| Index | Hewlett Harbor | New York | National |
| Average Test Scores | n/a | 56% | 48% |
| Student/Teacher ratio | n/a | n/a | 16:1 |
| Total public schools | n/a | 4,060 | 79,221 |
| Total private schools | n/a | 1,092 | 24,874 |
| Total post-secondary schools | n/a | 483 | 7,963 |
| Index | Hewlett Harbor | New York | National |
| Completed 8th grade | 98.6% | 83.5% | 84.3% |
| Completed high school | 98.6% | 82.1% | 83.0% |
| Completed some college | 90.8% | 59.5% | 59.4% |
| Completed associate degree | 77.2% | 43.4% | 38.5% |
| Completed bachelors | 73.1% | 34.7% | 30.3% |
| Completed masters | 40.9% | 15.1% | 11.5% |
| Completed professional degree | 21.4% | 4.2% | 3.3% |
| Completed doctorate | 2.9% | 1.5% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Hewlett Harbor. Using the proficiency score averages, the average test scores for Hewlett Harbor, NY schools is n/a. The average student to teacher ratio is n/a. In Hewlett Harbor, NY, an average of 98.6% of students have completed 8th grade and an average of 98.6% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Sea Cliff, NY | 5,212 | 92% | 91.7% |
| Cedarhurst, NY | 6,786 | 91% | 89.6% |
| Old Westbury, NY | 4,784 | 91% | 88.5% |
| Jericho, NY | 14,448 | 90% | 87.1% |
| Old Bethpage, NY | 5,640 | 90% | 86.5% |
| Hewlett Harbor, NY | 981 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Van Horne, IA | 981 | 73% | 51.6% |
| Six Mile, SC | 981 | 61% | 26.0% |
| Elwood, KS | 980 | 25% | 49.0% |
| Wolcottville, IN | 982 | 32% | 33.3% |
| Owen, WI | 982 | 29% | 39.6% |
| Hewlett Harbor, NY | 981 | n/a |
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