This number was 21.1 percent lower than the state average of 44 percent. In 2017 the total municipality population reached 33,253.
74.3 percent of the population had at least a high school diploma or the equivalent. The table below shows how many
Central Islip residents who were at least 25 years old in 2017 held each of the listed degrees.
Degree distribution in Central Islip for 2017*
| Degree | Number of people | Percentage of population |
|---|---|---|
| No degree | 5,489 | 25.7 |
| Regular high school diploma | 6,097 | 28.6 |
| GED or alternative credential | 1,006 | 4.7 |
| Some college less than 1 year | 1,243 | 5.8 |
| Some college 1 or more years no degree | 2,619 | 12.3 |
| Associate's degree | 1,511 | 7.1 |
| Bachelor's degree | 2,158 | 10.1 |
| Master's degree | 904 | 4.2 |
| Professional school degree | 254 | 1.2 |
| Doctorate degree | 66 | 0.3 |
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