This was 12.7 percent lower than the state average of 52.2 percent. In 2020 the total municipality population reached 11,051.
93 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Holbrook for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 565 | 7 |
| Regular high school diploma | 2,204 | 27.5 |
| GED or alternative credential | 182 | 2.3 |
| Some college, less than 1 year | 475 | 5.9 |
| Some college, 1 or more years, no degree | 1,427 | 17.8 |
| Associate's degree | 794 | 9.9 |
| Bachelor's degree | 1,612 | 20.1 |
| Master's degree | 604 | 7.5 |
| Professional school degree | 72 | 0.9 |
| Doctorate degree | 81 | 1 |
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