St. Charles County, MO — Demographics & Population
Population, age distribution, race & ethnicity, and education data
Population Overview
Source: Census Bureau ACS (2023)Total Population
409,830
Male
202,660
49.4%
Female
207,170
50.6%
Median Age
39.6 yrs
Avg Household Size
2.5
Foreign Born
4.3%
Race & Ethnicity
Source: Census Bureau ACS (2023)Age Distribution
Source: Census Bureau ACS (2023)Education
Source: Census Bureau ACS (2023)Bachelor's or Higher29.3%
High School or Higher44.8%
Other Demographics
Source: Census Bureau ACS (2023)Veterans
5.3%
Disability
0.0%
Non-English Home
3.1%
Married
47.0%
St. Charles County, MO has a population of 409,830 according to 2023 Census Bureau estimates. The median age is 39.6 years. The largest racial or ethnic group is White at 85.0% of the population. 29.3% of residents hold a bachelor's degree or higher. 4.3% of residents are foreign-born.