This was 8.3 percent lower than the state average of 46.8 percent. In 2020 the total municipality population reached 10,246.
92.7 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 | 544 | 7.3 |
| Regular high school diploma | 1,701 | 22.8 |
| GED or alternative credential | 424 | 5.7 |
| Some college, less than 1 year | 773 | 10.4 |
| Some college, 1 or more years, no degree | 1,139 | 15.3 |
| Associate's degree | 880 | 11.8 |
| Bachelor's degree | 1,522 | 20.4 |
| Master's degree | 334 | 4.5 |
| Professional school degree | 88 | 1.2 |
| Doctorate degree | 42 | 0.6 |
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