This was 0.2 percent higher than the state average of 40.5 percent. In 2020 the total municipality population reached 13,588.
92.8 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 | 912 | 7.2 |
| Regular high school diploma | 3,584 | 28.3 |
| GED or alternative credential | 148 | 1.2 |
| Some college, less than 1 year | 966 | 7.6 |
| Some college, 1 or more years, no degree | 1,899 | 15 |
| Associate's degree | 710 | 5.6 |
| Bachelor's degree | 2,687 | 21.2 |
| Master's degree | 1,281 | 10.1 |
| Professional school degree | 268 | 2.1 |
| Doctorate degree | 199 | 1.6 |
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