St. Clair County's estimated 2026 population is 160,364 with a growth rate of 0.02% in the past year according to the most recent United States census data. St. Clair County is the 14th largest county in Michigan. The 2010 population was 162,688 and has seen a growth of -1.43% 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 (91.56%)
Two or more races (4.31%)
Black or African American (2.32%)
Other race (1.13%)
Asian (0.53%)
Native American (0.15%)
Native Hawaiian or Pacific Islander (0%)
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