| Index | Mellette | South Dakota | National |
| Average Test Scores | 50% | 48% | 48% |
| Student/Teacher ratio | n/a | 14:1 | 16:1 |
| Total public schools | n/a | 340 | 79,221 |
| Total private schools | n/a | 76 | 24,874 |
| Total post-secondary schools | n/a | 25 | 7,963 |
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| Index | Mellette | South Dakota | National |
| Completed 8th grade | 93.6% | 89.1% | 84.3% |
| Completed high school | 93.6% | 86.8% | 83.0% |
| Completed some college | 60.6% | 60.4% | 59.4% |
| Completed associate degree | 25.7% | 38.5% | 38.5% |
| Completed bachelors | 14.7% | 27.5% | 30.3% |
| Completed masters | 2.8% | 8.1% | 11.5% |
| Completed professional degree | 0.0% | 2.5% | 3.3% |
| Completed doctorate | 0.0% | 1.2% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Mellette. Using the proficiency score averages, the average test scores for Mellette, SD schools is 50%. The average student to teacher ratio is n/a. In Mellette, SD, an average of 93.6% of students have completed 8th grade and an average of 93.6% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Warner, SD | 500 | 72% | 50.3% |
| Mellette, SD | 191 | 50% | 4.2% |
| City | Population | Avg. Test Scores | National Avg. |
| Chugwater, WY | 191 | 50% | 4.2% |
| Ruby, AK | 190 | 25% | 47.9% |
| Blackwell, TX | 192 | 55% | 13.5% |
| Stony Creek, VA | 190 | 83% | 72.9% |
| Caledonia, MO | 190 | 40% | 17.7% |
| Mellette, SD | 191 | 50% | 4.2% |
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