| Index | Three Mile Bay | 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 | Three Mile Bay | New York | National |
| Completed 8th grade | 88.7% | 83.5% | 84.3% |
| Completed high school | 88.7% | 82.1% | 83.0% |
| Completed some college | 20.0% | 59.5% | 59.4% |
| Completed associate degree | 20.0% | 43.4% | 38.5% |
| Completed bachelors | 20.0% | 34.7% | 30.3% |
| Completed masters | 16.5% | 15.1% | 11.5% |
| Completed professional degree | 3.5% | 4.2% | 3.3% |
| Completed doctorate | 0.0% | 1.5% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Three Mile Bay. Using the proficiency score averages, the average test scores for Three Mile Bay, NY schools is n/a. The average student to teacher ratio is n/a. In Three Mile Bay, NY, an average of 88.7% of students have completed 8th grade and an average of 88.7% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Clayton, NY | 1,932 | 65% | 34.4% |
| Sackets Harbor, NY | 1,550 | 58% | 20.8% |
| La Fargeville, NY | 733 | 57% | 17.7% |
| Cape Vincent, NY | 525 | 55% | 14.6% |
| Chaumont, NY | 702 | 55% | 13.5% |
| Three Mile Bay, NY | 182 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Green Mountain, IA | 182 | 75% | 55.2% |
| Kelly, WY | 183 | 70% | 45.8% |
| Castleford, ID | 181 | 32% | 33.3% |
| Carpenter, WY | 181 | 50% | 4.2% |
| Marion, ND | 181 | 60% | 25.0% |
| Three Mile Bay, NY | 182 | n/a |
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