St. Clair County's estimated 2025 population is 10,066 with a growth rate of 1.58% in the past year according to the most recent United States census data. St. Clair County is the 84th largest county in Missouri. The 2010 population was 9,823 and has seen a growth of 2.47% since that time.
Data after 2023 is projected based on recent change
The racial composition of St. Clair County includes 93.56% White, and smaller percentages for other race, Black or African American, Asian, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
White
Two or more races
Other race
Black or African American
Asian
Native American
Native Hawaiian or Pacific Islander
Race | Population | Percentage (of total) |
|---|---|---|
| White | 8,842 | 93.56% |
| Two or more races | 426 | 4.51% |
| Other race | 75 | 0.79% |
| Black or African American | 74 | 0.78% |
| Asian | 23 | 0.24% |
| Native American | 11 | 0.12% |
| Native Hawaiian or Pacific Islander | 0 | 0% |
Married
Widowed
Divorced
Separated
Never Married
St. Clair County's average per capita income is $33,801. Household income levels show a median of $46,731. The poverty rate stands at 16.28%.
Name | Median | Mean |
|---|---|---|
| Married Families | $67,451 | - |
| Families | $61,803 | $74,132 |
| Households | $46,731 | $60,329 |
| Non Families | $30,722 | $38,339 |
Average Income
Median Household Income
Poverty Rate
