| 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 |
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| 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 | 5,640 | 90% | 86.5% |
| Cold Spring Harbor, NY | 2,967 | 87% | 81.3% |
| Shoreham, NY | 390 | 82% | 69.8% |
| West Sayville, NY | 5,133 | 82% | 69.8% |
| Hauppauge, NY | 20,417 | 80% | 66.3% |
| Islandia, NY | 3,426 | 38% | 21.9% |
| City | Population | Avg. Test Scores | National Avg. |
| Springdale, PA | 3,426 | 50% | 3.1% |
| Sonora, TX | 3,425 | 53% | 10.1% |
| Greensboro, GA | 3,428 | 30% | 37.2% |
| Hatfield, PA | 3,428 | 61% | 26.4% |
| Blackstone, VA | 3,429 | 72% | 50.0% |
| Islandia, NY | 3,426 | 38% | 21.9% |
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