This was 10.5 percent lower than the state average of 38.9 percent. In 2020 the total municipality population reached 1,090.
90 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Cottageville for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 71 | 10 |
| Regular high school diploma | 230 | 32.3 |
| GED or alternative credential | 89 | 12.5 |
| Some college, less than 1 year | 42 | 5.9 |
| Some college, 1 or more years, no degree | 77 | 10.8 |
| Associate's degree | 98 | 13.8 |
| Bachelor's degree | 67 | 9.4 |
| Master's degree | 28 | 3.9 |
| Professional school degree | 5 | 0.7 |
| Doctorate degree | 4 | 0.6 |
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