This was 2 percent higher than the state average of 42.7 percent. In 2020 the total municipality population reached 21,936.
94.6 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Gardner for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 721 | 5.4 |
| Regular high school diploma | 2,692 | 20 |
| GED or alternative credential | 656 | 4.9 |
| Some college, less than 1 year | 1,222 | 9.1 |
| Some college, 1 or more years, no degree | 2,155 | 16 |
| Associate's degree | 1,308 | 9.7 |
| Bachelor's degree | 3,492 | 25.9 |
| Master's degree | 1,077 | 8 |
| Professional school degree | 99 | 0.7 |
| Doctorate degree | 39 | 0.3 |
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