O'Fallon Flag

O'Fallon

County Seat:
No
Area (mi²):
30.989
State:
Missouri

O'Fallon is a city located in St. Charles County, Missouri. O'Fallon has a 2026 population of 97,200. O'Fallon is currently growing at a rate of 0.96% annually and its population has increased by 6.04% since the most recent census, which recorded a population of 91,665 in 2020.

The median household income in O'Fallon is $110,443 with a poverty rate of 5.38%. The median age in O'Fallon is 38.4 years: 37.8 years for males, and 39.2 years for females. For every 100 females there are 95.3 males.

97.2K
Total Population
3,137
Density (mi²)
923 0.96%
Growth

O'Fallon Population

O'Fallon Population

Data after 2023 is projected based on recent change

Year ↓
Population
Growth
Annual Change
202697,2009230.96%
202596,2779220.97%
202495,3559370.99%
202394,4186650.71%
202293,75360.01%
202193,7472,3722.6%
202091,6653,0703.47%
201988,5952450.28%
201888,3508120.93%
201787,5381,0391.2%
201686,4991,4001.65%
201585,0998461%
201484,2531,0911.31%
201383,1621,0051.22%
201282,1579601.18%
201181,1971,2281.54%
201079,9696400.81%
200046,16927,471146.92%
199018,69810,021115.49%
19808,6771,65923.64%
19707,0183,24886.15%
19603,7703,170528.33%
194060000%

Median Age

Overall: 38.4 years
Female: 39.2 years
Male: 37.8 years

O'Fallon Adults

There are 71,125 adults, (13,569 of whom are seniors) in O'Fallon.

Sex Ratio

Female: 48,041 (51.2%)
Male: 45,760 (48.8%)

Demographics

The racial composition of O'Fallon includes 80.97% White, 5.27% Black or African American, 4.88% Asian, and smaller percentages for other race, Native American, Native Hawaiian or Pacific Islander and multiracial populations.

Population by Race

Race
Population ↓
Percentage (of total)
White75,94980.97%
Two or more races6,9187.38%
Black or African American4,9425.27%
Asian4,5794.88%
Other race1,3121.4%
Native American610.07%
Native Hawaiian or Pacific Islander400.04%
Race
Population ↓
Percentage (of total)
Two or more races2,8783.07%
White1,3851.48%
Other race8150.87%
Asian530.06%
Black or African American340.04%
Native Hawaiian or Pacific Islander260.03%
Native American90.01%
Race
Population ↓
Percentage (of total)
White74,56479.49%
Black or African American4,9085.23%
Asian4,5264.83%
Two or more races4,0404.31%
Other race4970.53%
Native American520.06%
Native Hawaiian or Pacific Islander140.01%

O'Fallon Marital Status

Economics and Income Statistics

O'Fallon 's average per capita income is $66,095. Household income levels show a median of $110,443. The poverty rate stands at 5.38%.

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$143,448-
Families$131,577$146,653
Households$110,443$128,022
Non Families$59,991$75,999

$66,095

Average Income

$110,443

Median Household Income

5.38%

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)