| Index | Central Islip | New York | National |
| Average Test Scores | 38% | 56% | 48% |
| Student/Teacher ratio | n/a | n/a | 16:1 |
| Total public schools | 8 | 4,060 | 79,221 |
| Total private schools | 1 | 1,092 | 24,874 |
| Total post-secondary schools | n/a | 483 | 7,963 |
| Index | Central Islip | New York | National |
| Completed 8th grade | 69.2% | 83.5% | 84.3% |
| Completed high school | 67.6% | 82.1% | 83.0% |
| Completed some college | 40.2% | 59.5% | 59.4% |
| Completed associate degree | 22.6% | 43.4% | 38.5% |
| Completed bachelors | 16.6% | 34.7% | 30.3% |
| Completed masters | 6.6% | 15.1% | 11.5% |
| Completed professional degree | 1.8% | 4.2% | 3.3% |
| Completed doctorate | 0.3% | 1.5% | 1.3% |
There are a total of 8 public schools, 1 private schools and n/a post-secondary schools in Central Islip. Using the proficiency score averages, the average test scores for Central Islip, NY schools is 38%. The average student to teacher ratio is n/a. In Central Islip, NY, an average of 69.2% of students have completed 8th grade and an average of 67.6% 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% |
| Plainview, NY | 26,267 | 83% | 72.1% |
| West Sayville, NY | 4,956 | 82% | 69.8% |
| Hauppauge, NY | 19,661 | 80% | 66.3% |
| Central Islip, NY | 33,591 | 38% | 21.3% |
| City | Population | Avg. Test Scores | National Avg. |
| Mason, OH | 33,592 | 87% | 81.8% |
| Deer Park, TX | 33,599 | 55% | 13.9% |
| Huntington Station, NY | 33,612 | 54% | 12.0% |
| DeLand, FL | 33,620 | 50% | 4.4% |
| Myrtle Beach, SC | 33,638 | 61% | 27.1% |
| Central Islip, NY | 33,591 | 38% | 21.3% |
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