| Index | Mendham | New Jersey | National |
| Average Test Scores | 79% | 52% | 48% |
| Student/Teacher ratio | 13:1 | 13:1 | 16:1 |
| Total public schools | 3 | 1,604 | 79,221 |
| Total private schools | 3 | 823 | 24,874 |
| Total post-secondary schools | 1 | 157 | 7,963 |
| Index | Mendham | New Jersey | National |
| Completed 8th grade | 98.1% | 87.5% | 84.3% |
| Completed high school | 97.9% | 86.3% | 83.0% |
| Completed some college | 84.9% | 60.7% | 59.4% |
| Completed associate degree | 71.6% | 43.9% | 38.5% |
| Completed bachelors | 66.9% | 37.5% | 30.3% |
| Completed masters | 29.6% | 14.4% | 11.5% |
| Completed professional degree | 8.7% | 4.0% | 3.3% |
| Completed doctorate | 1.9% | 1.5% | 1.3% |
There are a total of 3 public schools, 3 private schools and 1 post-secondary schools in Mendham. Using the proficiency score averages, the average test scores for Mendham, NJ schools is 79%. The average student to teacher ratio is 13:1. In Mendham, NJ, an average of 98.1% of students have completed 8th grade and an average of 97.9% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Short Hills, NJ | 12,771 | 83% | 73.3% |
| Mountain Lakes, NJ | 4,287 | 83% | 72.2% |
| Summit, NJ | 21,895 | 81% | 68.9% |
| Bradley Gardens, NJ | 14,413 | 81% | 67.8% |
| New Providence, NJ | 12,434 | 80% | 66.0% |
| Mendham, NJ | 5,012 | 79% | 63.1% |
| City | Population | Avg. Test Scores | National Avg. |
| Port Isabel, TX | 5,015 | 39% | 18.4% |
| Sheldon, IA | 5,015 | 76% | 57.9% |
| Mayville, WI | 5,016 | 41% | 15.8% |
| Harlan, IA | 5,008 | 81% | 67.6% |
| Demarest, NJ | 5,007 | 80% | 66.9% |
| Mendham, NJ | 5,012 | 79% | 63.1% |
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