This was 19.2 percent higher than the state average of 46.3 percent. In 2020 the total municipality population reached 3,228.
90.2 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Lake Success for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 229 | 9.8 |
| Regular high school diploma | 409 | 17.4 |
| GED or alternative credential | 14 | 0.6 |
| Some college, less than 1 year | 37 | 1.6 |
| Some college, 1 or more years, no degree | 120 | 5.1 |
| Associate's degree | 117 | 5 |
| Bachelor's degree | 564 | 24.1 |
| Master's degree | 491 | 20.9 |
| Professional school degree | 239 | 10.2 |
| Doctorate degree | 125 | 5.3 |
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