| Index | Sayville | New York | National |
| Average Test Scores | 66% | 56% | 48% |
| Student/Teacher ratio | n/a | n/a | 16:1 |
| Total public schools | 3 | 4,060 | 79,221 |
| Total private schools | 3 | 1,092 | 24,874 |
| Total post-secondary schools | n/a | 483 | 7,963 |
| Index | Sayville | New York | National |
| Completed 8th grade | 92.4% | 83.5% | 84.3% |
| Completed high school | 91.4% | 82.1% | 83.0% |
| Completed some college | 68.4% | 59.5% | 59.4% |
| Completed associate degree | 54.4% | 43.4% | 38.5% |
| Completed bachelors | 44.6% | 34.7% | 30.3% |
| Completed masters | 22.2% | 15.1% | 11.5% |
| Completed professional degree | 3.4% | 4.2% | 3.3% |
| Completed doctorate | 0.8% | 1.5% | 1.3% |
There are a total of 3 public schools, 3 private schools and n/a post-secondary schools in Sayville. Using the proficiency score averages, the average test scores for Sayville, NY schools is 66%. The average student to teacher ratio is n/a. In Sayville, NY, an average of 92.4% of students have completed 8th grade and an average of 91.4% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| West Sayville, NY | 4,956 | 82% | 69.8% |
| Shoreham, NY | 375 | 82% | 69.8% |
| Hauppauge, NY | 19,661 | 80% | 66.3% |
| Setauket-East Setauket, NY | 14,174 | 80% | 65.6% |
| Elwood, NY | 11,582 | 79% | 63.5% |
| Sayville, NY | 15,910 | 66% | 36.5% |
| City | Population | Avg. Test Scores | National Avg. |
| Grandville, MI | 15,906 | 60% | 24.0% |
| Discovery Bay, CA | 15,904 | 54% | 11.5% |
| Aberdeen, MD | 15,904 | 31% | 36.3% |
| Indianola, IA | 15,921 | 74% | 54.0% |
| Hibbing, MN | 15,923 | 61% | 27.6% |
| Sayville, NY | 15,910 | 66% | 36.5% |
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