| 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% |
Here are the best places to live in Ohio
Check out the 10 safest cities in Ohio
Most Dangerous States In The US
Check out the 10 most dangerous cities in Ohio