This was 26.8 percent lower than the state average of 43.7 percent. In 2020 the total municipality population reached 263.
85.7 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Joppa for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 22 | 14.3 |
| Regular high school diploma | 43 | 27.9 |
| GED or alternative credential | 18 | 11.7 |
| Some college, less than 1 year | 20 | 13 |
| Some college, 1 or more years, no degree | 25 | 16.2 |
| Associate's degree | 15 | 9.7 |
| Bachelor's degree | 10 | 6.5 |
| Master's degree | 1 | 0.6 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 0 | 0 |
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