This was 20.2 percent lower than the state average of 42.7 percent. In 2020 the total municipality population reached 3,388.
88.9 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Rio Dell city for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 245 | 11.1 |
| Regular high school diploma | 616 | 27.8 |
| GED or alternative credential | 233 | 10.5 |
| Some college, less than 1 year | 239 | 10.8 |
| Some college, 1 or more years, no degree | 381 | 17.2 |
| Associate's degree | 300 | 13.6 |
| Bachelor's degree | 139 | 6.3 |
| Master's degree | 41 | 1.9 |
| Professional school degree | 3 | 0.1 |
| Doctorate degree | 15 | 0.7 |
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