| Index | Duncan | Mississippi | National |
| Average Test Scores | 17% | 40% | 48% |
| Student/Teacher ratio | n/a | 16:1 | 16:1 |
| Total public schools | n/a | 893 | 79,221 |
| Total private schools | n/a | 206 | 24,874 |
| Total post-secondary schools | n/a | 68 | 7,963 |
| Index | Duncan | Mississippi | National |
| Completed 8th grade | 54.0% | 78.6% | 84.3% |
| Completed high school | 48.2% | 76.7% | 83.0% |
| Completed some college | 36.0% | 52.5% | 59.4% |
| Completed associate degree | 12.1% | 29.8% | 38.5% |
| Completed bachelors | 9.6% | 21.0% | 30.3% |
| Completed masters | 4.8% | 7.9% | 11.5% |
| Completed professional degree | 2.6% | 2.2% | 3.3% |
| Completed doctorate | 0.4% | 0.9% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Duncan. Using the proficiency score averages, the average test scores for Duncan, MS schools is 17%. The average student to teacher ratio is n/a. In Duncan, MS, an average of 54.0% of students have completed 8th grade and an average of 48.2% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Merigold, MS | 650 | 75% | 55.2% |
| Mound Bayou, MS | 1,730 | 30% | 38.5% |
| Lyon, MS | 454 | 27% | 43.8% |
| Clarksdale, MS | 15,683 | 21% | 56.1% |
| Shelby, MS | 1,701 | 15% | 69.8% |
| Duncan, MS | 327 | 17% | 64.6% |
| City | Population | Avg. Test Scores | National Avg. |
| East Glacier Park Village, MT | 327 | 20% | 58.3% |
| Otis, KS | 327 | 42% | 12.5% |
| Polk, NE | 327 | 50% | 4.2% |
| Creighton, MO | 327 | 45% | 7.3% |
| Campton, KY | 326 | 38% | 20.1% |
| Duncan, MS | 327 | 17% | 64.6% |
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