| Index | Smithtown | New York | National |
| Average Test Scores | 67% | 56% | 48% |
| Student/Teacher ratio | n/a | n/a | 16:1 |
| Total public schools | 9 | 4,060 | 79,221 |
| Total private schools | 4 | 1,092 | 24,874 |
| Total post-secondary schools | n/a | 483 | 7,963 |
| Index | Smithtown | New York | National |
| Completed 8th grade | 92.9% | 83.5% | 84.3% |
| Completed high school | 92.4% | 82.1% | 83.0% |
| Completed some college | 74.4% | 59.5% | 59.4% |
| Completed associate degree | 56.1% | 43.4% | 38.5% |
| Completed bachelors | 46.2% | 34.7% | 30.3% |
| Completed masters | 21.8% | 15.1% | 11.5% |
| Completed professional degree | 4.0% | 4.2% | 3.3% |
| Completed doctorate | 1.0% | 1.5% | 1.3% |
There are a total of 9 public schools, 4 private schools and n/a post-secondary schools in Smithtown. Using the proficiency score averages, the average test scores for Smithtown, NY schools is 67%. The average student to teacher ratio is n/a. In Smithtown, NY, an average of 92.9% of students have completed 8th grade and an average of 92.4% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Old Bethpage, NY | 5,450 | 90% | 86.5% |
| Cold Spring Harbor, NY | 2,864 | 87% | 81.3% |
| Darien, CT | 21,519 | 85% | 76.9% |
| Plainview, NY | 26,267 | 83% | 72.1% |
| Syosset, NY | 19,254 | 83% | 71.9% |
| Smithtown, NY | 26,197 | 67% | 40.4% |
| City | Population | Avg. Test Scores | National Avg. |
| Troy, OH | 26,176 | 71% | 48.1% |
| Clarksburg, MD | 26,234 | 60% | 24.7% |
| Galt, CA | 26,235 | 43% | 10.9% |
| Belmont, MA | 26,158 | 84% | 74.0% |
| Stevens Point, WI | 26,144 | 40% | 16.1% |
| Smithtown, NY | 26,197 | 67% | 40.4% |
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