| Index | Holbrook | New York | National |
| Average Test Scores | 48% | 56% | 48% |
| Student/Teacher ratio | n/a | n/a | 16:1 |
| Total public schools | 4 | 4,060 | 79,221 |
| Total private schools | 1 | 1,092 | 24,874 |
| Total post-secondary schools | n/a | 483 | 7,963 |
| Index | Holbrook | New York | National |
| Completed 8th grade | 92.2% | 83.5% | 84.3% |
| Completed high school | 92.0% | 82.1% | 83.0% |
| Completed some college | 62.9% | 59.5% | 59.4% |
| Completed associate degree | 43.4% | 43.4% | 38.5% |
| Completed bachelors | 33.4% | 34.7% | 30.3% |
| Completed masters | 16.0% | 15.1% | 11.5% |
| Completed professional degree | 2.5% | 4.2% | 3.3% |
| Completed doctorate | 0.8% | 1.5% | 1.3% |
There are a total of 4 public schools, 1 private schools and n/a post-secondary schools in Holbrook. Using the proficiency score averages, the average test scores for Holbrook, NY schools is 48%. The average student to teacher ratio is n/a. In Holbrook, NY, an average of 92.2% of students have completed 8th grade and an average of 92.0% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Shoreham, NY | 375 | 82% | 69.8% |
| West Sayville, NY | 4,956 | 82% | 69.8% |
| Hauppauge, NY | 19,661 | 80% | 66.3% |
| Setauket-East Setauket, NY | 14,174 | 80% | 65.6% |
| Elwood, NY | 11,582 | 79% | 63.5% |
| Holbrook, NY | 25,794 | 48% | 1.0% |
| City | Population | Avg. Test Scores | National Avg. |
| Lebanon, PA | 25,779 | 45% | 5.9% |
| Kankakee, IL | 25,818 | 22% | 54.5% |
| Mercer Island, WA | 25,820 | 85% | 77.8% |
| Mauldin, SC | 25,829 | 69% | 42.7% |
| Hanahan, SC | 25,743 | 58% | 20.8% |
| Holbrook, NY | 25,794 | 48% | 1.0% |
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