| Index | Hewlett | New York | National |
| Average Test Scores | 82% | 56% | 48% |
| Student/Teacher ratio | n/a | n/a | 16:1 |
| Total public schools | 4 | 4,060 | 79,221 |
| Total private schools | 3 | 1,092 | 24,874 |
| Total post-secondary schools | n/a | 483 | 7,963 |
| Index | Hewlett | New York | National |
| Completed 8th grade | 94.7% | 83.5% | 84.3% |
| Completed high school | 93.8% | 82.1% | 83.0% |
| Completed some college | 70.6% | 59.5% | 59.4% |
| Completed associate degree | 55.0% | 43.4% | 38.5% |
| Completed bachelors | 50.8% | 34.7% | 30.3% |
| Completed masters | 24.6% | 15.1% | 11.5% |
| Completed professional degree | 10.2% | 4.2% | 3.3% |
| Completed doctorate | 1.0% | 1.5% | 1.3% |
There are a total of 4 public schools, 3 private schools and n/a post-secondary schools in Hewlett. Using the proficiency score averages, the average test scores for Hewlett, NY schools is 82%. The average student to teacher ratio is n/a. In Hewlett, NY, an average of 94.7% of students have completed 8th grade and an average of 93.8% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Sea Cliff, NY | 5,045 | 92% | 91.7% |
| Cedarhurst, NY | 6,642 | 91% | 89.6% |
| Old Westbury, NY | 4,618 | 91% | 88.5% |
| Jericho, NY | 13,928 | 90% | 87.1% |
| Old Bethpage, NY | 5,450 | 90% | 86.5% |
| Hewlett, NY | 7,064 | 82% | 70.5% |
| City | Population | Avg. Test Scores | National Avg. |
| Cos Cob, CT | 7,065 | 73% | 52.1% |
| Delphos, OH | 7,066 | 82% | 70.1% |
| Hudson Falls, NY | 7,067 | 51% | 5.7% |
| Morrow, GA | 7,061 | 32% | 33.8% |
| Atherton, CA | 7,060 | 70% | 45.8% |
| Hewlett, NY | 7,064 | 82% | 70.5% |
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