This was 13 percent lower than the state average of 38 percent. In 2020 the total municipality population reached 74.
79.7 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Foster for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 13 | 20.3 |
| Regular high school diploma | 17 | 26.6 |
| GED or alternative credential | 4 | 6.2 |
| Some college, less than 1 year | 4 | 6.2 |
| Some college, 1 or more years, no degree | 10 | 15.6 |
| Associate's degree | 11 | 17.2 |
| Bachelor's degree | 2 | 3.1 |
| Master's degree | 3 | 4.7 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 0 | 0 |
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