This was 12.3 percent lower than the state average of 31.3 percent. In 2020 the total municipality population reached 564.
79.1 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Joiner city for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 76 | 20.9 |
| Regular high school diploma | 138 | 38 |
| GED or alternative credential | 33 | 9.1 |
| Some college, less than 1 year | 22 | 6.1 |
| Some college, 1 or more years, no degree | 25 | 6.9 |
| Associate's degree | 18 | 5 |
| Bachelor's degree | 33 | 9.1 |
| Master's degree | 3 | 0.8 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 15 | 4.1 |
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