O'Fallon demographics profile

StatisticO'FallonIllinoisNational
Population29,07812,851,684318,558,162
Population density (sq mi)1,90022291
Median age36.837.437.7
Male/Female ratio1.0:11.0:11.0:1
Married (15yrs & older)61%55%55%
Families w/ Kids under 1850%44%43%
Speak English94%77%79%
Speak Spanish2%13%13%
O'Fallon, IL has a population of 29,078 and is the 1,471st largest city in the United States. The population density is 1,900 per sq mi which is 755% higher than the Illinois average and 1997% higher than the national average. The median age in O'Fallon is 37 which is approximately 2% lower than the Illinois average of 37. In O'Fallon, 61% of the population over 15 years of age are married, 94% speak English and 2% speak Spanish. 47% of O'Fallon residents were born in Illinois, 46% were born out of state, 3% were born outside of the United States and 4% were foreign born.
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Did you know?

  • The population density in O'Fallon is 755% higher than Illinois.
  • The median age in O'Fallon is 2% lower than Illinois.
  • In O'Fallon 78.46% of the population is White.
  • In O'Fallon 13.94% of the population is Black or African American.
  • In O'Fallon 3.01% of the population is Asian.

Compare O'Fallon, IL Demographics To Other Cities

O'Fallon population breakdown by race

RaceO'FallonIllinoisNational
White78.46%72.14%73.35%
Black or African American13.94%14.30%12.63%
Asian3.01%5.10%5.22%
American Indian0.09%0.23%0.82%
Native Hawaiian0.00%0.03%0.18%
Mixed race3.55%2.34%3.06%
Other race0.95%5.86%4.75%
In O'Fallon, 3.8% of people are of Hispanic or Latino origin.
Please note: Hispanics may be of any race, so also are included in any/all of the applicable race categories above.

Languages spoken

Place of birth by citizenship

Household income distribution

Source of income

O'Fallon age breakdown

Marital status

Age of children in married couples

Source: The O'Fallon, IL demographics data displayed above is derived from the 2016 United States Census Bureau American Community Survey (ACS).
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