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 distinguished by its share of foreign-born residents, 9.9% of the population. With 160,089 residents, St. Clair County is a county in Michigan. It ranks #14 among counties in Michigan by population.
Median household income is $69,349, below the US median of $78,538. About 7.9% of residents live below the federal poverty level, below the national 12.4%. Homes carry a median value of $213,900, with typical rent around $999.
20.3% of adults 25 and older hold a bachelor’s degree, below the national average of 35.0%. Remote work is below the national 14.0% at 7.1%, and the average commute runs about 29 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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Part of Michigan
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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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Statewide data for Michigan
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.