| Index | Denison | Iowa | National |
| Average Test Scores | 63% | 69% | 48% |
| Student/Teacher ratio | 14:1 | 13:1 | 16:1 |
| Total public schools | 3 | 1,101 | 79,221 |
| Total private schools | 2 | 208 | 24,874 |
| Total post-secondary schools | 1 | 96 | 7,963 |
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| Index | Denison | Iowa | National |
| Completed 8th grade | 65.1% | 89.2% | 84.3% |
| Completed high school | 62.1% | 87.7% | 83.0% |
| Completed some college | 35.4% | 59.8% | 59.4% |
| Completed associate degree | 18.2% | 38.4% | 38.5% |
| Completed bachelors | 10.7% | 27.2% | 30.3% |
| Completed masters | 2.4% | 8.7% | 11.5% |
| Completed professional degree | 0.9% | 2.7% | 3.3% |
| Completed doctorate | 0.0% | 1.1% | 1.3% |
There are a total of 3 public schools, 2 private schools and 1 post-secondary schools in Denison. Using the proficiency score averages, the average test scores for Denison, IA schools is 63%. The average student to teacher ratio is 14:1. In Denison, IA, an average of 65.1% of students have completed 8th grade and an average of 62.1% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Manning, IA | 1,550 | 76% | 57.8% |
| Dow City, IA | 440 | 75% | 55.2% |
| Schleswig, IA | 979 | 74% | 53.1% |
| Dunlap, IA | 1,214 | 70% | 44.8% |
| Westside, IA | 248 | 69% | 42.7% |
| Denison, IA | 8,319 | 63% | 31.3% |
| City | Population | Avg. Test Scores | National Avg. |
| Athol, MA | 8,323 | 37% | 22.2% |
| Roxboro, NC | 8,323 | 42% | 12.3% |
| Hawthorn Woods, IL | 8,313 | 51% | 6.6% |
| Baxter, MN | 8,326 | 72% | 49.5% |
| Toccoa, GA | 8,328 | 39% | 19.0% |
| Denison, IA | 8,319 | 63% | 31.3% |
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