| Index | Poestenkill | New York | National |
| Average Test Scores | 65% | 56% | 48% |
| Student/Teacher ratio | n/a | n/a | 16:1 |
| Total public schools | 1 | 4,060 | 79,221 |
| Total private schools | n/a | 1,092 | 24,874 |
| Total post-secondary schools | n/a | 483 | 7,963 |
| Index | Poestenkill | New York | National |
| Completed 8th grade | 92.8% | 83.5% | 84.3% |
| Completed high school | 92.8% | 82.1% | 83.0% |
| Completed some college | 58.1% | 59.5% | 59.4% |
| Completed associate degree | 40.3% | 43.4% | 38.5% |
| Completed bachelors | 21.2% | 34.7% | 30.3% |
| Completed masters | 14.5% | 15.1% | 11.5% |
| Completed professional degree | 0.0% | 4.2% | 3.3% |
| Completed doctorate | 0.0% | 1.5% | 1.3% |
There are a total of 1 public schools, n/a private schools and n/a post-secondary schools in Poestenkill. Using the proficiency score averages, the average test scores for Poestenkill, NY schools is 65%. The average student to teacher ratio is n/a. In Poestenkill, NY, an average of 92.8% of students have completed 8th grade and an average of 92.8% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| East Greenbush, NY | 6,299 | 74% | 54.5% |
| Averill Park, NY | 1,466 | 74% | 53.8% |
| West Sand Lake, NY | 3,391 | 65% | 34.4% |
| Nassau, NY | 1,125 | 62% | 29.2% |
| Waterford, NY | 2,141 | 58% | 21.4% |
| Poestenkill, NY | 814 | 65% | 34.4% |
| City | Population | Avg. Test Scores | National Avg. |
| Adair, IA | 814 | 81% | 68.2% |
| Roy, WA | 814 | 47% | 2.1% |
| Ravensdale, WA | 814 | 72% | 49.0% |
| Science Hill, KY | 814 | 64% | 32.3% |
| Keysville, VA | 814 | 92% | 91.7% |
| Poestenkill, NY | 814 | 65% | 34.4% |
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