This was 24.1 percent lower than the state average of 42.6 percent. In 2020 the total municipality population reached 88.
94.4 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Garrison for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 3 | 5.6 |
| Regular high school diploma | 15 | 27.8 |
| GED or alternative credential | 4 | 7.4 |
| Some college, less than 1 year | 6 | 11.1 |
| Some college, 1 or more years, no degree | 16 | 29.6 |
| Associate's degree | 10 | 18.5 |
| Bachelor's degree | 0 | 0 |
| Master's degree | 0 | 0 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 0 | 0 |
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