| Index | Marietta | Mississippi | National |
| Average Test Scores | 72% | 40% | 48% |
| Student/Teacher ratio | n/a | 16:1 | 16:1 |
| Total public schools | n/a | 893 | 79,221 |
| Total private schools | n/a | 206 | 24,874 |
| Total post-secondary schools | n/a | 68 | 7,963 |
| Index | Marietta | Mississippi | National |
| Completed 8th grade | 84.2% | 78.6% | 84.3% |
| Completed high school | 83.7% | 76.7% | 83.0% |
| Completed some college | 54.3% | 52.5% | 59.4% |
| Completed associate degree | 24.5% | 29.8% | 38.5% |
| Completed bachelors | 16.8% | 21.0% | 30.3% |
| Completed masters | 7.1% | 7.9% | 11.5% |
| Completed professional degree | 1.6% | 2.2% | 3.3% |
| Completed doctorate | 0.5% | 0.9% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Marietta. Using the proficiency score averages, the average test scores for Marietta, MS schools is 72%. The average student to teacher ratio is n/a. In Marietta, MS, an average of 84.2% of students have completed 8th grade and an average of 83.7% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Booneville, MS | 8,539 | 57% | 18.2% |
| Saltillo, MS | 5,026 | 50% | 4.2% |
| Baldwyn, MS | 3,093 | 50% | 3.6% |
| Mantachie, MS | 1,726 | 49% | 2.1% |
| Guntown, MS | 2,757 | 48% | 1.0% |
| Marietta, MS | 208 | 72% | 50.0% |
| City | Population | Avg. Test Scores | National Avg. |
| Okabena, MN | 208 | 35% | 27.1% |
| White Shield, ND | 208 | 25% | 48.6% |
| Karns City, PA | 208 | 64% | 33.3% |
| Kaltag, AK | 209 | 50% | 4.2% |
| Glendo, WY | 209 | 50% | 4.2% |
| Marietta, MS | 208 | 72% | 50.0% |
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