This was 28.5 percent higher than the state average of 46.3 percent. In 2020 the total municipality population reached 1,599.
98.5 percent of the population had at least a high school diploma or the equivalent.
Degree distribution in Nissequogue for 2020*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 17 | 1.5 |
| Regular high school diploma | 94 | 8.4 |
| GED or alternative credential | 6 | 0.5 |
| Some college, less than 1 year | 52 | 4.6 |
| Some college, 1 or more years, no degree | 113 | 10.1 |
| Associate's degree | 66 | 5.9 |
| Bachelor's degree | 370 | 33.1 |
| Master's degree | 241 | 21.5 |
| Professional school degree | 112 | 10 |
| Doctorate degree | 48 | 4.3 |
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