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St. Clair County, Michigan Demographics 2026

St. Clair County, Michigan has a population of 160,089, the 14th most populous county in Michigan. The median household income is $69,349 and the median home value is $213,900. The poverty rate is 11.0%.

St. Clair County Quick Facts

Population 160,089
Median Household Income $69,349
Median Home Value $213,900
Poverty Rate 11.0%
Unemployment Rate 6.4%
Median Age 44.3 years
Homeownership Rate 80.5%
Affordability Ratio 3.1x
Bachelor's Degree+ 20.3%
High School Graduation 92.1%
Cities/Places 8
Population 160,089 14th of 83
Median Income $69,349 3% lower state
Poverty Rate 11.0%
Unemployment 6.4%

Economy & Housing

Employment

6.4% Unemployment Rate State: 5.8% | National: 5.2%
60.4% Labor Force Participation

Housing Overview

Owner 80.5%
Renter 19.5%
Affordability Index Affordable
3.1x home value to income ratio

People & Demographics

Diversity Index

19out of 100
Very Low Diversity

A less diverse community where one racial or ethnic group represents a large majority.

State average: 44 | National average: 60

Education

Cities & Places in St. Clair County

CityPopulationMedian IncomePovertyHome Value
Port Huron city28,724$49,37722.1%$136,000
Marysville city9,942$69,6616.2%$185,500
Richmond city5,839$61,71523.4%$228,000
St. Clair city5,581$68,4829.6%$241,700
Algonac city4,152$49,73817.7%$177,200
Marine City city4,047$63,1567.4%$146,500
Yale city2,157$50,67321.5%$112,100
Memphis city1,107$60,88423.3%$190,400

Explore Michigan Rankings

Cities by Population All cities ranked by size Richest Cities Ranked by median income Most Educated By bachelor's degree rate Most Affordable By housing affordability

Population Overview

St. Clair County is located in Michigan with a total population of 160,089. It is the 14th most populous county out of 83 in Michigan. The county encompasses 8 Census-designated places.

Age Demographics

The median age in St. Clair County is 44.3 years. This is 10% higher than the state median of 40.1 years.

Economy, Income & Housing

The median household income in St. Clair County is $69,349. This is 3% lower than the state median of $71,149. Compared to the national median of $78,538, household income here is 12% lower. The poverty rate stands at 11.0%. This is 16% lower than the state poverty rate of 13.1%. The unemployment rate is 6.4%. This is 10% higher than the state rate of 5.8%. The median home value is $213,900. Housing costs are 2% lower than the state median of $217,600. The home-value-to-income ratio is 3.1x. 80.5% of occupied housing units are owner-occupied. This homeownership rate is 10% higher than the state average of 72.9%.

Race & Ethnicity

St. Clair County has a predominantly White (non-Hispanic) population, comprising 90.0% of all residents. Hispanic or Latino residents account for 3.6%. The Black or African American population (2.2%) is well below the state average of 13.2%. The Asian population (0.5%) is well below the state average of 3.3%.

Education

20.3% of residents aged 25 and older hold a bachelor's degree or higher. This is 36% lower than the state rate of 31.8%. Nationally, 35.0% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 92.1%.

Frequently Asked Questions

What is the population of St. Clair County, Michigan?

St. Clair County has a population of 160,089, making it the 14th most populous county in Michigan.

What is the median income in St. Clair County?

The median household income in St. Clair County is $69,349 with a poverty rate of 11.0%.

How many cities are in St. Clair County, Michigan?

St. Clair County contains 8 Census-designated places.