| Index | Duncan | Arizona | National |
| Average Test Scores | 42% | 43% | 48% |
| Student/Teacher ratio | n/a | 18:1 | 16:1 |
| Total public schools | n/a | 1,863 | 79,221 |
| Total private schools | n/a | 316 | 24,874 |
| Total post-secondary schools | n/a | 148 | 7,963 |
| Index | Duncan | Arizona | National |
| Completed 8th grade | 72.5% | 83.7% | 84.3% |
| Completed high school | 71.1% | 82.2% | 83.0% |
| Completed some college | 40.4% | 62.0% | 59.4% |
| Completed associate degree | 15.3% | 36.5% | 38.5% |
| Completed bachelors | 6.2% | 28.0% | 30.3% |
| Completed masters | 3.2% | 10.4% | 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, AZ schools is 42%. The average student to teacher ratio is n/a. In Duncan, AZ, an average of 72.5% of students have completed 8th grade and an average of 71.1% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Duncan, AZ | 712 | 42% | 13.5% |
| City | Population | Avg. Test Scores | National Avg. |
| Littlefork, MN | 712 | 61% | 26.6% |
| Frankford, DE | 712 | 38% | 20.8% |
| Driscoll, TX | 712 | 62% | 29.2% |
| Hardin, TX | 712 | 42% | 11.8% |
| Mesa, WA | 713 | 38% | 21.4% |
| Duncan, AZ | 712 | 42% | 13.5% |
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