This was 23.2 percent higher than the state average of 43.7 percent. In 2020 the total municipality population reached 573.
100 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Mettawa for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 0 | 0 |
| Regular high school diploma | 52 | 12.7 |
| GED or alternative credential | 2 | 0.5 |
| Some college, less than 1 year | 17 | 4.1 |
| Some college, 1 or more years, no degree | 65 | 15.8 |
| Associate's degree | 15 | 3.6 |
| Bachelor's degree | 136 | 33.1 |
| Master's degree | 76 | 18.5 |
| Professional school degree | 20 | 4.9 |
| Doctorate degree | 28 | 6.8 |
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