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254,777 people live in St. Clair County, where the median age is 39.5 and the average individual income is $37,824. Data provided by the U.S. Census Bureau.
Total Population
Median Age
Population Density
Average individual Income
St. Clair County has 101,273 households, with an average household size of 2.47. Data provided by the U.S. Census Bureau. Here’s what the people living in St. Clair County do for work — and how long it takes them to get there. Data provided by the U.S. Census Bureau. 254,777 people call St. Clair County home. The population density is 387.36 and the largest age group is Data provided by the U.S. Census Bureau.
Total Population
Population Density Population Density This is the number of people per square mile in a neighborhood.
Median Age
Men vs Women
Population by Age Group
0-9 Years
10-17 Years
18-24 Years
25-64 Years
65-74 Years
75+ Years
Education Level
Total Households
Average Household Size
Average individual Income
Households with Children
With Children:
Without Children:
Blue vs White Collar Workers
Blue Collar:
White Collar:
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108 W STATE STREET O'FALLON, IL 62269
108 W STATE STREET O'FALLON, IL 62269