Statistic O'Fallon Illinois National
Population 29,487 12,671,821 328,239,523
Population density (sq mi) 1,891 228 91
Median age 37.7 37.4 37.7
Male/Female ratio 0.9:1 1.0:1 1.0:1
Married (15yrs & older) 67% 55% 55%
Families w/ Kids under 18 45% 44% 43%
Speak English 92% 77% 79%
Speak Spanish 3% 13% 13%
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Demographics Quick Facts

  • The population density in O'Fallon is 729% higher than Illinois
  • The median age in O'Fallon is 1% higher than Illinois
  • In O'Fallon 79.11% of the population is White
  • In O'Fallon 10.16% of the population is Black
  • In O'Fallon 3.77% of the population is Asian

Compare O'Fallon, IL Demographics

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      O'Fallon population breakdown by race

      Race O'Fallon Illinois National
      White 79.11% 72.14% 73.35%
      Black 10.16% 14.30% 12.63%
      Asian 3.77% 5.10% 5.22%
      American Indian 0.07% 0.23% 0.82%
      Native Hawaiian 0.00% 0.03% 0.18%
      Mixed race 5.12% 2.34% 3.06%
      Other race 1.77% 5.86% 4.75%
      In O'Fallon, 4.9% 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.

      Household income distribution

      Place of birth by citizenship

      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 United States Census Bureau American Community Survey (ACS).