| Index | Defiance | Ohio | National |
| Average Test Scores | 70% | 61% | 48% |
| Student/Teacher ratio | 17:1 | 17:1 | 16:1 |
| Total public schools | 14 | 3,650 | 79,221 |
| Total private schools | 4 | 1,000 | 24,874 |
| Total post-secondary schools | 1 | 393 | 7,963 |
| Index | Defiance | Ohio | National |
| Completed 8th grade | 85.3% | 86.9% | 84.3% |
| Completed high school | 84.5% | 85.6% | 83.0% |
| Completed some college | 47.9% | 55.7% | 59.4% |
| Completed associate degree | 28.2% | 35.1% | 38.5% |
| Completed bachelors | 18.9% | 26.7% | 30.3% |
| Completed masters | 6.2% | 10.0% | 11.5% |
| Completed professional degree | 1.1% | 2.7% | 3.3% |
| Completed doctorate | 0.5% | 1.1% | 1.3% |
There are a total of 14 public schools, 4 private schools and 1 post-secondary schools in Defiance. Using the proficiency score averages, the average test scores for Defiance, OH schools is 70%. The average student to teacher ratio is 17:1. In Defiance, OH, an average of 85.3% of students have completed 8th grade and an average of 84.5% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Miller City, OH | 142 | 87% | 80.9% |
| Continental, OH | 1,408 | 81% | 68.2% |
| Holgate, OH | 1,149 | 77% | 60.4% |
| Napoleon, OH | 8,310 | 74% | 53.6% |
| Bryan, OH | 8,243 | 69% | 43.2% |
| Defiance, OH | 16,741 | 70% | 46.3% |
| City | Population | Avg. Test Scores | National Avg. |
| Seagoville, TX | 16,726 | 54% | 11.5% |
| Clayton, MO | 16,763 | 73% | 52.7% |
| Cohoes, NY | 16,708 | 52% | 8.5% |
| Farmingville, NY | 16,705 | 63% | 30.2% |
| Sunnyside, WA | 16,703 | 45% | 6.4% |
| Defiance, OH | 16,741 | 70% | 46.3% |
Here are the best places to live in Ohio
These are the largest cities in Ohio
Check out the 10 most dangerous cities in Ohio
Check out the 10 safest cities in Ohio