| Index | Thornwood | New York | National |
| Average Test Scores | 76% | 56% | 48% |
| Student/Teacher ratio | n/a | n/a | 16:1 |
| Total public schools | 3 | 4,060 | 79,221 |
| Total private schools | n/a | 1,092 | 24,874 |
| Total post-secondary schools | n/a | 483 | 7,963 |
| Index | Thornwood | New York | National |
| Completed 8th grade | 89.5% | 83.5% | 84.3% |
| Completed high school | 88.7% | 82.1% | 83.0% |
| Completed some college | 66.9% | 59.5% | 59.4% |
| Completed associate degree | 54.3% | 43.4% | 38.5% |
| Completed bachelors | 46.4% | 34.7% | 30.3% |
| Completed masters | 21.6% | 15.1% | 11.5% |
| Completed professional degree | 5.1% | 4.2% | 3.3% |
| Completed doctorate | 1.1% | 1.5% | 1.3% |
There are a total of 3 public schools, n/a private schools and n/a post-secondary schools in Thornwood. Using the proficiency score averages, the average test scores for Thornwood, NY schools is 76%. The average student to teacher ratio is n/a. In Thornwood, NY, an average of 89.5% of students have completed 8th grade and an average of 88.7% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Lincolndale, NY | 1,407 | 99% | 105.2% |
| Orangeburg, NY | 4,454 | 98% | 103.1% |
| Shrub Oak, NY | 3,094 | 97% | 102.1% |
| Bronxville, NY | 6,450 | 88% | 82.3% |
| Scarsdale, NY | 17,890 | 87% | 81.8% |
| Thornwood, NY | 4,484 | 76% | 57.3% |
| City | Population | Avg. Test Scores | National Avg. |
| Bremen, IN | 4,484 | 53% | 10.4% |
| Whiteville, TN | 4,482 | 15% | 69.8% |
| La Vale, MD | 4,486 | 62% | 29.2% |
| Rockford, MN | 4,481 | 66% | 37.8% |
| Mount Vernon, IA | 4,487 | 82% | 71.5% |
| Thornwood, NY | 4,484 | 76% | 57.3% |
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