This was 11.9 percent lower than the state average of 41.1 percent. In 2020 the total municipality population reached 475.
87 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Diagonal for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 45 | 13 |
| Regular high school diploma | 128 | 37 |
| GED or alternative credential | 5 | 1.4 |
| Some college, less than 1 year | 13 | 3.8 |
| Some college, 1 or more years, no degree | 54 | 15.6 |
| Associate's degree | 32 | 9.2 |
| Bachelor's degree | 38 | 11 |
| Master's degree | 31 | 9 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 0 | 0 |
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