This was 9.8 percent higher than the state average of 36 percent. In 2020 the total municipality population reached 18,382.
89.7 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in St. John for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 1,315 | 10.3 |
| Regular high school diploma | 2,718 | 21.4 |
| GED or alternative credential | 225 | 1.8 |
| Some college, less than 1 year | 1,024 | 8.1 |
| Some college, 1 or more years, no degree | 1,611 | 12.7 |
| Associate's degree | 1,390 | 10.9 |
| Bachelor's degree | 3,033 | 23.9 |
| Master's degree | 1,137 | 8.9 |
| Professional school degree | 157 | 1.2 |
| Doctorate degree | 99 | 0.8 |
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