| Index | Great River | 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 | n/a | 1,092 | 24,874 |
| Total post-secondary schools | n/a | 483 | 7,963 |
| Index | Great River | New York | National |
| Completed 8th grade | 96.2% | 83.5% | 84.3% |
| Completed high school | 95.5% | 82.1% | 83.0% |
| Completed some college | 78.1% | 59.5% | 59.4% |
| Completed associate degree | 62.5% | 43.4% | 38.5% |
| Completed bachelors | 54.5% | 34.7% | 30.3% |
| Completed masters | 34.3% | 15.1% | 11.5% |
| Completed professional degree | 15.7% | 4.2% | 3.3% |
| Completed doctorate | 4.6% | 1.5% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Great River. Using the proficiency score averages, the average test scores for Great River, NY schools is n/a. The average student to teacher ratio is n/a. In Great River, NY, an average of 96.2% of students have completed 8th grade and an average of 95.5% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| 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% |
| Greenlawn, NY | 14,598 | 78% | 62.8% |
| Great River, NY | 1,961 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Questa, NM | 1,961 | 27% | 43.3% |
| Clinton, NY | 1,961 | 71% | 48.3% |
| Boonville, NY | 1,960 | 58% | 19.8% |
| Sag Harbor, NY | 1,959 | 65% | 34.4% |
| Stillwater, NY | 1,959 | 64% | 32.8% |
| Great River, NY | 1,961 | n/a |
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