This was 19.9 percent higher than the state average of 43.7 percent. In 2020 the total municipality population reached 12,468.
98.3 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Glen Carbon for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 142 | 1.7 |
| Regular high school diploma | 1,300 | 15.4 |
| GED or alternative credential | 211 | 2.5 |
| Some college, less than 1 year | 489 | 5.8 |
| Some college, 1 or more years, no degree | 938 | 11.1 |
| Associate's degree | 695 | 8.2 |
| Bachelor's degree | 2,433 | 28.8 |
| Master's degree | 1,616 | 19.1 |
| Professional school degree | 310 | 3.7 |
| Doctorate degree | 320 | 3.8 |
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