| Index | Mount Joy | Pennsylvania | National |
| Average Test Scores | 64% | 55% | 48% |
| Student/Teacher ratio | 16:1 | 16:1 | 16:1 |
| Total public schools | 7 | 2,563 | 79,221 |
| Total private schools | 4 | 1,626 | 24,874 |
| Total post-secondary schools | 1 | 406 | 7,963 |
| Index | Mount Joy | Pennsylvania | National |
| Completed 8th grade | 86.9% | 86.9% | 84.3% |
| Completed high school | 84.4% | 85.6% | 83.0% |
| Completed some college | 46.7% | 53.6% | 59.4% |
| Completed associate degree | 33.4% | 37.4% | 38.5% |
| Completed bachelors | 24.2% | 29.3% | 30.3% |
| Completed masters | 9.7% | 11.5% | 11.5% |
| Completed professional degree | 1.7% | 3.3% | 3.3% |
| Completed doctorate | 0.5% | 1.4% | 1.3% |
There are a total of 7 public schools, 4 private schools and 1 post-secondary schools in Mount Joy. Using the proficiency score averages, the average test scores for Mount Joy, PA schools is 64%. The average student to teacher ratio is 16:1. In Mount Joy, PA, an average of 86.9% of students have completed 8th grade and an average of 84.4% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Bainbridge, PA | 1,399 | 84% | 75.0% |
| York Haven, PA | 819 | 77% | 60.4% |
| Hershey, PA | 14,941 | 76% | 57.7% |
| Palmyra, PA | 7,541 | 75% | 56.6% |
| Conestoga, PA | 1,128 | 75% | 55.2% |
| Mount Joy, PA | 8,204 | 64% | 33.0% |
| City | Population | Avg. Test Scores | National Avg. |
| Westlake Village, CA | 8,203 | 65% | 34.8% |
| Carl Junction, MO | 8,202 | 49% | 1.7% |
| Lockwood, MT | 8,206 | 30% | 37.0% |
| Stayton, OR | 8,199 | 48% | = 100 |
| Nevada, MO | 8,198 | 41% | 15.4% |
| Mount Joy, PA | 8,204 | 64% | 33.0% |
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