This was 19.7 percent lower than the state average of 43.2 percent. In 2020 the total municipality population reached 12,867.
73.5 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in South Sioux for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 2,077 | 26.5 |
| Regular high school diploma | 2,267 | 28.9 |
| GED or alternative credential | 283 | 3.6 |
| Some college, less than 1 year | 357 | 4.6 |
| Some college, 1 or more years, no degree | 1,019 | 13 |
| Associate's degree | 791 | 10.1 |
| Bachelor's degree | 761 | 9.7 |
| Master's degree | 278 | 3.5 |
| Professional school degree | 9 | 0.1 |
| Doctorate degree | 0 | 0 |
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