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Below is information on the population, racial profile, house hold count, and sex/age profiles for the city of O'fallon. These results are gathered once every 10 years and may not be 100% accurate or up to date.
The population for O'fallon, Illinois is approximatly 21910.
Racial profile for O'fallon:
| White : | 18113 |
| Black : | 2627 |
| Native American : | 51 |
| Asian : | 542 |
| Pacific Islander : | 15 |
| Other : | 174 |
| * results may not accumulate to total population due to mixed race individuals | |
Population by age for males in O'fallon, Illinois :
| 18 - 19 : | 283 |
| 20 : | 120 |
| 21 : | 114 |
| 22 - 24 : | 347 |
| 25 - 29 : | 646 |
| 30 - 34 : | 784 |
| 35 - 39 : | 927 |
| 40 - 44 : | 1044 |
| 45 - 49 : | 907 |
| 50 - 54 : | 752 |
| 55 - 59 : | 485 |
| 60 - 61 : | 123 |
| 62 - 64 : | 160 |
| 65 - 66 : | 119 |
| 67 - 69 : | 145 |
| 70 - 74 : | 224 |
| 75 - 79 : | 142 |
| 80 - 84 : | 83 |
| 85+ : | 36 |
Population by age for females in O'fallon, Illinois :
| 18 - 19 : | 291 |
| 20 : | 99 |
| 21 : | 108 |
| 22 - 24 : | 385 |
| 25 - 29 : | 705 |
| 30 - 34 : | 764 |
| 35 - 39 : | 1048 |
| 40 - 44 : | 1127 |
| 45 - 49 : | 988 |
| 50 - 54 : | 748 |
| 55 - 59 : | 452 |
| 60 - 61 : | 159 |
| 62 - 64 : | 197 |
| 65 - 66 : | 135 |
| 67 - 69 : | 174 |
| 70 - 74 : | 305 |
| 75 - 79 : | 258 |
| 80 - 84 : | 167 |
| 85+ : | 153 |
The total amount of households in O'fallon, Illinois is 8310. With 21807 people of the population in these households. The average household size is 2.62.
18819 people in O'fallon, Illinois are part of a family. The average family size in O'fallon is 3.13 people.
There are 4756 married families in O'fallon, Illinois.
Number of married families by number of members in the family :
| 0 - 2 : | 667 | 3 - 4 : | 446 | 5 : | 231 | 6 - 11 : | 1607 | 12 - 17 : | 1805 |