St. Charles County's estimated 2025 population is 422,381 with a growth rate of 0.68% in the past year according to the most recent United States census data. St. Charles County is the 3rd largest county in Missouri. The 2010 population was 361,808 and has seen a growth of 16.74% since that time.
Data after 2023 is projected based on recent change
The racial composition of St. Charles County includes 85.05% White, 5.05% Black or African American, and smaller percentages for Asian, other race, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
White
Two or more races
Black or African American
Asian
Other race
Native American
Native Hawaiian or Pacific Islander
Race | Population | Percentage (of total) |
|---|---|---|
| White | 348,543 | 85.05% |
| Two or more races | 23,436 | 5.72% |
| Black or African American | 20,698 | 5.05% |
| Asian | 11,785 | 2.88% |
| Other race | 4,853 | 1.18% |
| Native American | 336 | 0.08% |
| Native Hawaiian or Pacific Islander | 179 | 0.04% |
Married
Widowed
Divorced
Separated
Never Married
St. Charles County's average per capita income is $61,515. Household income levels show a median of $102,912. The poverty rate stands at 4.7%.
Name | Median | Mean |
|---|---|---|
| Married Families | $135,683 | $159,013 |
| Families | $122,939 | $146,561 |
| Households | $102,912 | $127,112 |
| Non Families | $56,564 | $76,215 |
Average Income
Median Household Income
Poverty Rate