This was 16.6 percent lower than the state average of 43.7 percent. In 2020 the total municipality population reached 808.
90 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in McLean for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 54 | 10 |
| Regular high school diploma | 184 | 34.2 |
| GED or alternative credential | 41 | 7.6 |
| Some college, less than 1 year | 46 | 8.6 |
| Some college, 1 or more years, no degree | 67 | 12.5 |
| Associate's degree | 31 | 5.8 |
| Bachelor's degree | 99 | 18.4 |
| Master's degree | 16 | 3 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 0 | 0 |
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