| Index | Henniker | New Hampshire | National |
| Average Test Scores | 68% | 52% | 49% |
| 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 68%. 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, State | Population | Avg. Test Scores | National Avg. |
| Hancock, NH | 201 | 70% | 41% |
| Contoocook, NH | 1,773 | 65% | 32% |
| Bradford, NH | 326 | 62% | 26% |
| Goffstown, NH | 3,225 | 61% | 24% |
| Warner, NH | 473 | 55% | 11% |
| Henniker, NH | 1,598 | 68% | 37% |
| City, State | Population | Avg. Test Scores | National Avg. |
| Corning, IA | 1,598 | 78% | 59% |
| Terra Alta, WV | 1,598 | 27% | 46% |
| Siletz, OR | 1,599 | 40% | 19% |
| Stanfield, NC | 1,597 | 50% | 1% |
| Port Gibson, MS | 1,597 | 16% | 68% |
| Henniker, NH | 1,598 | 68% | 37% |
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