This was 12.4 percent lower than the state average of 43.7 percent. In 2020 the total municipality population reached 37,651.
86.7 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Rock Island for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 3,178 | 13.3 |
| Regular high school diploma | 5,445 | 22.9 |
| GED or alternative credential | 1,246 | 5.2 |
| Some college, less than 1 year | 2,499 | 10.5 |
| Some college, 1 or more years, no degree | 3,992 | 16.8 |
| Associate's degree | 2,163 | 9.1 |
| Bachelor's degree | 3,240 | 13.6 |
| Master's degree | 1,482 | 6.2 |
| Professional school degree | 315 | 1.3 |
| Doctorate degree | 247 | 1 |
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