This was 17.5 percent higher than the state average of 43.7 percent. In 2020 the total municipality population reached 8,610.
97.9 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Willowbrook for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 144 | 2.1 |
| Regular high school diploma | 1,147 | 17.1 |
| GED or alternative credential | 71 | 1.1 |
| Some college, less than 1 year | 434 | 6.5 |
| Some college, 1 or more years, no degree | 808 | 12 |
| Associate's degree | 389 | 5.8 |
| Bachelor's degree | 2,027 | 30.2 |
| Master's degree | 1,036 | 15.4 |
| Professional school degree | 490 | 7.3 |
| Doctorate degree | 161 | 2.4 |
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