County · Michigan
St. Clair County, Michigan
St. Clair County, Michigan. St. Clair County had 160,486 residents in 2025 by the Census Bureau's estimate, up 0.1% since 2020, in line with Michigan (+0.5%). It holds 36 places (10 cities, villages and boroughs, 23 towns and townships and 3 census-designated) and 51 census tracts. GEOID 26147.
St. Clair County is one of the 6 counties of the Detroit-Warren-Dearborn, MI metropolitan statistical area (the Census Bureau's July 2023 delineation).
Residents, July 2025 estimate
160,486
Census Bureau estimate (no margin published)
2020 Census count: 160,383 · ACS 2020-2024: 160,221
Median household income
$71,270
±$1,351 (90% margin)
Michigan: $72,875
Median home value
$224,600
±$3,575 (90% margin)
Michigan: $231,600
Median gross rent
$1,029
±$25 (90% margin)
Michigan: $1,129
How many people live in St. Clair County, and is it growing?
The 2020 Census counted 160,383 residents in St. Clair County. The Census Bureau estimates 160,486 for July 1, 2025, up 0.1% since 2020, in line with Michigan (+0.5%). The 2020-2024 American Community Survey puts the population at 160,221 over 722 square miles of land.
| Measure | St. Clair County | Michigan | Change since 2015-2019 |
|---|---|---|---|
| Total population | 160,221 | 10,077,761 | +974 |
| Households | 67,816±583 | 4,076,369 | +2,966 |
| Average household size | 2.34±0.02 | 2.42 | −0.09 |
| Housing units | 72,799±121 | 4,622,236 | +620 |
St. Clair County's population since 2000
From 164,235 in 2000 to 160,486 in 2025: down 2.3%. The 2000, 2010 and 2020 figures are census counts. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); PEP Vintage 2025 (CO-EST2025); 2020 Census · Check it at data.census.gov
What cities and towns are in St. Clair County?
St. Clair County holds 36 places: 10 cities, villages and boroughs (incorporated places), 23 towns and townships (county subdivisions with their own government) and 3 census-designated places. The largest is Port Huron with 28,273 residents (2025 estimate). Places that cross a county line are listed with the share of their 2020 residents who live in this county.
| Port Huron | 28,983 | $50,366 |
|---|---|---|
| Fort Gratiot Charter Township | 11,242 | $87,165 |
| Port Huron Charter Township | 10,792 | $61,983 |
| Marysville | 9,997 | $66,901 |
| Kimball Township | 9,609 | $71,047 |
| Clay Township | 8,446 | $87,292 |
| St. Clair Township | 7,085 | $93,068 |
| Clyde Township, St. Clair County | 5,523 | $84,028 |
| St. Clair | 5,464 | $69,688 |
| Ira Township | 4,967 | $70,469 |
| Pearl Beach | 4,698 | $83,208 |
| Mussey Township | 4,234 | $66,350 |
| Algonac | 4,196 | $56,820 |
| Columbus Township, St. Clair County | 4,112 | $93,844 |
| Marine City | 4,079 | $67,683 |
| Burtchville Township | 4,077 | $58,872 |
| Casco Township, St. Clair County | 3,990 | $87,538 |
| East China Township | 3,704 | $71,517 |
| China Township | 3,509 | $98,879 |
| Cottrellville Township | 3,406 | $91,897 |
| Riley Township, St. Clair County | 3,199 | $97,262 |
| Wales Township | 3,180 | $90,417 |
| Berlin Township, St. Clair County | 3,115 | $93,948 |
| Emmett Township | 2,515 | $96,809 |
| Kenockee Township | 2,405 | $61,750 |
| Capac | 1,983 | $60,329 |
| Yale | 1,903 | $53,236 |
| Brockway Township | 1,897 | $81,813 |
| Grant Township, St. Clair County | 1,829 | $86,818 |
| Greenwood Township, St. Clair County | 1,490 | $82,656 |
| Lynn Township | 1,117 | $72,500 |
| RubyGEOID 2670160 | 852 | $69,077 |
| Lakeport | 720 | $54,236 |
| Memphis | 1,084 | $57,222 |
| EmmettGEOID 2625940 | 258 | $120,074 |
| Richmond | 5,878 | $64,719 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 place-by-county parts · Check it at data.census.gov
Who lives in St. Clair County?
The median resident of St. Clair County is 44.5 years old; 20.3% are under 18 and 20.4% are 65 or older. The largest group is non-Hispanic white residents at 89.7%, then Hispanic or Latino residents (of any race) at 3.7%. 2.0% of residents were born outside the United States.
