| Index | Holtsville | New York | National |
| Average Test Scores | 46% | 56% | 48% |
| Student/Teacher ratio | n/a | n/a | 16:1 |
| Total public schools | 4 | 4,060 | 79,221 |
| Total private schools | n/a | 1,092 | 24,874 |
| Total post-secondary schools | n/a | 483 | 7,963 |
| Index | Holtsville | New York | National |
| Completed 8th grade | 90.1% | 83.5% | 84.3% |
| Completed high school | 89.8% | 82.1% | 83.0% |
| Completed some college | 63.0% | 59.5% | 59.4% |
| Completed associate degree | 40.0% | 43.4% | 38.5% |
| Completed bachelors | 29.8% | 34.7% | 30.3% |
| Completed masters | 12.3% | 15.1% | 11.5% |
| Completed professional degree | 2.2% | 4.2% | 3.3% |
| Completed doctorate | 1.1% | 1.5% | 1.3% |
There are a total of 4 public schools, n/a private schools and n/a post-secondary schools in Holtsville. Using the proficiency score averages, the average test scores for Holtsville, NY schools is 46%. The average student to teacher ratio is n/a. In Holtsville, NY, an average of 90.1% of students have completed 8th grade and an average of 89.8% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Shoreham, NY | 390 | 82% | 69.8% |
| West Sayville, NY | 5,133 | 82% | 69.8% |
| Hauppauge, NY | 20,417 | 80% | 66.3% |
| Setauket-East Setauket, NY | 14,614 | 80% | 65.6% |
| Port Jefferson, NY | 8,248 | 77% | 60.8% |
| Holtsville, NY | 19,035 | 46% | 3.6% |
| City | Population | Avg. Test Scores | National Avg. |
| Springboro, OH | 19,037 | 82% | 70.3% |
| Thomasville, GA | 19,040 | 36% | 26.0% |
| Niles, OH | 19,041 | 59% | 22.6% |
| Sartell, MN | 19,015 | 64% | 32.5% |
| Lake Ronkonkoma, NY | 19,057 | 65% | 34.4% |
| Holtsville, NY | 19,035 | 46% | 3.6% |
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