language at home as their primary language, and 99% of the residents in Johnson County, IL are U.S. citizens.
In 2018, the median property value in Johnson County, IL was $99,400, and the homeownership rate was 84.1%. Most people in Johnson County, IL drove alone to work, and the average commute time was 25.2 minutes. The average car ownership in Johnson County, IL was 2 cars per household.