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St. Clair County Population

All St. Clair County population data above are from the US Census Bureau.

St. Clair County Demographics Summary

population icon Population

With 262,759 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 208,419 people and Sangamon County with 197,499 people are right behind you.

St. Clair County 262,759
Champaign County 208,419
Sangamon County 197,499

race icon Race & Ethnicity

The largest St. Clair County racial/ethnic groups are White (62.5%) followed by Black (29.7%) and Hispanic (3.7%).

Top Race & Ethnicity Groups %
White 62.5%
Black 29.7%
Hispanic 3.7%

income icon Median Income

In 2015, the median household income of St. Clair County residents was $49,895. St. Clair County households made slightly more than Moultrie County households ($49,681) and Rock Island County households ($48,817) . However, 18.2% of St. Clair County residents live in poverty.

Median Household Income
St. Clair County $49,895
Moultrie County $49,681
Rock Island County $48,817

age icon Median Age

The median age for St. Clair County residents is 37.7 years young.

Median Age 37.7

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Starter Report Sample

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 St. Clair County, IL report will have the same data, charts & graphs as this sample.

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