| Index | Old Westbury | New York | National |
| Average Test Scores | 91% | 56% | 48% |
| Student/Teacher ratio | n/a | n/a | 16:1 |
| Total public schools | 2 | 4,060 | 79,221 |
| Total private schools | 2 | 1,092 | 24,874 |
| Total post-secondary schools | 2 | 483 | 7,963 |
| Index | Old Westbury | New York | National |
| Completed 8th grade | 96.4% | 83.5% | 84.3% |
| Completed high school | 96.3% | 82.1% | 83.0% |
| Completed some college | 85.8% | 59.5% | 59.4% |
| Completed associate degree | 80.9% | 43.4% | 38.5% |
| Completed bachelors | 74.3% | 34.7% | 30.3% |
| Completed masters | 43.6% | 15.1% | 11.5% |
| Completed professional degree | 27.4% | 4.2% | 3.3% |
| Completed doctorate | 7.2% | 1.5% | 1.3% |
There are a total of 2 public schools, 2 private schools and 2 post-secondary schools in Old Westbury. Using the proficiency score averages, the average test scores for Old Westbury, NY schools is 91%. The average student to teacher ratio is n/a. In Old Westbury, NY, an average of 96.4% of students have completed 8th grade and an average of 96.3% 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% |
| Jericho, NY | 13,928 | 90% | 87.1% |
| Old Bethpage, NY | 5,450 | 90% | 86.5% |
| Glen Head, NY | 4,843 | 89% | 85.7% |
| Old Westbury, NY | 4,618 | 91% | 88.5% |
| City | Population | Avg. Test Scores | National Avg. |
| Cobleskill, NY | 4,616 | 40% | 17.7% |
| Danville, PA | 4,613 | 72% | 49.0% |
| Whitehouse, OH | 4,624 | 86% | 78.9% |
| Phoenix, OR | 4,624 | 38% | 21.2% |
| New Boston, TX | 4,625 | 42% | 12.2% |
| Old Westbury, NY | 4,618 | 91% | 88.5% |
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