St. Clair County, MO — Demographics & Population
Population, age distribution, race & ethnicity, and education data
Population Overview
Source: Census Bureau ACS (2023)Total Population
9,451
Male
4,797
50.8%
Female
4,654
49.2%
Median Age
47.2 yrs
Avg Household Size
2.3
Foreign Born
1.0%
Race & Ethnicity
Source: Census Bureau ACS (2023)Age Distribution
Source: Census Bureau ACS (2023)Education
Source: Census Bureau ACS (2023)Bachelor's or Higher9.9%
High School or Higher41.8%
Other Demographics
Source: Census Bureau ACS (2023)Veterans
7.3%
Disability
0.0%
Non-English Home
8.8%
Married
41.8%
St. Clair County, MO has a population of 9,451 according to 2023 Census Bureau estimates. The median age is 47.2 years. The largest racial or ethnic group is White at 93.6% of the population. 9.9% of residents hold a bachelor's degree or higher. 1.0% of residents are foreign-born.