| Index | Marlborough | New Hampshire | National |
| Average Test Scores | 32% | 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 | n/a | 40 | 7,963 |
| Index | Marlborough | New Hampshire | National |
| Completed 8th grade | 91.7% | 89.5% | 84.3% |
| Completed high school | 90.8% | 88.4% | 83.0% |
| Completed some college | 48.7% | 64.2% | 59.4% |
| Completed associate degree | 31.3% | 45.3% | 38.5% |
| Completed bachelors | 20.9% | 35.5% | 30.3% |
| Completed masters | 5.3% | 13.4% | 11.5% |
| Completed professional degree | 1.7% | 3.3% | 3.3% |
| Completed doctorate | 1.1% | 1.4% | 1.3% |
There are a total of 1 public schools, n/a private schools and n/a post-secondary schools in Marlborough. Using the proficiency score averages, the average test scores for Marlborough, NH schools is 32%. The average student to teacher ratio is 11:1. In Marlborough, NH, an average of 91.7% of students have completed 8th grade and an average of 90.8% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Walpole, NH | 647 | 60% | 24.0% |
| Northfield, MA | 970 | 55% | 13.5% |
| Jaffrey, NH | 2,750 | 50% | 3.1% |
| Peterborough, NH | 2,704 | 49% | 2.4% |
| Keene, NH | 22,823 | 46% | 4.2% |
| Marlborough, NH | 1,093 | 32% | 33.3% |
| City | Population | Avg. Test Scores | National Avg. |
| Gales Ferry, CT | 1,093 | 52% | 7.3% |
| Bronson, FL | 1,093 | 46% | 4.7% |
| Hector, MN | 1,093 | 50% | 3.1% |
| Monticello, WI | 1,094 | 37% | 22.6% |
| Mendon, IL | 1,092 | 23% | 52.8% |
| Marlborough, NH | 1,093 | 32% | 33.3% |
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