| 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 | 1,393 | 68% | 42.0% |
| Goffstown, NH | 2,930 | 62% | 29.2% |
| Bradford, NH | 317 | 62% | 29.2% |
| Warner, NH | 655 | 52% | 8.3% |
| Concord, NH | 45,076 | 50% | 3.9% |
| Henniker, NH | 2,660 | 53% | 9.4% |
| City | Population | Avg. Test Scores | National Avg. |
| Fillmore, UT | 2,660 | 44% | 9.4% |
| Webster County, GA | 2,660 | 36% | 25.0% |
| Madrid, IA | 2,660 | 70% | 45.1% |
| Swedesboro, NJ | 2,661 | 53% | 10.4% |
| Carrollton, IL | 2,661 | 29% | 40.6% |
| Henniker, NH | 2,660 | 53% | 9.4% |