| Index | Old Brookville | 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 | 1 | 1,092 | 24,874 |
| Total post-secondary schools | n/a | 483 | 7,963 |
| Index | Old Brookville | New York | National |
| Completed 8th grade | 96.6% | 83.5% | 84.3% |
| Completed high school | 95.6% | 82.1% | 83.0% |
| Completed some college | 88.1% | 59.5% | 59.4% |
| Completed associate degree | 77.8% | 43.4% | 38.5% |
| Completed bachelors | 72.8% | 34.7% | 30.3% |
| Completed masters | 36.6% | 15.1% | 11.5% |
| Completed professional degree | 22.1% | 4.2% | 3.3% |
| Completed doctorate | 3.8% | 1.5% | 1.3% |
There are a total of n/a public schools, 1 private schools and n/a post-secondary schools in Old Brookville. Using the proficiency score averages, the average test scores for Old Brookville, NY schools is n/a. The average student to teacher ratio is n/a. In Old Brookville, NY, an average of 96.6% of students have completed 8th grade and an average of 95.6% 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% |
| Old Brookville, NY | 1,842 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Kingston, OK | 1,842 | 34% | 28.8% |
| Hico, TX | 1,842 | 56% | 16.1% |
| Sugar City, ID | 1,842 | 54% | 11.5% |
| Newburgh Heights, OH | 1,841 | 26% | 45.8% |
| Keenesburg, CO | 1,841 | 35% | 27.6% |
| Old Brookville, NY | 1,842 | n/a |
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