This was 26.7 percent higher than the state average of 40.5 percent. In 2020 the total municipality population reached 25,377.
95.8 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Keystone for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 744 | 4.2 |
| Regular high school diploma | 2,037 | 11.6 |
| GED or alternative credential | 307 | 1.7 |
| Some college, less than 1 year | 1,027 | 5.9 |
| Some college, 1 or more years, no degree | 1,645 | 9.4 |
| Associate's degree | 1,823 | 10.4 |
| Bachelor's degree | 6,119 | 34.9 |
| Master's degree | 2,792 | 15.9 |
| Professional school degree | 609 | 3.5 |
| Doctorate degree | 446 | 2.5 |
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