This was 34.8 percent lower than the state average of 43.7 percent. In 2020 the total municipality population reached 2,916.
58.9 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 | 920 | 41.1 |
| Regular high school diploma | 347 | 15.5 |
| GED or alternative credential | 411 | 18.3 |
| Some college, less than 1 year | 97 | 4.3 |
| Some college, 1 or more years, no degree | 266 | 11.9 |
| Associate's degree | 116 | 5.2 |
| Bachelor's degree | 56 | 2.5 |
| Master's degree | 21 | 0.9 |
| Professional school degree | 7 | 0.3 |
| Doctorate degree | 0 | 0 |
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