| Index | Green Island | New York | National |
| Average Test Scores | 27% | 56% | 48% |
| Student/Teacher ratio | n/a | n/a | 16:1 |
| Total public schools | 1 | 4,060 | 79,221 |
| Total private schools | n/a | 1,092 | 24,874 |
| Total post-secondary schools | n/a | 483 | 7,963 |
| Index | Green Island | New York | National |
| Completed 8th grade | 85.7% | 83.5% | 84.3% |
| Completed high school | 84.3% | 82.1% | 83.0% |
| Completed some college | 53.9% | 59.5% | 59.4% |
| Completed associate degree | 33.6% | 43.4% | 38.5% |
| Completed bachelors | 17.1% | 34.7% | 30.3% |
| Completed masters | 3.6% | 15.1% | 11.5% |
| Completed professional degree | 1.1% | 4.2% | 3.3% |
| Completed doctorate | 0.8% | 1.5% | 1.3% |
There are a total of 1 public schools, n/a private schools and n/a post-secondary schools in Green Island. Using the proficiency score averages, the average test scores for Green Island, NY schools is 27%. The average student to teacher ratio is n/a. In Green Island, NY, an average of 85.7% of students have completed 8th grade and an average of 84.3% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Voorheesville, NY | 2,789 | 78% | 63.2% |
| East Greenbush, NY | 6,299 | 74% | 54.5% |
| Averill Park, NY | 1,466 | 74% | 53.8% |
| Poestenkill, NY | 814 | 65% | 34.4% |
| West Sand Lake, NY | 3,391 | 65% | 34.4% |
| Green Island, NY | 2,647 | 27% | 43.8% |
| City | Population | Avg. Test Scores | National Avg. |
| Freer, TX | 2,647 | 37% | 22.9% |
| Hamburg, AR | 2,647 | 38% | 21.2% |
| Biggs, CA | 2,648 | 26% | 45.3% |
| West Portsmouth, OH | 2,646 | 61% | 27.4% |
| Chewelah, WA | 2,645 | 46% | 3.5% |
| Green Island, NY | 2,647 | 27% | 43.8% |
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