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All St. Clair County population data above are from the US Census Bureau.
The population data for St. Clair County are from the Census' American Community Survey 2018 5-year estimates and the Census' 2018 Population Estimates. The demographic data for Champaign County, Cumberland County, Sangamon County, and Winnebago County are the most current, comparable demographics available from the US Census Bureau, are from the American Community Survey 2018 5-year estimates, and were downloaded on 19 December 2019. Check out our FAQ section for more details.
With 263,463 people, St. Clair County is the 9th most populated county in the state of Illinois out of 102 counties. But watch out, St. Clair County, because Champaign County with 209,448 people and Sangamon County with 197,661 people are right behind you.
The largest St. Clair County racial/ethnic groups are White (61.9%) followed by Black (30.0%) and Hispanic (4.0%).
In 2018, the median household income of St. Clair County residents was $53,681. St. Clair County households made slightly more than Cumberland County households ($53,376) and Winnebago County households ($52,743) . However, 16.4% of St. Clair County residents live in poverty.
The median age for St. Clair County residents is 38.3 years young.
86% of people CANNOT find the data they're looking for on the US Census Bureau website. Source: Nielsen Norman Group
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