| Index | Shelter Island Heights | New York | National |
| Average Test Scores | n/a | 56% | 48% |
| Student/Teacher ratio | n/a | n/a | 16:1 |
| Total public schools | n/a | 4,060 | 79,221 |
| Total private schools | n/a | 1,092 | 24,874 |
| Total post-secondary schools | n/a | 483 | 7,963 |
| Index | Shelter Island Heights | New York | National |
| Completed 8th grade | 100.0% | 83.5% | 84.3% |
| Completed high school | 100.0% | 82.1% | 83.0% |
| Completed some college | 88.2% | 59.5% | 59.4% |
| Completed associate degree | 73.2% | 43.4% | 38.5% |
| Completed bachelors | 63.9% | 34.7% | 30.3% |
| Completed masters | 33.1% | 15.1% | 11.5% |
| Completed professional degree | 0.6% | 4.2% | 3.3% |
| Completed doctorate | 0.6% | 1.5% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Shelter Island Heights. Using the proficiency score averages, the average test scores for Shelter Island Heights, NY schools is n/a. The average student to teacher ratio is n/a. In Shelter Island Heights, NY, an average of 100.0% of students have completed 8th grade and an average of 100.0% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Amagansett, NY | 510 | 80% | 66.7% |
| Mattituck, NY | 4,898 | 77% | 60.4% |
| Madison Center, CT | 2,009 | 77% | 60.4% |
| Westbrook Center, CT | 2,257 | 77% | 60.4% |
| Sag Harbor, NY | 1,959 | 65% | 34.4% |
| Shelter Island Heights, NY | 763 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Racine, OH | 763 | 58% | 20.3% |
| Hornbeck, LA | 763 | 85% | 76.0% |
| Eau Claire, MI | 763 | 19% | 60.8% |
| Colo, IA | 764 | 80% | 65.6% |
| Highland Hills, OH | 764 | 42% | 12.0% |
| Shelter Island Heights, NY | 763 | n/a |
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