This was 4.5 percent lower than the state average of 43.2 percent. In 2020 the total municipality population reached 242.
95 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 | 9 | 5 | 
| Regular high school diploma | 58 | 32 | 
| GED or alternative credential | 8 | 4.4 | 
| Some college, less than 1 year | 26 | 14.4 | 
| Some college, 1 or more years, no degree | 10 | 5.5 | 
| Associate's degree | 26 | 14.4 | 
| Bachelor's degree | 32 | 17.7 | 
| Master's degree | 12 | 6.6 | 
| Professional school degree | 0 | 0 | 
| Doctorate degree | 0 | 0 | 

 
               
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