St. Charles County's estimated 2026 population is 430,408 with a growth rate of 0.92% 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 18.96% since that time.
Data after 2023 is projected based on recent change
Overall: 39.8 years
Female: 40.8 years
Male: 38.8 years
There are 321,155 adults, (70,408 of whom are seniors) in St. Charles County.
Female: 209,458 (50.5%)
Male: 205,077 (49.5%)
The racial composition of St. Charles County includes 84.03% White, 5.15% Black or African American, 3.05% Asian, and smaller percentages for other race, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 348,354 | 84.03% |
| Two or more races | 26,513 | 6.4% |
| Black or African American | 21,335 | 5.15% |
| Asian | 12,632 | 3.05% |
| Other race | 5,181 | 1.25% |
| Native American | 333 | 0.08% |
| Native Hawaiian or Pacific Islander | 187 | 0.05% |
St. Charles County's average per capita income is $62,951. Household income levels show a median of $104,692. The poverty rate stands at 5.2%.
Name | Median | Mean |
|---|---|---|
| Married Families | $139,375 | $163,152 |
| Families | $126,505 | $149,775 |
| Households | $104,692 | $129,305 |
| Non Families | $57,044 | $77,440 |
Average Income
Median Household Income
Poverty Rate