This was 7.3 percent lower than the state average of 46.8 percent. In 2020 the total municipality population reached 3,631.
96 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Key Center for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 102 | 4 |
| Regular high school diploma | 327 | 12.8 |
| GED or alternative credential | 96 | 3.8 |
| Some college, less than 1 year | 228 | 8.9 |
| Some college, 1 or more years, no degree | 793 | 31 |
| Associate's degree | 347 | 13.6 |
| Bachelor's degree | 459 | 18 |
| Master's degree | 135 | 5.3 |
| Professional school degree | 20 | 0.8 |
| Doctorate degree | 50 | 2 |
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