This was 8.5 percent lower than the state average of 46.3 percent. In 2020 the total municipality population reached 952.
96.9 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Castile for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 20 | 3.1 |
| Regular high school diploma | 248 | 38.2 |
| GED or alternative credential | 32 | 4.9 |
| Some college, less than 1 year | 39 | 6 |
| Some college, 1 or more years, no degree | 65 | 10 |
| Associate's degree | 112 | 17.3 |
| Bachelor's degree | 91 | 14 |
| Master's degree | 32 | 4.9 |
| Professional school degree | 3 | 0.5 |
| Doctorate degree | 7 | 1.1 |
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