St. Charles County's estimated 2026 population is 435,262 with a growth rate of 1.34% 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 20.3% 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 (85.05%)
Two or more races (5.72%)
Black or African American (5.05%)
Asian (2.88%)
Other race (1.18%)
Native American (0.08%)
Native Hawaiian or Pacific Islander (0.04%)
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