O'Fallon township Flag

O'Fallon township

County Seat:
No
Area (mi²):
35.11
State:
Illinois

O'Fallon township is located in St. Clair County, Illinois. O'Fallon township has a 2026 population of 26,608. O'Fallon township is currently declining at a rate of -0.11% annually and its population has decreased by -1.22% since the most recent census, which recorded a population of 26,937 in 2020.

The median household income in O'Fallon township is $100,136 with a poverty rate of 7.41%. The median age in O'Fallon township is 39.1 years: 37.7 years for males, and 40.3 years for females. For every 100 females there are 97.8 males.

26.6K
Total Population
758
Density (mi²)
-29 -0.11%
Growth

O'Fallon township Population

O'Fallon township Population

Data after 2023 is projected based on recent change

Year ↓
Population
Growth
Annual Change
202626,608-29-0.11%
202526,637-29-0.11%
202426,666-29-0.11%
202326,695-70-0.26%
202226,765-132-0.49%
202126,897-40-0.15%
202026,937-24-0.09%
201926,569-13-0.05%
201826,5821660.63%
201726,4161190.45%
201626,297370.14%
201526,260-36-0.14%
201426,296-66-0.25%
201326,362-109-0.41%
201226,471-102-0.38%
201126,5735202%
201026,098330.13%

Median Age

Overall: 39.1 years
Female: 40.3 years
Male: 37.7 years

O'Fallon township Adults

There are 20,437 adults, (5,069 of whom are seniors) in O'Fallon township.

Sex Ratio

Female: 13,540 (50.6%)
Male: 13,245 (49.4%)

Demographics

The racial composition of O'Fallon township includes 69.71% White, 15.89% Black or African American, and smaller percentages for Asian, other race, Native American and multiracial populations.

Population by Race

Race
Population ↓
Percentage (of total)
White18,67269.71%
Black or African American4,25615.89%
Two or more races2,73310.2%
Asian7102.65%
Other race3891.45%
Native American250.09%
Race
Population ↓
Percentage (of total)
Two or more races9253.45%
Other race3341.25%
White2751.03%
Black or African American1330.5%
Asian130.05%
Race
Population ↓
Percentage (of total)
White18,39768.68%
Black or African American4,12315.39%
Two or more races1,8086.75%
Asian6972.6%
Other race550.21%
Native American250.09%

O'Fallon township Marital Status

Economics and Income Statistics

O'Fallon township 's average per capita income is $60,673. Household income levels show a median of $100,136. The poverty rate stands at 7.41%.

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$146,741-
Families$126,918$153,946
Households$100,136$129,197
Non Families$53,636$64,840

$60,673

Average Income

$100,136

Median Household Income

7.41%

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)