This was 22.7 percent lower than the state average of 36 percent. In 2020 the total municipality population reached 1,055.
85.7 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Shirley for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 86 | 14.3 |
| Regular high school diploma | 206 | 34.3 |
| GED or alternative credential | 113 | 18.8 |
| Some college, less than 1 year | 54 | 9 |
| Some college, 1 or more years, no degree | 61 | 10.2 |
| Associate's degree | 48 | 8 |
| Bachelor's degree | 23 | 3.8 |
| Master's degree | 9 | 1.5 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 0 | 0 |
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