This was 20.7 percent lower than the state average of 43.4 percent. In 2020 the total municipality population reached 539.
87.8 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Johnson for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 50 | 12.2 |
| Regular high school diploma | 85 | 20.7 |
| GED or alternative credential | 30 | 7.3 |
| Some college, less than 1 year | 51 | 12.4 |
| Some college, 1 or more years, no degree | 101 | 24.6 |
| Associate's degree | 44 | 10.7 |
| Bachelor's degree | 37 | 9 |
| Master's degree | 12 | 2.9 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 0 | 0 |
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