| Index | Henniker | New Hampshire | National |
| Average Test Scores | 53% | 52% | 48% |
| Student/Teacher ratio | 11:1 | 13:1 | 16:1 |
| Total public schools | 1 | 234 | 79,221 |
| Total private schools | n/a | 144 | 24,874 |
| Total post-secondary schools | 1 | 40 | 7,963 |
| Index | Henniker | New Hampshire | National |
| Completed 8th grade | 87.7% | 89.5% | 84.3% |
| Completed high school | 86.5% | 88.4% | 83.0% |
| Completed some college | 70.2% | 64.2% | 59.4% |
| Completed associate degree | 55.1% | 45.3% | 38.5% |
| Completed bachelors | 38.4% | 35.5% | 30.3% |
| Completed masters | 10.8% | 13.4% | 11.5% |
| Completed professional degree | 5.8% | 3.3% | 3.3% |
| Completed doctorate | 2.3% | 1.4% | 1.3% |
There are a total of 1 public schools, n/a private schools and 1 post-secondary schools in Henniker. Using the proficiency score averages, the average test scores for Henniker, NH schools is 53%. The average student to teacher ratio is 11:1. In Henniker, NH, an average of 87.7% of students have completed 8th grade and an average of 86.5% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Contoocook, NH | 1,353 | 68% | 42.0% |
| Bradford, NH | 306 | 62% | 29.2% |
| Goffstown, NH | 2,848 | 62% | 29.2% |
| Warner, NH | 638 | 52% | 8.3% |
| Concord, NH | 43,503 | 50% | 3.9% |
| Henniker, NH | 2,566 | 53% | 9.4% |
| City | Population | Avg. Test Scores | National Avg. |
| Graniteville, SC | 2,566 | 42% | 13.2% |
| Mattawan, MI | 2,567 | 64% | 32.3% |
| Crystal Lake, CT | 2,567 | 60% | 24.0% |
| Alden, NY | 2,565 | 66% | 36.8% |
| Pembroke, GA | 2,565 | 35% | 26.4% |
| Henniker, NH | 2,566 | 53% | 9.4% |
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