This was 35.2 percent higher than the state average of 33.9 percent. In 2020 the total municipality population reached 287.
95.1 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Glenbrook for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 12 | 4.9 |
| Regular high school diploma | 41 | 16.7 |
| GED or alternative credential | 0 | 0 |
| Some college, less than 1 year | 0 | 0 |
| Some college, 1 or more years, no degree | 23 | 9.3 |
| Associate's degree | 0 | 0 |
| Bachelor's degree | 91 | 37 |
| Master's degree | 66 | 26.8 |
| Professional school degree | 13 | 5.3 |
| Doctorate degree | 0 | 0 |
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