County · Missouri
St. Clair County, Missouri
St. Clair County, Missouri. St. Clair County had 9,976 residents in 2025 by the Census Bureau's estimate, up 7.4% since 2020, faster than Missouri (+1.9%). It holds 7 places (7 cities, villages and boroughs) and 3 census tracts. GEOID 29185.
Residents, July 2025 estimate
9,976
Census Bureau estimate (no margin published)
2020 Census count: 9,284 · ACS 2020-2024: 9,587
Median household income
$53,043
±$6,049 (90% margin)
Missouri: $70,702
Median home value
$157,100
±$9,713 (90% margin)
Missouri: $230,300
Median gross rent
$622
±$71 (90% margin)
Missouri: $1,033
How many people live in St. Clair County, and is it growing?
The 2020 Census counted 9,284 residents in St. Clair County. The Census Bureau estimates 9,976 for July 1, 2025, up 7.4% since 2020, faster than Missouri (+1.9%). The 2020-2024 American Community Survey puts the population at 9,587 over 675 square miles of land.
| Measure | St. Clair County | Missouri | Change since 2015-2019 |
|---|---|---|---|
| Total population | 9,587 | 6,191,814 | +217 |
| Households | 4,071±180 | 2,508,227 | no clear change |
| Average household size | 2.31±0.10 | 2.40 | no clear change |
| Housing units | 5,290±30 | 2,825,287 | −366 |
St. Clair County's population since 2000
From 9,652 in 2000 to 9,976 in 2025: up 3.4%. 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 7 places: 7 cities, villages and boroughs (incorporated places). The largest is Appleton City with 1,096 residents (2025 estimate). Places that cross a county line are listed with the share of their 2020 residents who live in this county.
| Appleton City | 1,032 | $49,036 |
|---|---|---|
| Osceola | 909 | $42,582 |
| Lowry City | 613 | $41,250 |
| CollinsGEOID 2915562 | 125 | $45,833 |
| RoscoeGEOID 2963074 | 89 | $43,611 |
| VistaGEOID 2976390 | 36 | $48,750 |
| GersterGEOID 2926902 | 21 | not published |
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 46.1 years old; 21.3% are under 18 and 25.6% are 65 or older. The largest group is non-Hispanic white residents at 92.8%, then non-Hispanic residents of two or more races at 3.8%. 1.2% of residents were born outside the United States.
| Measure | St. Clair County | Missouri | Change since 2015-2019 |
|---|---|---|---|
| Median age | 46.1±0.7 | 39.0 | −4.2 |
| Under 18 years | 21.3%±0.4 pts | 22.3% | – |
| 65 years and over | 25.6%±0.5 pts | 17.9% | – |
| Hispanic or Latino (any race) | 2.2% | 5.2% | +0.9 pts |
| White alone, not Hispanic | 92.8%±1.0 pts | 76.3% | −1.7 pts |
| Black or African American alone, not Hispanic | 0.8%±0.4 pts | 10.9% | no clear change |
| Asian alone, not Hispanic | 0.2%±0.2 pts | 2.1% | – |
| American Indian and Alaska Native alone, not Hispanic | 0.2%±0.1 pts | 0.2% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±0.4 pts | 0.1% | – |
| Two or more races, not Hispanic | 3.8%±1.1 pts | 4.8% | – |
| Some other race alone, not Hispanic | 0.0%±0.4 pts | 0.4% | – |
| Born outside the United States | 1.2%±0.6 pts | 4.5% | no clear change |
| Speak a language other than English at home (age 5+) | 2.4%±1.0 pts | 6.7% | – |
| Civilian veterans (age 18+) | 8.7%±1.8 pts | 7.3% | – |
| With a disability | 20.9%±2.0 pts | 14.9% | – |
| No health insurance coverage | 10.6%±2.0 pts | 8.8% | no clear change |
| High school graduate or higher (age 25+) | 86.0%±2.5 pts | 91.9% | – |
| Bachelor's degree or higher (age 25+) | 14.7%±2.5 pts | 32.4% | no clear change |
| Graduate or professional degree (age 25+) | 4.5%±0.9 pts | 12.6% | – |
| Moved from another state in the past year | 2.2%±1.5 pts | 2.5% | – |
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 4,071 households earn less than $53,043 a year (±$6,049), against $70,702 in Missouri. In 2015-2019 it was $47,837 in 2024 dollars; the margins of error cannot tell the two periods apart. 14.7% of residents live below the poverty line.
