This was 6.9 percent lower than the state average of 43.7 percent. In 2020 the total municipality population reached 24,489.
93.8 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Collinsville for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 1,081 | 6.2 |
| Regular high school diploma | 4,557 | 26.3 |
| GED or alternative credential | 645 | 3.7 |
| Some college, less than 1 year | 1,528 | 8.8 |
| Some college, 1 or more years, no degree | 3,121 | 18 |
| Associate's degree | 1,750 | 10.1 |
| Bachelor's degree | 2,940 | 17 |
| Master's degree | 1,409 | 8.1 |
| Professional school degree | 165 | 1 |
| Doctorate degree | 111 | 0.6 |
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