This was 2.8 percent lower than the state average of 46.3 percent. In 2020 the total municipality population reached 1,291.
95.2 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Hillside Lake for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 42 | 4.8 |
| Regular high school diploma | 236 | 27.2 |
| GED or alternative credential | 56 | 6.5 |
| Some college, less than 1 year | 57 | 6.6 |
| Some college, 1 or more years, no degree | 99 | 11.4 |
| Associate's degree | 191 | 22 |
| Bachelor's degree | 125 | 14.4 |
| Master's degree | 62 | 7.1 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 0 | 0 |
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