| Index | Middle Island | New York | National |
| Average Test Scores | 59% | 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 | Middle Island | New York | National |
| Completed 8th grade | 90.2% | 83.5% | 84.3% |
| Completed high school | 89.1% | 82.1% | 83.0% |
| Completed some college | 59.6% | 59.5% | 59.4% |
| Completed associate degree | 36.0% | 43.4% | 38.5% |
| Completed bachelors | 28.4% | 34.7% | 30.3% |
| Completed masters | 12.4% | 15.1% | 11.5% |
| Completed professional degree | 3.1% | 4.2% | 3.3% |
| Completed doctorate | 1.5% | 1.5% | 1.3% |
There are a total of 4 public schools, n/a private schools and n/a post-secondary schools in Middle Island. Using the proficiency score averages, the average test scores for Middle Island, NY schools is 59%. The average student to teacher ratio is n/a. In Middle Island, NY, an average of 90.2% of students have completed 8th grade and an average of 89.1% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| West Sayville, NY | 4,956 | 82% | 69.8% |
| Shoreham, NY | 375 | 82% | 69.8% |
| Hauppauge, NY | 19,661 | 80% | 66.3% |
| Setauket-East Setauket, NY | 14,174 | 80% | 65.6% |
| Port Jefferson, NY | 8,016 | 77% | 60.8% |
| Middle Island, NY | 11,030 | 59% | 23.7% |
| City | Population | Avg. Test Scores | National Avg. |
| Ontario, OR | 11,031 | 36% | 24.3% |
| Spencer, IA | 11,038 | 79% | 63.5% |
| New Baltimore, VA | 11,017 | 86% | 78.1% |
| Picayune, MS | 11,016 | 44% | 8.2% |
| Franklin Lakes, NJ | 11,044 | 76% | 57.7% |
| Middle Island, NY | 11,030 | 59% | 23.7% |
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