| Index | Sag Harbor | New York | National |
| Average Test Scores | 65% | 56% | 48% |
| Student/Teacher ratio | n/a | n/a | 16:1 |
| Total public schools | 2 | 4,060 | 79,221 |
| Total private schools | 1 | 1,092 | 24,874 |
| Total post-secondary schools | n/a | 483 | 7,963 |
| Index | Sag Harbor | New York | National |
| Completed 8th grade | 92.3% | 83.5% | 84.3% |
| Completed high school | 91.4% | 82.1% | 83.0% |
| Completed some college | 62.7% | 59.5% | 59.4% |
| Completed associate degree | 51.2% | 43.4% | 38.5% |
| Completed bachelors | 46.9% | 34.7% | 30.3% |
| Completed masters | 22.2% | 15.1% | 11.5% |
| Completed professional degree | 9.3% | 4.2% | 3.3% |
| Completed doctorate | 4.3% | 1.5% | 1.3% |
There are a total of 2 public schools, 1 private schools and n/a post-secondary schools in Sag Harbor. Using the proficiency score averages, the average test scores for Sag Harbor, NY schools is 65%. The average student to teacher ratio is n/a. In Sag Harbor, NY, an average of 92.3% of students have completed 8th grade and an average of 91.4% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Amagansett, NY | 510 | 80% | 66.7% |
| Mattituck, NY | 4,898 | 77% | 60.4% |
| East Hampton, NY | 920 | 63% | 31.0% |
| Cutchogue, NY | 2,948 | 59% | 21.9% |
| Hampton Bays, NY | 14,684 | 57% | 19.1% |
| Sag Harbor, NY | 1,959 | 65% | 34.4% |
| City | Population | Avg. Test Scores | National Avg. |
| Eaton, IN | 1,959 | 65% | 34.4% |
| Stillwater, NY | 1,959 | 64% | 32.8% |
| Waldport, OR | 1,959 | 47% | 1.4% |
| Boonville, NY | 1,960 | 58% | 19.8% |
| Elberta, AL | 1,958 | 61% | 27.1% |
| Sag Harbor, NY | 1,959 | 65% | 34.4% |
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