This was 13.1 percent lower than the state average of 43.7 percent. In 2020 the total municipality population reached 1,579.
88 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Grayville for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 134 | 12 |
| Regular high school diploma | 272 | 24.4 |
| GED or alternative credential | 79 | 7.1 |
| Some college, less than 1 year | 100 | 9 |
| Some college, 1 or more years, no degree | 189 | 17 |
| Associate's degree | 183 | 16.4 |
| Bachelor's degree | 130 | 11.7 |
| Master's degree | 23 | 2.1 |
| Professional school degree | 1 | less than 0.1 |
| Doctorate degree | 4 | 0.4 |
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