St. Clair Flag

St. Clair

County Seat:
No
Area (mi²):
20.364
State:
Illinois

St. Clair is located in St. Clair County, Illinois. St. Clair has a 2025 population of 35,370 . St. Clair is currently declining at a rate of -0.53% annually and its population has decreased by -0.9% since the most recent census, which recorded a population of 35,691 in 2020.

The average household income in St. Clair is $100,837 with a poverty rate of 10.97%. The median age in St. Clair is 40.9 years: 38.5 years for males, and 43.4 years for females. For every 100 females there are 97.3 males.

35.4K
Total Population
1,737
Density (mi²)
-190 -0.53%
Growth

St. Clair Population

St. Clair Population

Data after 2023 is projected based on recent change

Demographics

The racial composition of St. Clair includes 65.76% White, 23.93% Black or African American, and smaller percentages for Asian, other race, Native American and multiracial populations.

Population by Race

White (65.76%)

Black or African American (23.93%)

Two or more races (5.22%)

Asian (2.87%)

Other race (1.79%)

Native American (0.43%)

Race
Population
Percentage (of total)
White23,41265.76%
Black or African American8,51823.93%
Two or more races1,8595.22%
Asian1,0212.87%
Other race6381.79%
Native American1540.43%

St. Clair Marital Status

OverallMalesFemales0%10%20%30%40%50%60%70%80%90%100%

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

St. Clair's average per capita income is $51,236. Household income levels show a median of $76,643. The poverty rate stands at 10.97%.

Families: A family includes the owner or renter of the home along with everyone related to them - whether through birth, marriage, or adoption. This includes relatives like spouses, children, parents, siblings, grandparents, and any other family members.
Households: A household includes all the people who occupy a housing unit (such as a house or apartment) as their usual place of residence.
Non Families: A nonfamily household is either someone living alone or when the owner/renter lives with people they aren't related to, like roommates.
Name
Median
Mean
Married Families$125,183-
Families$108,474$129,681
Households$76,643$100,837
Non Families$42,108$53,034

$51,236

Average Income

$76,643

Median Household Income

10.97%

Poverty Rate

Nearby Cities

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)