| Index | Duncombe | Iowa | National |
| Average Test Scores | n/a | 69% | 48% |
| Student/Teacher ratio | n/a | 13:1 | 16:1 |
| Total public schools | n/a | 1,101 | 79,221 |
| Total private schools | n/a | 208 | 24,874 |
| Total post-secondary schools | n/a | 96 | 7,963 |
| Index | Duncombe | Iowa | National |
| Completed 8th grade | 85.8% | 89.2% | 84.3% |
| Completed high school | 84.5% | 87.7% | 83.0% |
| Completed some college | 47.5% | 59.8% | 59.4% |
| Completed associate degree | 23.7% | 38.4% | 38.5% |
| Completed bachelors | 7.3% | 27.2% | 30.3% |
| Completed masters | 1.4% | 8.7% | 11.5% |
| Completed professional degree | 0.5% | 2.7% | 3.3% |
| Completed doctorate | 0.0% | 1.1% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Duncombe. Using the proficiency score averages, the average test scores for Duncombe, IA schools is n/a. The average student to teacher ratio is n/a. In Duncombe, IA, an average of 85.8% of students have completed 8th grade and an average of 84.5% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Dayton, IA | 839 | 82% | 70.8% |
| Gowrie, IA | 932 | 72% | 50.0% |
| Stratford, IA | 669 | 65% | 35.4% |
| Webster City, IA | 7,699 | 64% | 33.3% |
| Fort Dodge, IA | 24,168 | 55% | 14.8% |
| Duncombe, IA | 341 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Shirley, AR | 341 | 43% | 9.9% |
| Towanda, IL | 341 | 65% | 34.4% |
| Brockton, MT | 341 | 27% | 44.4% |
| Beaver Creek, MN | 341 | 80% | 65.6% |
| Canaan, VT | 341 | 40% | 16.7% |
| Duncombe, IA | 341 | n/a |
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