This was 18.4 percent lower than the state average of 38 percent. In 2020 the total municipality population reached 354.
82.5 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Otterville for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 42 | 17.5 |
| Regular high school diploma | 82 | 34.2 |
| GED or alternative credential | 7 | 2.9 |
| Some college, less than 1 year | 20 | 8.3 |
| Some college, 1 or more years, no degree | 42 | 17.5 |
| Associate's degree | 28 | 11.7 |
| Bachelor's degree | 18 | 7.5 |
| Master's degree | 1 | 0.4 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 0 | 0 |
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