| Index | Duncan | South Carolina | National |
| Average Test Scores | 54% | 47% | 48% |
| Student/Teacher ratio | 14:1 | 16:1 | 16:1 |
| Total public schools | 5 | 932 | 79,221 |
| Total private schools | 1 | 369 | 24,874 |
| Total post-secondary schools | n/a | 96 | 7,963 |


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| Index | Duncan | South Carolina | National |
| Completed 8th grade | 81.6% | 83.0% | 84.3% |
| Completed high school | 80.3% | 81.6% | 83.0% |
| Completed some college | 46.8% | 56.6% | 59.4% |
| Completed associate degree | 21.5% | 35.6% | 38.5% |
| Completed bachelors | 18.6% | 26.5% | 30.3% |
| Completed masters | 3.7% | 9.6% | 11.5% |
| Completed professional degree | 1.8% | 2.5% | 3.3% |
| Completed doctorate | 0.2% | 1.1% | 1.3% |
There are a total of 5 public schools, 1 private schools and n/a post-secondary schools in Duncan. Using the proficiency score averages, the average test scores for Duncan, SC schools is 54%. The average student to teacher ratio is 14:1. In Duncan, SC, an average of 81.6% of students have completed 8th grade and an average of 80.3% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Reidville, SC | 1,358 | 72% | 50.0% |
| Taylors, SC | 23,727 | 69% | 43.6% |
| Mauldin, SC | 26,699 | 69% | 42.7% |
| Greer, SC | 33,190 | 64% | 33.0% |
| Simpsonville, SC | 23,729 | 63% | 31.7% |
| Duncan, SC | 3,627 | 54% | 11.6% |
| City | Population | Avg. Test Scores | National Avg. |
| Mission Hills, CA | 3,627 | 50% | 3.1% |
| Princess Anne, MD | 3,628 | 27% | 44.3% |
| Bridgeville, DE | 3,626 | 37% | 22.4% |
| Campo, CA | 3,625 | 26% | 46.4% |
| Port St. Joe, FL | 3,629 | 53% | 9.9% |
| Duncan, SC | 3,627 | 54% | 11.6% |