This was 5 percent lower than the state average of 44.7 percent. In 2020 the total municipality population reached 211.
94.8 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Cornish for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 6 | 5.2 |
| Regular high school diploma | 43 | 37.1 |
| GED or alternative credential | 4 | 3.4 |
| Some college, less than 1 year | 2 | 1.7 |
| Some college, 1 or more years, no degree | 15 | 12.9 |
| Associate's degree | 5 | 4.3 |
| Bachelor's degree | 22 | 19 |
| Master's degree | 16 | 13.8 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 3 | 2.6 |
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