| Index | Cornwall-on-Hudson | New York | National |
| Average Test Scores | 52% | 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 | Cornwall-on-Hudson | New York | National |
| Completed 8th grade | 91.7% | 83.5% | 84.3% |
| Completed high school | 91.7% | 82.1% | 83.0% |
| Completed some college | 74.3% | 59.5% | 59.4% |
| Completed associate degree | 57.2% | 43.4% | 38.5% |
| Completed bachelors | 47.1% | 34.7% | 30.3% |
| Completed masters | 24.7% | 15.1% | 11.5% |
| Completed professional degree | 5.1% | 4.2% | 3.3% |
| Completed doctorate | 2.7% | 1.5% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Cornwall-on-Hudson. Using the proficiency score averages, the average test scores for Cornwall-on-Hudson, NY schools is 52%. The average student to teacher ratio is n/a. In Cornwall-on-Hudson, NY, an average of 91.7% of students have completed 8th grade and an average of 91.7% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Lincolndale, NY | 1,407 | 99% | 105.2% |
| Shrub Oak, NY | 3,094 | 97% | 102.1% |
| Fort Montgomery, NY | 1,867 | 94% | 94.8% |
| Cold Spring, NY | 1,911 | 81% | 68.2% |
| Firthcliffe, NY | 5,051 | 77% | 60.4% |
| Cornwall-on-Hudson, NY | 2,926 | 52% | 8.3% |
| City | Population | Avg. Test Scores | National Avg. |
| Boxford, MA | 2,925 | 72% | 50.3% |
| Houston, MO | 2,927 | 32% | 33.0% |
| Sandwich, MA | 2,928 | 57% | 18.8% |
| Frisco, CO | 2,928 | 38% | 21.9% |
| Savanna, IL | 2,924 | 23% | 51.6% |
| Cornwall-on-Hudson, NY | 2,926 | 52% | 8.3% |
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