| Index | Mercersburg | Pennsylvania | National |
| Average Test Scores | 62% | 55% | 48% |
| Student/Teacher ratio | 15:1 | 16:1 | 16:1 |
| Total public schools | 5 | 2,563 | 79,221 |
| Total private schools | 2 | 1,626 | 24,874 |
| Total post-secondary schools | n/a | 406 | 7,963 |
| Index | Mercersburg | Pennsylvania | National |
| Completed 8th grade | 79.7% | 86.9% | 84.3% |
| Completed high school | 78.0% | 85.6% | 83.0% |
| Completed some college | 41.7% | 53.6% | 59.4% |
| Completed associate degree | 27.8% | 37.4% | 38.5% |
| Completed bachelors | 20.3% | 29.3% | 30.3% |
| Completed masters | 11.6% | 11.5% | 11.5% |
| Completed professional degree | 2.6% | 3.3% | 3.3% |
| Completed doctorate | 1.9% | 1.4% | 1.3% |
There are a total of 5 public schools, 2 private schools and n/a post-secondary schools in Mercersburg. Using the proficiency score averages, the average test scores for Mercersburg, PA schools is 62%. The average student to teacher ratio is 15:1. In Mercersburg, PA, an average of 79.7% of students have completed 8th grade and an average of 78.0% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Greencastle, PA | 4,008 | 69% | 44.4% |
| McConnellsburg, PA | 1,030 | 63% | 31.6% |
| Chambersburg, PA | 21,017 | 57% | 18.1% |
| Clear Spring, MD | 486 | 55% | 13.9% |
| Hagerstown, MD | 40,027 | 44% | 8.8% |
| Mercersburg, PA | 1,673 | 62% | 29.0% |
| City | Population | Avg. Test Scores | National Avg. |
| Plainville, KS | 1,673 | 32% | 33.3% |
| Chepachet, RI | 1,673 | 57% | 18.8% |
| Holliday, TX | 1,673 | 68% | 40.6% |
| Evart, MI | 1,673 | 32% | 32.7% |
| Waterville, NY | 1,672 | 62% | 29.2% |
| Mercersburg, PA | 1,673 | 62% | 29.0% |
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