| Index | Marietta | Oklahoma | National |
| Average Test Scores | 22% | 32% | 48% |
| Student/Teacher ratio | n/a | 22:1 | 16:1 |
| Total public schools | n/a | 1,346 | 79,221 |
| Total private schools | n/a | 159 | 24,874 |
| Total post-secondary schools | n/a | 178 | 7,963 |
| Index | Marietta | Oklahoma | National |
| Completed 8th grade | 75.7% | 83.5% | 84.3% |
| Completed high school | 68.3% | 82.2% | 83.0% |
| Completed some college | 31.4% | 55.6% | 59.4% |
| Completed associate degree | 13.3% | 31.9% | 38.5% |
| Completed bachelors | 8.3% | 24.5% | 30.3% |
| Completed masters | 3.4% | 8.1% | 11.5% |
| Completed professional degree | 0.0% | 2.3% | 3.3% |
| Completed doctorate | 0.0% | 1.0% | 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, OK schools is 22%. The average student to teacher ratio is n/a. In Marietta, OK, an average of 75.7% of students have completed 8th grade and an average of 68.3% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Thackerville, OK | 400 | 25% | 47.9% |
| Burneyville, OK | 743 | 25% | 48.4% |
| Marietta, OK | 2,746 | 22% | 53.4% |
| City | Population | Avg. Test Scores | National Avg. |
| Santa Rosa, TX | 2,745 | 42% | 13.5% |
| Thermopolis, WY | 2,747 | 60% | 24.3% |
| Meeker, CO | 2,745 | 52% | 8.7% |
| Greenwich, NJ | 2,747 | 60% | 25.0% |
| Tompkinsville, KY | 2,748 | 61% | 26.3% |
| Marietta, OK | 2,746 | 22% | 53.4% |
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