This was 10 percent lower than the state average of 38 percent. In 2020 the total municipality population reached 692.
96.3 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Stewartsville for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 16 | 3.7 |
| Regular high school diploma | 174 | 40.6 |
| GED or alternative credential | 31 | 7.2 |
| Some college, less than 1 year | 45 | 10.5 |
| Some college, 1 or more years, no degree | 43 | 10 |
| Associate's degree | 26 | 6.1 |
| Bachelor's degree | 71 | 16.6 |
| Master's degree | 14 | 3.3 |
| Professional school degree | 7 | 1.6 |
| Doctorate degree | 2 | 0.5 |

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