This was 17.8 percent higher than the state average of 43.2 percent. In 2020 the total municipality population reached 559.
98.6 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in McCool Junction for 2020*
| Degree | Number of people | Percentage of population | 
|---|---|---|
| No degree | 5 | 1.4 | 
| Regular high school diploma | 73 | 20.9 | 
| GED or alternative credential | 9 | 2.6 | 
| Some college, less than 1 year | 34 | 9.7 | 
| Some college, 1 or more years, no degree | 15 | 4.3 | 
| Associate's degree | 166 | 47.6 | 
| Bachelor's degree | 36 | 10.3 | 
| Master's degree | 9 | 2.6 | 
| Professional school degree | 0 | 0 | 
| Doctorate degree | 2 | 0.6 | 

 
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