This was 6.4 percent lower than the state average of 38 percent. In 2020 the total municipality population reached 117.
86.8 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Sumner for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 10 | 13.2 |
| Regular high school diploma | 32 | 42.1 |
| GED or alternative credential | 6 | 7.9 |
| Some college, less than 1 year | 2 | 2.6 |
| Some college, 1 or more years, no degree | 2 | 2.6 |
| Associate's degree | 2 | 2.6 |
| Bachelor's degree | 11 | 14.5 |
| Master's degree | 0 | 0 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 11 | 14.5 |
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