This was 8.3 percent lower than the state average of 41 percent. In 2020 the total municipality population reached 1,005.
93 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Castanea for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 53 | 7 |
| Regular high school diploma | 349 | 46.2 |
| GED or alternative credential | 29 | 3.8 |
| Some college, less than 1 year | 43 | 5.7 |
| Some college, 1 or more years, no degree | 34 | 4.5 |
| Associate's degree | 80 | 10.6 |
| Bachelor's degree | 95 | 12.6 |
| Master's degree | 55 | 7.3 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 17 | 2.3 |
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