This was 0.9 percent higher than the state average of 31.3 percent. In 2020 the total municipality population reached 5,592.
95 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Greenbrier city for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 171 | 5 |
| Regular high school diploma | 811 | 23.6 |
| GED or alternative credential | 328 | 9.5 |
| Some college, less than 1 year | 276 | 8 |
| Some college, 1 or more years, no degree | 746 | 21.7 |
| Associate's degree | 381 | 11.1 |
| Bachelor's degree | 470 | 13.7 |
| Master's degree | 233 | 6.8 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 21 | 0.6 |
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