In 2020, Jefferson County, IL had a population of 37.8k people with a median age of 41.2 and a median household income of $51,662. Between 2019 and 2020 the population of Jefferson County, IL declined from 37,985 to 37,774, a −0.555% decrease and its median household income grew from $49,896 to $51,662, a 3.54% increase.
The 5 largest ethnic groups in Jefferson County, IL are White (Non-Hispanic) (84.8%), Black or African American (Non-Hispanic) (7.87%), Two+ (Non-Hispanic) (3.12%), White (Hispanic) (1.46%), and Asian (Non-Hispanic) (1.13%).
None of the households in Jefferson 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.
99.4% of the residents in Jefferson County, IL are U.S. citizens.
The largest universities in Jefferson County, IL are Rend Lake College (1,223 degrees awarded in 2020).
In 2020, the median property value in Jefferson County, IL was $97,100, and the homeownership rate was 71.8%.
Most people in Jefferson County, IL drove alone to work, and the average commute time was 19.1 minutes. The average car ownership in Jefferson County, IL was 2 cars per household.