This was 11.7 percent lower than the state average of 43.2 percent. In 2020 the total municipality population reached 115.
91.3 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Prosser for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 8 | 8.7 |
| Regular high school diploma | 43 | 46.7 |
| GED or alternative credential | 6 | 6.5 |
| Some college, less than 1 year | 0 | 0 |
| Some college, 1 or more years, no degree | 6 | 6.5 |
| Associate's degree | 3 | 3.3 |
| Bachelor's degree | 18 | 19.6 |
| Master's degree | 4 | 4.3 |
| Professional school degree | 1 | 1.1 |
| Doctorate degree | 3 | 3.3 |
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