All Jefferson County population data above are from the US Census Bureau.
With 38,353 people, Jefferson County is the 36th most populated county in the state of Illinois out of 102 counties. But watch out, Jefferson County, because Clinton County with 37,786 people and Marion County with 38,339 people are right behind you.
The largest Jefferson County racial/ethnic groups are White (86.2%) followed by Black (7.9%) and Hispanic (2.3%).
In 2015, the median household income of Jefferson County residents was $43,247. Jefferson County households made slightly more than Union County households ($42,606) and Vermilion County households ($42,977) . However, 17.0% of Jefferson County residents live in poverty.
The median age for Jefferson County residents is 40.7 years young.
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The District of Columbia Starter Report, shown on the left, will give you a good idea of what to expect in a Starter Report. The Jefferson County, IL report will have the same data, charts & graphs as this sample.
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