St. Clair County's estimated 2025 population is 160,286 with a growth rate of 0.13% in the past year according to the most recent United States census data. St. Clair County is the 13th largest county in Michigan. The 2010 population was 162,688 and has seen a growth of -1.48% since that time.
Data after 2023 is projected based on recent change
The racial composition of St. Clair County includes 91.56% White, and smaller percentages for Black or African American, other race, Asian, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
White
Two or more races
Black or African American
Other race
Asian
Native American
Native Hawaiian or Pacific Islander
Race | Population | Percentage (of total) |
|---|---|---|
| White | 146,571 | 91.56% |
| Two or more races | 6,900 | 4.31% |
| Black or African American | 3,713 | 2.32% |
| Other race | 1,804 | 1.13% |
| Asian | 846 | 0.53% |
| Native American | 248 | 0.15% |
| Native Hawaiian or Pacific Islander | 7 | 0% |
Married
Widowed
Divorced
Separated
Never Married
St. Clair County's average per capita income is $46,163. Household income levels show a median of $69,349. The poverty rate stands at 10.99%.
Name | Median | Mean |
|---|---|---|
| Married Families | $97,567 | $116,886 |
| Families | $85,166 | $104,301 |
| Households | $69,349 | $88,904 |
| Non Families | $39,771 | $52,887 |
Average Income
Median Household Income
Poverty Rate