This was 7 percent lower than the state average of 35.7 percent. In 2020 the total municipality population reached 6,859.
94.1 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Greenbrier for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 266 | 5.9 |
| Regular high school diploma | 1,388 | 30.7 |
| GED or alternative credential | 307 | 6.8 |
| Some college, less than 1 year | 381 | 8.4 |
| Some college, 1 or more years, no degree | 888 | 19.6 |
| Associate's degree | 330 | 7.3 |
| Bachelor's degree | 797 | 17.6 |
| Master's degree | 140 | 3.1 |
| Professional school degree | 21 | 0.5 |
| Doctorate degree | 9 | 0.2 |
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