This was 17.5 percent lower than the state average of 39.6 percent. In 2020 the total municipality population reached 5,017.
91.7 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Allegan for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 245 | 8.3 |
| Regular high school diploma | 1,049 | 35.6 |
| GED or alternative credential | 241 | 8.2 |
| Some college, less than 1 year | 210 | 7.1 |
| Some college, 1 or more years, no degree | 553 | 18.8 |
| Associate's degree | 230 | 7.8 |
| Bachelor's degree | 282 | 9.6 |
| Master's degree | 129 | 4.4 |
| Professional school degree | 7 | 0.2 |
| Doctorate degree | 3 | 0.1 |

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