St. Clair County, Michigan Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 14th-largest in Michigan
The population of St. Clair County, Michigan is 160,089 as of the 2023 American Community Survey, making it the 14th-largest county in Michigan. The median household income is $69,349, the median home value is $213,900, and the median age is 44.3.
The population of St. Clair County has declined 1.5% since 2010 (162,688 → 160,308), a -0.11% annualized rate.
160,089
Population
-0.11%
Annual growth
222
People / sq mi
$69,349
Median Income
$213,900
Median Home Value
St. Clair County covers 722 sq mi of land at 221.9 people per square mile.
About St. Clair County, MI
St. Clair County is a county in Michigan with a population of 160,089. It ranks #14 among counties in Michigan by population. The median age is 44.3, older than the national median. The population is 50.0% male and 50.0% female.
The median household income in St. Clair County is $69,349, below the US median of $74,580. 7.9% of residents live below the federal poverty level. Home values sit at a median of $213,900, with monthly rent averaging $999. The homeownership rate of 80.5% is higher than the national rate of 64.8%.
Educational attainment in St. Clair County reflects 20.3% of adults 25 and older holding a bachelor's degree or higher, below the national average of 34.3%. Roughly 7.1% of workers primarily work from home, below the national work-from-home rate of 14.2%. The average commute is 28.7 minutes each way.
St. Clair County Population History (2010-2024)
The county of St. Clair County had a population of 162,688 in 2010 and 160,308 in 2024, a -1.5% growth over 14 years. The peak was 162,688 in 2010. Average annual growth rate: -0.10%.
160,308
Population (2024)
162,688
Population (2010)
162,688
Peak (2010)
-0.10%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 162,688 |
| 2011 | 161,586 |
| 2012 | 160,637 |
| 2013 | 160,312 |
| 2014 | 160,103 |
| 2015 | 159,757 |
| 2016 | 159,477 |
| 2017 | 159,130 |
| 2018 | 159,186 |
| 2019 | 159,339 |
| 2020 | 160,394 |
| 2021 | 160,243 |
| 2022 | 159,882 |
| 2023 | 160,280 |
| 2024 | 160,308 |
Race & Ethnicity
| White | 91.6% |
| Black or African American | 2.3% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 1.3% |
| Two or More Races | 0.0% |
Age & Sex
44.3
Median Age
50.0%
Female
50.0%
Male
19.8%
Age 65+
Age Distribution
Children (under 15): 16.5% · Seniors (65+): 19.8%
Income & Poverty
| Median household income | $69,349$-1,800 vs state |
| Mean household income | $88,904 |
| Per-capita income | $37,100 |
| Poverty rate | 7.9%-0.9% vs state |
| Unemployment rate | 3.9% |
| Employment-to-population | 56.5% |
Top Industries by Employment
The largest employment sector in St. Clair County is professional & business services, accounting for 21.1% of workers.
How residents commute
0.8%
Drive alone
1.3%
Carpool
80.5%
Public transit
7.1%
Work from home
28.7 min
Avg commute
Housing
$213,900$-3,700 vs state
Median home value
$999
Median rent
80.5%
Homeownership rate
72,467
Total housing units
91.9%
Occupied
8.1%
Vacant
19.5%
Renter-occupied
Social & access
95.2%
With health insurance
94.0%
With broadband internet
9.9%
Foreign-born
7.1%
Veterans (18+)
16.6%
With a disability
97.4%
Speak language other than English at home
Education
92.1%
High School+
20.3%
Bachelor's+
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County rankings
Frequently Asked Questions
St. Clair County, Michigan has a population of 160,089 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 14th-largest county in Michigan. Population density is 222 people per square mile.
The population of St. Clair County has declined 1.5% since 2010 (162,688 → 160,308), a -0.11% annualized rate.
The median household income in St. Clair County, Michigan is $69,349, with mean (average) household income of $88,904 and per-capita income of $37,100. 7.9% of residents live below the federal poverty level.
In St. Clair County, the largest racial and ethnic groups are White (91.6%), Black or African American (2.3%), Hispanic or Latino (1.3%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in St. Clair County, Michigan is 44.3 years. Residents are 50.0% female and 50.0% male.
The median home value in St. Clair County is $213,900 and median monthly rent is $999. 80.5% of occupied housing units are owner-occupied. The county has 72,467 total housing units, 8.1% of which are vacant.
The largest employment sector in St. Clair County, Michigan is professional, scientific, and management services, employing 21.1% of workers. The unemployment rate is 3.9%.
Detroit is among the largest cities associated with St. Clair County, Michigan, with a population of 636,644.
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Population, race, income, age, and trends across Michigan
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.