This was 25 percent higher than the state average of 43.7 percent. In 2020 the total municipality population reached 23,363.
97.8 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Lisle for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 357 | 2.2 |
| Regular high school diploma | 1,888 | 11.8 |
| GED or alternative credential | 232 | 1.5 |
| Some college, less than 1 year | 703 | 4.4 |
| Some college, 1 or more years, no degree | 1,810 | 11.3 |
| Associate's degree | 1,094 | 6.9 |
| Bachelor's degree | 5,503 | 34.5 |
| Master's degree | 3,421 | 21.4 |
| Professional school degree | 541 | 3.4 |
| Doctorate degree | 403 | 2.5 |
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