This was 25.1 percent lower than the state average of 40.2 percent. In 2020 the total municipality population reached 960.
76.2 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Shellman for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 145 | 23.8 |
| Regular high school diploma | 188 | 30.9 |
| GED or alternative credential | 44 | 7.2 |
| Some college, less than 1 year | 43 | 7.1 |
| Some college, 1 or more years, no degree | 96 | 15.8 |
| Associate's degree | 39 | 6.4 |
| Bachelor's degree | 38 | 6.2 |
| Master's degree | 12 | 2 |
| Professional school degree | 3 | 0.5 |
| Doctorate degree | 0 | 0 |
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