This was 26.6 percent lower than the state average of 48.4 percent. In 2020 the total municipality population reached 171.
92.7 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Iona for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 9 | 7.3 |
| Regular high school diploma | 24 | 19.4 |
| GED or alternative credential | 6 | 4.8 |
| Some college, less than 1 year | 33 | 26.6 |
| Some college, 1 or more years, no degree | 25 | 20.2 |
| Associate's degree | 19 | 15.3 |
| Bachelor's degree | 8 | 6.5 |
| Master's degree | 0 | 0 |
| Professional school degree | 0 | 0 |
| Doctorate degree | 0 | 0 |
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