| Index | Marietta | Ohio | National |
| Average Test Scores | 62% | 61% | 48% |
| Student/Teacher ratio | 18:1 | 17:1 | 16:1 |
| Total public schools | 12 | 3,650 | 79,221 |
| Total private schools | 3 | 1,000 | 24,874 |
| Total post-secondary schools | 3 | 393 | 7,963 |
| Index | Marietta | Ohio | National |
| Completed 8th grade | 85.5% | 86.9% | 84.3% |
| Completed high school | 84.4% | 85.6% | 83.0% |
| Completed some college | 52.2% | 55.7% | 59.4% |
| Completed associate degree | 33.2% | 35.1% | 38.5% |
| Completed bachelors | 23.6% | 26.7% | 30.3% |
| Completed masters | 8.4% | 10.0% | 11.5% |
| Completed professional degree | 3.2% | 2.7% | 3.3% |
| Completed doctorate | 1.7% | 1.1% | 1.3% |
There are a total of 12 public schools, 3 private schools and 3 post-secondary schools in Marietta. Using the proficiency score averages, the average test scores for Marietta, OH schools is 62%. The average student to teacher ratio is 18:1. In Marietta, OH, an average of 85.5% of students have completed 8th grade and an average of 84.4% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Little Hocking, OH | 759 | 80% | 65.6% |
| Newport, OH | 1,310 | 77% | 60.4% |
| Lower Salem, OH | 126 | 77% | 60.4% |
| Beverly, OH | 1,520 | 72% | 49.0% |
| Lowell, OH | 538 | 67% | 39.6% |
| Marietta, OH | 13,551 | 62% | 29.8% |
| City | Population | Avg. Test Scores | National Avg. |
| Snoqualmie, WA | 13,550 | 64% | 34.2% |
| Pottsville, PA | 13,549 | 49% | 2.1% |
| Bay St. Louis, MS | 13,539 | 49% | 2.9% |
| Ridge, NY | 13,537 | 57% | 18.8% |
| Federal Heights, CO | 13,537 | 24% | 50.0% |
| Marietta, OH | 13,551 | 62% | 29.8% |
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