| Index | Marietta | Texas | National |
| Average Test Scores | n/a | 47% | 48% |
| Student/Teacher ratio | n/a | 14:1 | 16:1 |
| Total public schools | n/a | 7,418 | 79,221 |
| Total private schools | n/a | 1,267 | 24,874 |
| Total post-secondary schools | n/a | 463 | 7,963 |
| Index | Marietta | Texas | National |
| Completed 8th grade | 76.0% | 79.3% | 84.3% |
| Completed high school | 72.0% | 77.8% | 83.0% |
| Completed some college | 30.0% | 57.3% | 59.4% |
| Completed associate degree | 19.0% | 34.9% | 38.5% |
| Completed bachelors | 16.0% | 28.1% | 30.3% |
| Completed masters | 5.0% | 9.6% | 11.5% |
| Completed professional degree | 0.0% | 2.6% | 3.3% |
| Completed doctorate | 0.0% | 1.1% | 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, TX schools is n/a. The average student to teacher ratio is n/a. In Marietta, TX, an average of 76.0% of students have completed 8th grade and an average of 72.0% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Hughes Springs, TX | 1,534 | 54% | 12.8% |
| Maud, TX | 1,196 | 44% | 8.3% |
| Linden, TX | 2,238 | 37% | 23.6% |
| Daingerfield, TX | 2,679 | 35% | 28.1% |
| Omaha, TX | 1,131 | 34% | 29.2% |
| Marietta, TX | 90 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Panola, OK | 90 | 38% | 21.9% |
| King and Queen Court House, VA | 90 | 77% | 60.4% |
| Solen, ND | 90 | 10% | 79.2% |
| Fort Ransom, ND | 89 | 50% | 4.2% |
| Chuathbaluk, AK | 89 | 50% | 4.2% |
| Marietta, TX | 90 | n/a |
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