St. Clair County, Michigan Demographics 2026
St. Clair County, Michigan has a population of 160,221, the 13th most populous county in Michigan. The median household income is $71,270 and the median home value is $224,600. The poverty rate is 11.3%.
Data vintage: U.S. Census Bureau ACS 2020–2024 5-Year Estimates · refreshed July 2026 · Methodology & source notes
St. Clair County Quick Facts
How St. Clair County Changed
Change from the 2019–2023 ACS period to 2020–2024. These are rolling five-year estimates, not year-over-year measurements.
| Metric | 2019–2023 | 2020–2024 | Change |
|---|---|---|---|
| Population | 160,089 | 160,221 | +0.1% |
| Median household income | $69,349 | $71,270 | +2.8% |
| Median home value | $213,900 | $224,600 | +5.0% |
Median Household Income
Median Home Value
Economy & Housing
Household Income Distribution
Detailed income brackets
Employment
Housing Overview
People & Demographics
Age Distribution
Race & Ethnicity
Diversity Index
A less diverse community where one racial or ethnic group represents a large majority.
State average: 45 | National average: 61
Education
Educational Attainment (Adults 25+)
Cities & Places in St. Clair County
| City | Population | Median Income | Poverty | Home Value |
|---|---|---|---|---|
| Port Huron | 28,620 | $50,366 | 22.6% | $149,300 |
| Marysville | 9,925 | $66,901 | 6.4% | $208,600 |
| St. Clair | 5,585 | $69,688 | 7.1% | $223,200 |
| Pearl Beach | 4,506 | $83,208 | 10.0% | $301,700 |
| Algonac | 4,139 | $56,820 | 14.5% | $199,500 |
| Marine City | 4,028 | $67,683 | 7.6% | $159,800 |
| Yale | 2,129 | $53,236 | 18.0% | $127,100 |
| Capac | 1,970 | $60,329 | 12.5% | $161,700 |
| Lakeport | 742 | $54,236 | 17.3% | $206,400 |
| Ruby | 714 | $69,077 | 2.7% | $223,800 |
| Emmett | 207 | $120,074 | 1.9% | $145,800 |
Explore Michigan Rankings
Population Overview
St. Clair County is located in Michigan with a total population of 160,221. It is the 13th most populous county out of 83 in Michigan. The county encompasses 11 Census-designated places.
Age Demographics
The median age in St. Clair County is 44.5 years. This is 11% higher than the state median of 40.2 years.
Economy, Income & Housing
The median household income in St. Clair County is $71,270. This is 2% lower than the state median of $72,875. It is also 12% lower than the national median of $80,734. The poverty rate stands at 11.3%. This is 15% lower than the state poverty rate of 13.2%. The unemployment rate is 5.7%. The median home value is $224,600. Housing costs are 3% lower than the state median of $231,600. The home-value-to-income ratio is 3.2x. 80.8% of occupied housing units are owner-occupied. This homeownership rate is 10% higher than the state average of 73.2%.
Race & Ethnicity
St. Clair County has a predominantly White (non-Hispanic) population, comprising 89.7% of all residents. Hispanic or Latino residents account for 3.7%. The Black or African American population (2.1%) is well below the state average of 13.1%. The Asian population (0.5%) is well below the state average of 3.4%.
Education
20.3% of residents aged 25 and older hold a bachelor's degree or higher. This is 37% lower than the state rate of 32.5%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 92.0%.
Data Sources & Methodology
All figures for St. Clair County come from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates, with comparisons drawn against Michigan and national averages from the same dataset. See our methodology page for how each metric is defined, or data.census.gov for official tables with margins of error.
Frequently Asked Questions
What is the population of St. Clair County, Michigan?
St. Clair County has a population of 160,221, making it the 13th most populous county in Michigan.
What is the median income in St. Clair County?
The median household income in St. Clair County is $71,270 with a poverty rate of 11.3%.
How many cities are in St. Clair County, Michigan?
St. Clair County contains 11 Census-designated places.