This was 1 percent higher than the state average of 38.9 percent. In 2020 the total municipality population reached 1,175.
94.3 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Johnsonville for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 44 | 5.7 |
| Regular high school diploma | 222 | 28.7 |
| GED or alternative credential | 26 | 3.4 |
| Some college, less than 1 year | 26 | 3.4 |
| Some college, 1 or more years, no degree | 147 | 19 |
| Associate's degree | 102 | 13.2 |
| Bachelor's degree | 103 | 13.3 |
| Master's degree | 72 | 9.3 |
| Professional school degree | 16 | 2.1 |
| Doctorate degree | 16 | 2.1 |
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