| Index | Onawa | Iowa | National |
| Average Test Scores | 66% | 69% | 48% |
| Student/Teacher ratio | 14:1 | 13:1 | 16:1 |
| Total public schools | 4 | 1,101 | 79,221 |
| Total private schools | n/a | 208 | 24,874 |
| Total post-secondary schools | n/a | 96 | 7,963 |
| Index | Onawa | Iowa | National |
| Completed 8th grade | 84.8% | 89.2% | 84.3% |
| Completed high school | 81.4% | 87.7% | 83.0% |
| Completed some college | 51.2% | 59.8% | 59.4% |
| Completed associate degree | 23.5% | 38.4% | 38.5% |
| Completed bachelors | 15.0% | 27.2% | 30.3% |
| Completed masters | 3.7% | 8.7% | 11.5% |
| Completed professional degree | 0.9% | 2.7% | 3.3% |
| Completed doctorate | 0.5% | 1.1% | 1.3% |
There are a total of 4 public schools, n/a private schools and n/a post-secondary schools in Onawa. Using the proficiency score averages, the average test scores for Onawa, IA schools is 66%. The average student to teacher ratio is 14:1. In Onawa, IA, an average of 84.8% of students have completed 8th grade and an average of 81.4% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Sloan, IA | 1,035 | 71% | 47.4% |
| Whiting, IA | 829 | 68% | 40.6% |
| Macy, NE | 927 | 11% | 78.1% |
| Onawa, IA | 2,788 | 66% | 36.5% |
| City | Population | Avg. Test Scores | National Avg. |
| Lake Helen, FL | 2,787 | 62% | 29.2% |
| Albion, IN | 2,789 | 39% | 19.3% |
| North Barrington, IL | 2,789 | 64% | 33.3% |
| Bushnell, IL | 2,789 | 14% | 70.8% |
| Sutter, CA | 2,789 | 38% | 20.5% |
| Onawa, IA | 2,788 | 66% | 36.5% |
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