| 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 |


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| 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 | 5,640 | 90% | 86.5% |
| Cold Spring Harbor, NY | 2,967 | 87% | 81.3% |
| Plainview, NY | 26,865 | 83% | 72.1% |
| West Sayville, NY | 5,133 | 82% | 69.8% |
| Hauppauge, NY | 20,417 | 80% | 66.3% |
| Central Islip, NY | 34,526 | 38% | 21.3% |
| City | Population | Avg. Test Scores | National Avg. |
| Dalton, GA | 34,537 | 38% | 21.0% |
| DeLand, FL | 34,541 | 50% | 4.4% |
| Kearney, NE | 34,543 | 57% | 18.8% |
| Franklin Town, MA | 34,557 | 68% | 41.7% |
| Alabaster, AL | 34,559 | 55% | 15.1% |
| Central Islip, NY | 34,526 | 38% | 21.3% |