| Index | Yaphank | New York | National |
| Average Test Scores | 42% | 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 | Yaphank | New York | National |
| Completed 8th grade | 87.5% | 83.5% | 84.3% |
| Completed high school | 87.2% | 82.1% | 83.0% |
| Completed some college | 57.7% | 59.5% | 59.4% |
| Completed associate degree | 39.0% | 43.4% | 38.5% |
| Completed bachelors | 28.4% | 34.7% | 30.3% |
| Completed masters | 13.9% | 15.1% | 11.5% |
| Completed professional degree | 2.3% | 4.2% | 3.3% |
| Completed doctorate | 0.7% | 1.5% | 1.3% |
There are a total of 2 public schools, 1 private schools and n/a post-secondary schools in Yaphank. Using the proficiency score averages, the average test scores for Yaphank, NY schools is 42%. The average student to teacher ratio is n/a. In Yaphank, NY, an average of 87.5% of students have completed 8th grade and an average of 87.2% 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% |
| Port Jefferson, NY | 8,248 | 77% | 60.8% |
| Yaphank, NY | 6,302 | 42% | 12.5% |
| City | Population | Avg. Test Scores | National Avg. |
| Larchmont, NY | 6,304 | 76% | 57.3% |
| Los Ranchos de Albuquerque, NM | 6,300 | 27% | 43.8% |
| Junction City, OR | 6,305 | 47% | 1.6% |
| Colusa, CA | 6,305 | 47% | 2.6% |
| Newberry, FL | 6,306 | 63% | 31.5% |
| Yaphank, NY | 6,302 | 42% | 12.5% |
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