This was 12.4 percent lower than the state average of 43.7 percent. In 2020 the total municipality population reached 2,539.
89 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in McLeansboro for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 204 | 11 |
| Regular high school diploma | 524 | 28.2 |
| GED or alternative credential | 77 | 4.1 |
| Some college, less than 1 year | 183 | 9.8 |
| Some college, 1 or more years, no degree | 289 | 15.6 |
| Associate's degree | 109 | 5.9 |
| Bachelor's degree | 278 | 15 |
| Master's degree | 142 | 7.6 |
| Professional school degree | 32 | 1.7 |
| Doctorate degree | 20 | 1.1 |
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