This was 17.6 percent higher than the state average of 43.7 percent. In 2020 the total municipality population reached 29,487.
97.1 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in O'Fallon for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 579 | 2.9 |
| Regular high school diploma | 2,689 | 13.4 |
| GED or alternative credential | 469 | 2.3 |
| Some college, less than 1 year | 1,146 | 5.7 |
| Some college, 1 or more years, no degree | 2,869 | 14.3 |
| Associate's degree | 2,319 | 11.6 |
| Bachelor's degree | 5,671 | 28.3 |
| Master's degree | 3,385 | 16.9 |
| Professional school degree | 746 | 3.7 |
| Doctorate degree | 146 | 0.7 |
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