| Measure | St. Clair County | Missouri | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $53,043±$6,049 | $70,702 | no clear change |
| Mean household income | $69,413±$5,460 | $96,247 | – |
| Per capita income | $29,315±$2,055 | $39,695 | no clear change |
| People below the poverty line | 14.7%±2.6 pts | 12.6% | no clear change |
| Children under 18 below the poverty line | 15.0%±5.0 pts | 15.8% | no clear change |
| Households receiving SNAP | 13.5%±3.0 pts | 9.8% | – |
| Households with a broadband subscription | 82.4%±3.1 pts | 89.3% | – |
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 76.0% of St. Clair County's occupied homes and renters 24.0%. The median owner-occupied home is valued at $157,100 by its owner (±$9,713). The median renter pays $622 a month including utilities, and 31.0% of renters pay 35% or more of their income on rent.
| Measure | St. Clair County | Missouri | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $157,100±$9,713 | $230,300 | +$43,999 |
| Median gross rent | $622±$71 | $1,033 | no clear change |
| Renters paying 35% or more of income on rent | 31.0%±8.7 pts | 36.6% | no clear change |
| Median monthly owner costs, with a mortgage | $1,190±$129 | $1,524 | – |
| Owner-occupied homes | 76.0%±3.5 pts | 68.1% | no clear change |
| Housing units | 5,290±30 | 2,825,287 | −366 |
| Homeowner vacancy rate | 1.2%±1.2 pts | 0.9% | – |
| Rental vacancy rate | 1.1%±1.7 pts | 5.0% | – |
| Single-family detached homes | 73.5%±3.5 pts | 70.5% | – |
| Mobile homes | 19.7%±3.1 pts | 5.2% | – |
| Built 2020 or later | 2.5%±1.5 pts | 1.6% | – |
| Built 1939 or earlier | 13.8%±2.8 pts | 13.3% | – |
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 3 new housing units across St. Clair County in 2025 (3 single-family), 0.3 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?
75.5% of St. Clair County's workers drive alone and 8.8% work from home. The average trip to work takes 28.4 minutes. The unemployment rate in 2020-2024 averaged 3.3%.
| Measure | St. Clair County | Missouri | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 52.8%±2.9 pts | 63.1% | – |
| Unemployment rate | 3.3%±1.8 pts | 4.0% | no clear change |
| Drove alone to work | 75.5%±3.8 pts | 74.8% | – |
| Carpooled | 13.7%±3.6 pts | 8.1% | – |
| Public transportation | 0.2%±0.3 pts | 0.8% | – |
| Walked | 1.4%±0.9 pts | 1.8% | – |
| Worked from home | 8.8%±2.6 pts | 13.0% | no clear change |
| Mean travel time to work | 28.4 min±3.5 | 23.5 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 3 census tracts. Among those with a reliable estimate, median household income runs from $51,574 (Tract 4801) to $57,500 (Tract 4802).
| Tract 480129185480100 | 3,614±268 | $51,574 |
|---|---|---|
| Tract 480229185480200 | 2,803±246 | $57,500 |
| Tract 480329185480300 | 3,170±269 | $51,758 |
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 Missouri's other counties?
| Measure | Rank |
|---|---|
| Population | 88th of 115 |
| Growth 2020-2025 | 8th of 115 |
| Residents per square mile | 94th of 115 |
| Median household income | 88th of 115 |
| Median home value | 77th of 115 |
| Median gross rent | 105th of 115 |
| Poverty rate | 52nd of 115 |
| Bachelor's degree or higher | 99th of 115 |
| Median age | 12th of 115 |
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.