| Index | Marietta | Pennsylvania | National |
| Average Test Scores | 56% | 55% | 48% |
| Student/Teacher ratio | 15:1 | 16:1 | 16:1 |
| Total public schools | 2 | 2,563 | 79,221 |
| Total private schools | 1 | 1,626 | 24,874 |
| Total post-secondary schools | n/a | 406 | 7,963 |
| Index | Marietta | Pennsylvania | National |
| Completed 8th grade | 81.0% | 86.9% | 84.3% |
| Completed high school | 80.7% | 85.6% | 83.0% |
| Completed some college | 41.6% | 53.6% | 59.4% |
| Completed associate degree | 25.5% | 37.4% | 38.5% |
| Completed bachelors | 19.0% | 29.3% | 30.3% |
| Completed masters | 4.0% | 11.5% | 11.5% |
| Completed professional degree | 1.0% | 3.3% | 3.3% |
| Completed doctorate | 0.6% | 1.4% | 1.3% |
There are a total of 2 public schools, 1 private schools and n/a post-secondary schools in Marietta. Using the proficiency score averages, the average test scores for Marietta, PA schools is 56%. The average student to teacher ratio is 15:1. In Marietta, PA, an average of 81.0% of students have completed 8th grade and an average of 80.7% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Bainbridge, PA | 1,440 | 84% | 75.0% |
| York Haven, PA | 848 | 77% | 60.4% |
| Conestoga, PA | 1,152 | 75% | 55.2% |
| Millersville, PA | 8,625 | 74% | 54.7% |
| Wrightsville, PA | 2,124 | 72% | 50.3% |
| Marietta, PA | 2,687 | 56% | 16.7% |
| City | Population | Avg. Test Scores | National Avg. |
| West Fork, AR | 2,687 | 41% | 14.6% |
| Parsons, TN | 2,686 | 41% | 14.6% |
| Dillsburg, PA | 2,688 | 59% | 22.5% |
| Okolona, MS | 2,689 | 30% | 38.2% |
| Conrad, MT | 2,685 | 41% | 14.2% |
| Marietta, PA | 2,687 | 56% | 16.7% |
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