| Measure | St. Clair County | Michigan | Change since 2015-2019 |
|---|---|---|---|
| Median age | 44.5±0.2 | 40.2 | +0.7 |
| Under 18 years | 20.3% | 21.2% | – |
| 65 years and over | 20.4%±0.1 pts | 18.6% | – |
| Hispanic or Latino (any race) | 3.7% | 5.9% | +0.3 pts |
| White alone, not Hispanic | 89.7%±0.2 pts | 72.4% | −1.4 pts |
| Black or African American alone, not Hispanic | 2.1%±0.2 pts | 13.1% | no clear change |
| Asian alone, not Hispanic | 0.5%±0.1 pts | 3.4% | no clear change |
| American Indian and Alaska Native alone, not Hispanic | 0.1%±0.1 pts | 0.3% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±0.1 pts | 0.0% | – |
| Two or more races, not Hispanic | 3.6%±0.3 pts | 4.5% | – |
| Some other race alone, not Hispanic | 0.3%±0.2 pts | 0.5% | – |
| Born outside the United States | 2.0%±0.2 pts | 7.2% | −0.5 pts |
| Speak a language other than English at home (age 5+) | 2.5%±0.3 pts | 10.4% | – |
| Civilian veterans (age 18+) | 7.1%±0.4 pts | 5.8% | – |
| With a disability | 16.9%±0.6 pts | 14.3% | – |
| No health insurance coverage | 4.9%±0.7 pts | 4.9% | no clear change |
| High school graduate or higher (age 25+) | 92.0%±0.5 pts | 92.1% | – |
| Bachelor's degree or higher (age 25+) | 20.3%±0.9 pts | 32.4% | +1.7 pts |
| Graduate or professional degree (age 25+) | 7.5%±0.6 pts | 12.7% | – |
| Moved from another state in the past year | 0.7%±0.2 pts | 1.4% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in St. Clair County earn?
Half of St. Clair County's 67,816 households earn less than $71,270 a year (±$1,351), against $72,875 in Michigan. In 2015-2019 it was $70,089 in 2024 dollars; the margins of error cannot tell the two periods apart. 11.3% of residents live below the poverty line.
| Measure | St. Clair County | Michigan | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $71,270±$1,351 | $72,875 | no clear change |
| Mean household income | $90,649±$2,647 | $98,700 | – |
| Per capita income | $38,214±$1,024 | $40,735 | no clear change |
| People below the poverty line | 11.3%±0.9 pts | 13.2% | −1.4 pts |
| Children under 18 below the poverty line | 15.7%±2.2 pts | 17.6% | −3.1 pts |
| Households receiving SNAP | 13.3%±1.0 pts | 13.5% | – |
| Households with a broadband subscription | 90.9%±0.7 pts | 90.5% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in St. Clair County?
Owners occupy 80.8% of St. Clair County's occupied homes and renters 19.2%. The median owner-occupied home is valued at $224,600 by its owner (±$3,575). The median renter pays $1,029 a month including utilities, and 44.7% of renters pay 35% or more of their income on rent.
| Measure | St. Clair County | Michigan | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $224,600±$3,575 | $231,600 | +$34,704 |
| Median gross rent | $1,029±$25 | $1,129 | no clear change |
| Renters paying 35% or more of income on rent | 44.7%±3.5 pts | 41.4% | +4.9 pts |
| Median monthly owner costs, with a mortgage | $1,469±$24 | $1,569 | – |
| Owner-occupied homes | 80.8%±1.2 pts | 73.2% | +3.5 pts |
| Housing units | 72,799±121 | 4,622,236 | +620 |
| Homeowner vacancy rate | 0.5%±0.2 pts | 0.8% | – |
| Rental vacancy rate | 3.5%±1.4 pts | 5.1% | – |
| Single-family detached homes | 79.1%±1.0 pts | 72.0% | – |
| Mobile homes | 6.5%±0.6 pts | 5.0% | – |
| Built 2020 or later | 1.0%±0.3 pts | 1.0% | – |
| Built 1939 or earlier | 17.0%±0.8 pts | 14.6% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How many new homes is St. Clair County building?
Builders took permits for 219 new housing units across St. Clair County in 2025 (219 single-family), 1.4 per 1,000 residents.
Source: Building Permits Survey, annual county files 2019-2025, U.S. Census Bureau · Census Building Permits Survey
How do people in St. Clair County get to work?
79.9% of St. Clair County's workers drive alone and 7.7% work from home. The average trip to work takes 28.5 minutes. The unemployment rate in 2020-2024 averaged 5.7%.
| Measure | St. Clair County | Michigan | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 60.8%±0.8 pts | 61.3% | – |
| Unemployment rate | 5.7%±0.7 pts | 5.7% | no clear change |
| Drove alone to work | 79.9%±1.2 pts | 74.3% | – |
| Carpooled | 8.8%±0.9 pts | 7.9% | – |
| Public transportation | 1.1%±0.3 pts | 0.9% | – |
| Walked | 1.1%±0.3 pts | 2.0% | – |
| Worked from home | 7.7%±0.7 pts | 13.5% | +4.8 pts |
| Mean travel time to work | 28.5 min±0.7 | 24.2 min | no clear change |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What are St. Clair County's census tracts?
St. Clair County is divided into 51 census tracts. Among those with a reliable estimate, median household income runs from $20,000 (Tract 6240) to $108,885 (Tract 6480).
All 51 census tracts of St. Clair County, with their figures
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · Check it at data.census.gov
How does St. Clair County compare with Michigan's other counties?
| Measure | Rank |
|---|---|
| Population | 13th of 83 |
| Growth 2020-2025 | 56th of 83 |
| Residents per square mile | 17th of 83 |
| Median household income | 22nd of 83 |
| Median home value | 19th of 83 |
| Median gross rent | 17th of 83 |
| Poverty rate | 59th of 83 |
| Bachelor's degree or higher | 55th of 83 |
| Median age | 39th of 83 |
Source: PlainCities ranks from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for St. Clair County are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' school search.