| 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 | 

 
				
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				| 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. | 
| Hardin, TX | 712 | 42% | 11.8% | 
| Littlefork, MN | 712 | 61% | 26.6% | 
| Frankford, DE | 712 | 38% | 20.8% | 
| Driscoll, TX | 712 | 62% | 29.2% | 
| Stetsonville, WI | 711 | 55% | 13.5% | 
| Duncan, AZ | 712 | 42% | 13.5% |