This was 3 percent higher than the state average of 37.7 percent. In 2020 the total municipality population reached 22,904.
94.3 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Willoughby for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 988 | 5.7 |
| Regular high school diploma | 4,788 | 27.6 |
| GED or alternative credential | 443 | 2.6 |
| Some college, less than 1 year | 1,604 | 9.3 |
| Some college, 1 or more years, no degree | 2,449 | 14.1 |
| Associate's degree | 1,638 | 9.5 |
| Bachelor's degree | 3,735 | 21.6 |
| Master's degree | 1,344 | 7.8 |
| Professional school degree | 188 | 1.1 |
| Doctorate degree | 142 | 0.8 |
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