This was 14.7 percent lower than the state average of 43.7 percent. In 2020 the total municipality population reached 17,273.
89.8 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Mattoon for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 1,219 | 10.2 |
| Regular high school diploma | 3,727 | 31.1 |
| GED or alternative credential | 836 | 7 |
| Some college, less than 1 year | 1,134 | 9.5 |
| Some college, 1 or more years, no degree | 1,590 | 13.3 |
| Associate's degree | 1,295 | 10.8 |
| Bachelor's degree | 1,400 | 11.7 |
| Master's degree | 596 | 5 |
| Professional school degree | 99 | 0.8 |
| Doctorate degree | 87 | 0.7 |
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