O'Fallon city, Illinois demographics
Population: 31,963
Median age: 37.6
Median household income: 96,698
O'Fallon is a city in St. Clair County, Illinois, United States.
Demographics, population, home values, social and economic characteristics of O'Fallon city, IL.
Population
| 2021 | 31,963 |
| 2020 | 29,487 |
| 2019 | 29,333 |
| 2018 | 29,277 |
| 2017 | 29,095 |
| 2016 | 29,078 |
| 2015 | 29,144 |
| 2014 | 29,100 |
| 2013 | 28,844 |
| 2012 | 28,377 |
| 2011 | 27,566 |
| 2010 | 27,044 |
| 2009 | 26,710 |
Census data for O'Fallon city, Illinois
Demographic and housing estimates in O'Fallon city, Illinois
| Total population | 31,963 |
| Male | 15,373 |
| Female | 16,590 |
| Total population | 31,963 |
| Under 5 years | 2,640 |
| 5 to 9 years | 2,406 |
| 10 to 14 years | 2,475 |
| 15 to 19 years | 1,972 |
| 20 to 24 years | 1,238 |
| 25 to 34 years | 4,134 |
| 35 to 44 years | 4,598 |
| 45 to 54 years | 4,454 |
| 55 to 59 years | 1,542 |
| 60 to 64 years | 1,727 |
| 65 to 74 years | 2,505 |
| 75 to 84 years | 1,496 |
| 85 years and over | 776 |
| Median age (years) | 37.6 |
| Under 18 years | 8,927 |
| 16 years and over | 23,823 |
| 18 years and over | 23,036 |
| 21 years and over | 22,310 |
| 62 years and over | 5,512 |
| 65 years and over | 4,777 |
| Total population | 31,963 |
| One race | 29,494 |
| White | 23,745 |
| Black or African American | 4,218 |
| American Indian and Alaska Native | 1 |
| Asian | 1,245 |
| Native Hawaiian and Other Pacific Islander | 0 |
| Some other race | 285 |
| Two or more races | 2,469 |
| Citizen, VOTING AGE 18 and over population | 22,607 |
| Male Citizen, VOTING AGE 18 and over population | 10,978 |
| Female Citizen, VOTING AGE 18 and over population | 11,629 |
Social characteristics in O'Fallon city, Illinois
| Total households | 11,769 |
| Family households (families) | 7,057 |
| Married-couple family | 490 |
| Male householder, no wife present, family | 1,433 |
| Female householder, no husband present, family | 1,057 |
| Nonfamily households | 2,789 |
| Average household size | 3,440 |
| Average family size | 2.72 |
Economic characteristics in O'Fallon city, Illinois
| Total households | 11,769 |
| Less than $10,000 | 292 |
| $10,000 to $14,999 | 215 |
| $15,000 to $24,999 | 530 |
| $25,000 to $34,999 | 659 |
| $35,000 to $49,999 | 1,098 |
| $50,000 to $74,999 | 2,118 |
| $75,000 to $99,999 | 1,253 |
| $100,000 to $149,999 | 2,323 |
| $150,000 to $199,999 | 1,698 |
| $200,000 or more | 1,583 |
| Median household income (dollars) | 96,698 |
Housing characteristics in O'Fallon city, Illinois
| Total housing units | 12,637 |
| Occupied housing units | 11,769 |
| Vacant housing units | 868 |
| Total housing units | 12,637 |
| 1-unit, detached | 8,953 |
| 1-unit, attached | 739 |
| 2 units | 300 |
| 3 or 4 units | 481 |
| 5 to 9 units | 890 |
| 10 to 19 units | 238 |
| 20 or more units | 690 |
| Mobile home | 346 |
| Boat, RV, van, etc. | 0 |
| Total housing units | 12,637 |
| Built 2014 or later | 0 |
| Built 2010 to 2013 | 1,881 |
| Built 2000 to 2009 | 2,874 |
| Built 1990 to 1999 | 2,553 |
| Built 1980 to 1989 | 1,851 |
| Built 1970 to 1979 | 1,394 |
| Built 1960 to 1969 | 677 |
| Built 1950 to 1959 | 670 |
| Built 1940 to 1949 | 180 |
| Built 1939 or earlier | 557 |
| Total housing units | 12,637 |
| 1 room | 285 |
| 2 rooms | 265 |
| 3 rooms | 473 |
| 4 rooms | 1,737 |
| 5 rooms | 1,703 |
| 6 rooms | 1,475 |
| 7 rooms | 1,510 |
| 8 rooms | 1,995 |
| 9 rooms or more | 3,194 |
| Median rooms | 6.8 |
| Total housing units | 12,637 |
| No bedroom | 320 |
| 1 bedroom | 821 |
| 2 bedrooms | 2,698 |
| 3 bedrooms | 3,669 |
| 4 bedrooms | 3,967 |
| 5 or more bedrooms | 1,162 |
| Occupied housing units | 11,769 |
| Owner-occupied | 8,542 |
| Renter-occupied | 3,227 |
| Average household size of owner-occupied unit | 2.94 |
| Average household size of renter-occupied unit | 2.13 |
| Occupied housing units | 11,769 |
| Moved in 2017 or later | 977 |
| Moved in 2015 to 2016 | 4,056 |
| Moved in 2010 to 2014 | 2,354 |
| Moved in 2000 to 2009 | 2,568 |
| Moved in 1990 to 1999 | 1,125 |
| Moved in 1989 and earlier | 689 |
| Owner-occupied units | 8,542 |
| Less than $50,000 | 367 |
| $50,000 to $99,999 | 590 |
| $100,000 to $149,999 | 1,042 |
| $150,000 to $199,999 | 1,430 |
| $200,000 to $299,999 | 3,244 |
| $300,000 to $499,999 | 1,728 |
| $500,000 to $999,999 | 123 |
| $1,000,000 or more | 18 |
| Median (dollars) | 224,000 |
| Owner-occupied units | 8,542 |
| Housing units with a mortgage | 6,455 |
| Housing units without a mortgage | 2,087 |
| Occupied units paying rent | 3,091 |
| Less than $500 | 254 |
| $500 to $999 | 949 |
| $1,000 to $1,499 | 1,125 |
| $1,500 to $1,999 | 402 |
| $2,000 to $2,499 | 138 |
| $2,500 to $2,999 | 78 |
| $3,000 or more | 145 |
| Median (dollars) | 1,129 |
| No rent paid | 136 |
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