This was 39.8 percent higher than the state average of 43.7 percent. In 2020 the total municipality population reached 8,834.
97 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Clarendon Hills for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 169 | 3 |
| Regular high school diploma | 333 | 5.9 |
| GED or alternative credential | 25 | 0.4 |
| Some college, less than 1 year | 123 | 2.2 |
| Some college, 1 or more years, no degree | 276 | 4.9 |
| Associate's degree | 211 | 3.8 |
| Bachelor's degree | 2,687 | 47.9 |
| Master's degree | 1,201 | 21.4 |
| Professional school degree | 478 | 8.5 |
| Doctorate degree | 112 | 2 |

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