| Index | Terryville | New York | National |
| Average Test Scores | 40% | 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 |


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| Index | Terryville | New York | National |
| Completed 8th grade | 86.5% | 83.5% | 84.3% |
| Completed high school | 85.6% | 82.1% | 83.0% |
| Completed some college | 59.4% | 59.5% | 59.4% |
| Completed associate degree | 42.5% | 43.4% | 38.5% |
| Completed bachelors | 34.6% | 34.7% | 30.3% |
| Completed masters | 13.8% | 15.1% | 11.5% |
| Completed professional degree | 2.8% | 4.2% | 3.3% |
| Completed doctorate | 0.3% | 1.5% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Terryville. Using the proficiency score averages, the average test scores for Terryville, NY schools is 40%. The average student to teacher ratio is n/a. In Terryville, NY, an average of 86.5% of students have completed 8th grade and an average of 85.6% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| West Sayville, NY | 5,133 | 82% | 69.8% |
| Shoreham, NY | 390 | 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% |
| Terryville, NY | 11,698 | 40% | 17.7% |
| City | Population | Avg. Test Scores | National Avg. |
| Lawrenceburg, KY | 11,704 | 44% | 9.0% |
| Tarrytown, NY | 11,705 | 54% | 11.5% |
| Urbana, OH | 11,687 | 58% | 21.2% |
| Ravenna, OH | 11,685 | 57% | 19.2% |
| Roma, TX | 11,681 | 64% | 33.2% |
| Terryville, NY | 11,698 | 40% | 17.7% |