| 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 | 627 | 75% | 55.2% |
| Mound Bayou, MS | 1,695 | 30% | 38.5% |
| Lyon, MS | 439 | 27% | 43.8% |
| Clarksdale, MS | 15,342 | 21% | 56.1% |
| Shelby, MS | 1,666 | 15% | 69.8% |
| Duncan, MS | 320 | 17% | 64.6% |
| City | Population | Avg. Test Scores | National Avg. |
| Ewing, IL | 320 | 47% | 2.1% |
| Fairmount, ND | 320 | 45% | 6.3% |
| Bynum, TX | 321 | 37% | 22.9% |
| Polk, NE | 319 | 50% | 4.2% |
| Taylorsville, GA | 319 | 54% | 11.5% |
| Duncan, MS | 320 | 17% | 64.6% |
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