This was 27.7 percent higher than the state average of 46.3 percent. In 2020 the total municipality population reached 2,602.
94 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Thomaston for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 111 | 6 |
| Regular high school diploma | 205 | 11.1 |
| GED or alternative credential | 21 | 1.1 |
| Some college, less than 1 year | 56 | 3 |
| Some college, 1 or more years, no degree | 85 | 4.6 |
| Associate's degree | 101 | 5.5 |
| Bachelor's degree | 639 | 34.7 |
| Master's degree | 435 | 23.6 |
| Professional school degree | 92 | 5 |
| Doctorate degree | 97 | 5.3 |
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