| Index | Marietta | North Carolina | National |
| Average Test Scores | n/a | 43% | 48% |
| Student/Teacher ratio | n/a | 15:1 | 16:1 |
| Total public schools | n/a | 1,895 | 79,221 |
| Total private schools | n/a | 510 | 24,874 |
| Total post-secondary schools | n/a | 183 | 7,963 |
| Index | Marietta | North Carolina | National |
| Completed 8th grade | 83.9% | 83.4% | 84.3% |
| Completed high school | 83.9% | 81.9% | 83.0% |
| Completed some college | 42.9% | 59.9% | 59.4% |
| Completed associate degree | 18.8% | 38.1% | 38.5% |
| Completed bachelors | 8.9% | 29.0% | 30.3% |
| Completed masters | 5.4% | 10.2% | 11.5% |
| Completed professional degree | 0.0% | 2.9% | 3.3% |
| Completed doctorate | 0.0% | 1.3% | 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, NC schools is n/a. The average student to teacher ratio is n/a. In Marietta, NC, an average of 83.9% of students have completed 8th grade and an average of 83.9% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Cerro Gordo, NC | 322 | 39% | 18.2% |
| Dillon, SC | 6,358 | 36% | 24.8% |
| Lake View, SC | 714 | 35% | 26.6% |
| Tabor City, NC | 4,038 | 33% | 30.5% |
| Mullins, SC | 4,276 | 30% | 38.5% |
| Marietta, NC | 146 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Downsville, LA | 146 | 69% | 43.8% |
| Crossnore, NC | 146 | 33% | 30.7% |
| Chinese Camp, CA | 146 | 60% | 25.0% |
| Cloverdale, OR | 146 | 42% | 12.5% |
| Port Lions, AK | 145 | 50% | 4.2% |
| Marietta, NC | 146 | n/a |
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