| 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 |
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| 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 | 5,133 | 82% | 69.8% |
| Shoreham, NY | 390 | 82% | 69.8% |
| Hauppauge, NY | 20,417 | 80% | 66.3% |
| Setauket-East Setauket, NY | 14,614 | 80% | 65.6% |
| Elwood, NY | 11,955 | 79% | 63.5% |
| Sayville, NY | 16,433 | 66% | 36.5% |
| City | Population | Avg. Test Scores | National Avg. |
| Albemarle, NC | 16,433 | 39% | 19.2% |
| Prospect Heights, IL | 16,432 | 47% | 2.1% |
| Crawfordsville, IN | 16,427 | 44% | 8.0% |
| Walnut Park, CA | 16,426 | 30% | 37.8% |
| River Falls, WI | 16,442 | 52% | 8.0% |
| Sayville, NY | 16,433 | 66% | 36.5% |
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