| Index | Islandia | New York | National |
| Average Test Scores | 38% | 56% | 48% |
| Student/Teacher ratio | n/a | n/a | 16:1 |
| Total public schools | n/a | 4,060 | 79,221 |
| Total private schools | 2 | 1,092 | 24,874 |
| Total post-secondary schools | n/a | 483 | 7,963 |
| Index | Islandia | New York | National |
| Completed 8th grade | 84.9% | 83.5% | 84.3% |
| Completed high school | 84.0% | 82.1% | 83.0% |
| Completed some college | 52.6% | 59.5% | 59.4% |
| Completed associate degree | 31.7% | 43.4% | 38.5% |
| Completed bachelors | 23.5% | 34.7% | 30.3% |
| Completed masters | 7.6% | 15.1% | 11.5% |
| Completed professional degree | 1.4% | 4.2% | 3.3% |
| Completed doctorate | 0.6% | 1.5% | 1.3% |
There are a total of n/a public schools, 2 private schools and n/a post-secondary schools in Islandia. Using the proficiency score averages, the average test scores for Islandia, NY schools is 38%. The average student to teacher ratio is n/a. In Islandia, NY, an average of 84.9% of students have completed 8th grade and an average of 84.0% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Old Bethpage, NY | 5,450 | 90% | 86.5% |
| Cold Spring Harbor, NY | 2,864 | 87% | 81.3% |
| Shoreham, NY | 375 | 82% | 69.8% |
| West Sayville, NY | 4,956 | 82% | 69.8% |
| Hauppauge, NY | 19,661 | 80% | 66.3% |
| Islandia, NY | 3,315 | 38% | 21.9% |
| City | Population | Avg. Test Scores | National Avg. |
| Andrews AFB, MD | 3,316 | 38% | 21.9% |
| Edcouch, TX | 3,314 | 37% | 22.4% |
| Masontown, PA | 3,314 | 47% | 2.1% |
| Lyons, NY | 3,313 | 42% | 13.5% |
| Carrollton, OH | 3,310 | 69% | 44.0% |
| Islandia, NY | 3,315 | 38% | 21.9% |
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