| Index | Greenlawn | New York | National |
| Average Test Scores | 78% | 56% | 48% |
| Student/Teacher ratio | n/a | n/a | 16:1 |
| Total public schools | 3 | 4,060 | 79,221 |
| Total private schools | n/a | 1,092 | 24,874 |
| Total post-secondary schools | n/a | 483 | 7,963 |
| Index | Greenlawn | New York | National |
| Completed 8th grade | 91.2% | 83.5% | 84.3% |
| Completed high school | 90.3% | 82.1% | 83.0% |
| Completed some college | 67.7% | 59.5% | 59.4% |
| Completed associate degree | 49.5% | 43.4% | 38.5% |
| Completed bachelors | 41.9% | 34.7% | 30.3% |
| Completed masters | 18.1% | 15.1% | 11.5% |
| Completed professional degree | 5.6% | 4.2% | 3.3% |
| Completed doctorate | 2.2% | 1.5% | 1.3% |
There are a total of 3 public schools, n/a private schools and n/a post-secondary schools in Greenlawn. Using the proficiency score averages, the average test scores for Greenlawn, NY schools is 78%. The average student to teacher ratio is n/a. In Greenlawn, NY, an average of 91.2% of students have completed 8th grade and an average of 90.3% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Sea Cliff, NY | 5,069 | 92% | 91.2% |
| Old Westbury, NY | 4,582 | 91% | 88.1% |
| Jericho, NY | 13,730 | 90% | 86.6% |
| Old Bethpage, NY | 5,439 | 90% | 86.0% |
| Glen Head, NY | 4,860 | 89% | 85.2% |
| Greenlawn, NY | 14,208 | 78% | 62.4% |
| City | Population | Avg. Test Scores | National Avg. |
| Hugo, MN | 14,223 | 70% | 45.5% |
| Waycross, GA | 14,188 | 45% | 6.7% |
| Franklin Park, PA | 14,228 | 20% | 58.4% |
| Setauket-East Setauket, NY | 14,174 | 80% | 65.2% |
| Rio Grande City, TX | 14,242 | 46% | 4.7% |
| Greenlawn, NY | 14,208 | 78% | 62.4% |
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