| Index | Duncan | Nebraska | National |
| Average Test Scores | n/a | 53% | 48% |
| Student/Teacher ratio | n/a | 13:1 | 16:1 |
| Total public schools | n/a | 780 | 79,221 |
| Total private schools | n/a | 182 | 24,874 |
| Total post-secondary schools | n/a | 56 | 7,963 |
| Index | Duncan | Nebraska | National |
| Completed 8th grade | 89.0% | 88.4% | 84.3% |
| Completed high school | 86.9% | 87.2% | 83.0% |
| Completed some college | 38.0% | 63.7% | 59.4% |
| Completed associate degree | 19.6% | 40.1% | 38.5% |
| Completed bachelors | 6.5% | 30.0% | 30.3% |
| Completed masters | 1.8% | 9.9% | 11.5% |
| Completed professional degree | 0.0% | 2.9% | 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 Duncan. Using the proficiency score averages, the average test scores for Duncan, NE schools is n/a. The average student to teacher ratio is n/a. In Duncan, NE, an average of 89.0% of students have completed 8th grade and an average of 86.9% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Richland, NE | 95 | 70% | 45.8% |
| Genoa, NE | 905 | 58% | 21.4% |
| Osceola, NE | 826 | 57% | 18.1% |
| Bellwood, NE | 415 | 55% | 14.6% |
| Silver Creek, NE | 490 | 55% | 14.6% |
| Duncan, NE | 487 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Mardela Springs, MD | 487 | 55% | 15.1% |
| Paauilo, HI | 487 | 30% | 38.5% |
| Polo, MO | 487 | 45% | 6.5% |
| Canaseraga, NY | 487 | 57% | 18.8% |
| Lyerly, GA | 487 | 45% | 6.3% |
| Duncan, NE | 487 | n/a |
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