O'Fallon is a city located in St. Clair County, Illinois. O'Fallon has a 2025 population of 31,742. O'Fallon is currently declining at a rate of -0.35% annually and its population has decreased by -1.75% since the most recent census, which recorded a population of 32,307 in 2020.
The average household income in O'Fallon is $131,945 with a poverty rate of 4.39%.The median age in O'Fallon is 36.9 years: 35.1 years for males, and 38.2 years for females.
Data after 2023 is projected based on recent change
The racial composition of O'Fallon includes 72.62% White, 13.61% Black or African American, and smaller percentages for Asian, other race, Native American and multiracial populations.
Race | Population | Percentage (of total) |
---|---|---|
White | 23,340 | 72.62% |
Black or African American | 4,375 | 13.61% |
Two or more races | 2,990 | 9.3% |
Asian | 928 | 2.89% |
Other race | 483 | 1.5% |
Native American | 23 | 0.07% |
Married
Widowed
Divorced
Separated
Never Married
O'Fallon's average per capita income is $64,936. Household income levels show a median of $102,793. The poverty rate stands at 4.39%.
Name | Median | Mean |
---|---|---|
Married Families | $146,065 | - |
Families | $126,776 | $155,518 |
Households | $102,793 | $131,945 |
Non Families | $50,481 | $62,451 |
Average Income
Median Household Income
Poverty Rate