| Index | Marietta | Minnesota | National |
| Average Test Scores | n/a | 52% | 48% |
| Student/Teacher ratio | n/a | 16:1 | 16:1 |
| Total public schools | n/a | 2,224 | 79,221 |
| Total private schools | n/a | 477 | 24,874 |
| Total post-secondary schools | n/a | 140 | 7,963 |
| Index | Marietta | Minnesota | National |
| Completed 8th grade | 82.6% | 90.5% | 84.3% |
| Completed high school | 79.3% | 89.5% | 83.0% |
| Completed some college | 43.8% | 66.9% | 59.4% |
| Completed associate degree | 18.2% | 45.2% | 38.5% |
| Completed bachelors | 9.9% | 34.2% | 30.3% |
| Completed masters | 0.0% | 11.5% | 11.5% |
| Completed professional degree | 0.0% | 3.5% | 3.3% |
| Completed doctorate | 0.0% | 1.4% | 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, MN schools is n/a. The average student to teacher ratio is n/a. In Marietta, MN, an average of 82.6% of students have completed 8th grade and an average of 79.3% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Madison, MN | 1,647 | 59% | 22.6% |
| Milbank, SD | 3,137 | 51% | 6.3% |
| Marietta, MN | 167 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Richey, MT | 167 | 50% | 4.2% |
| Hartly, DE | 167 | 62% | 29.2% |
| Port Wing, WI | 167 | 48% | 1.0% |
| Yoder, WY | 166 | 72% | 49.0% |
| Campbell, MN | 166 | 43% | 11.5% |
| Marietta, MN | 167 | n/a |
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