This was 12.6 percent lower than the state average of 48.4 percent. In 2020 the total municipality population reached 164.
90.2 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Shelly for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 12 | 9.8 |
| Regular high school diploma | 35 | 28.5 |
| GED or alternative credential | 6 | 4.9 |
| Some college, less than 1 year | 16 | 13 |
| Some college, 1 or more years, no degree | 10 | 8.1 |
| Associate's degree | 14 | 11.4 |
| Bachelor's degree | 29 | 23.6 |
| Master's degree | 0 | 0 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 1 | 0.8 |
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