| 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 |
| 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 | 1,317 | 72% | 50.0% |
| Taylors, SC | 23,107 | 69% | 43.6% |
| Mauldin, SC | 25,829 | 69% | 42.7% |
| Greer, SC | 32,229 | 64% | 33.0% |
| Simpsonville, SC | 23,200 | 63% | 31.7% |
| Duncan, SC | 3,556 | 54% | 11.6% |
| City | Population | Avg. Test Scores | National Avg. |
| Loxahatchee Groves, FL | 3,557 | 69% | 43.8% |
| Gallipolis, OH | 3,557 | 64% | 32.7% |
| Knox, IN | 3,553 | 40% | 17.0% |
| St. Anthony, ID | 3,552 | 39% | 18.1% |
| Farmersville, TX | 3,560 | 54% | 12.5% |
| Duncan, SC | 3,556 | 54% | 11.6% |
Here are the best places to live in South Carolina
Most Dangerous States In The US
See the best places to live in Duncan
Check out the 10 most dangerous cities in South Carolina