This was 40.9 percent lower than the state average of 46.8 percent. In 2020 the total municipality population reached 298.
85.1 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Custer for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 30 | 14.9 |
| Regular high school diploma | 75 | 37.1 |
| GED or alternative credential | 16 | 7.9 |
| Some college, less than 1 year | 17 | 8.4 |
| Some college, 1 or more years, no degree | 52 | 25.7 |
| Associate's degree | 0 | 0 |
| Bachelor's degree | 12 | 5.9 |
| Master's degree | 0 | 0 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 0 | 0 |
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