| Index | Union | Iowa | National |
| Average Test Scores | 72% | 69% | 48% |
| Student/Teacher ratio | n/a | 13:1 | 16:1 |
| Total public schools | n/a | 1,101 | 79,221 |
| Total private schools | n/a | 208 | 24,874 |
| Total post-secondary schools | n/a | 96 | 7,963 |
| Index | Union | Iowa | National |
| Completed 8th grade | 88.8% | 89.2% | 84.3% |
| Completed high school | 88.5% | 87.7% | 83.0% |
| Completed some college | 49.7% | 59.8% | 59.4% |
| Completed associate degree | 26.0% | 38.4% | 38.5% |
| Completed bachelors | 15.7% | 27.2% | 30.3% |
| Completed masters | 3.8% | 8.7% | 11.5% |
| Completed professional degree | 1.8% | 2.7% | 3.3% |
| Completed doctorate | 0.0% | 1.1% | 1.3% |
There are a total of n/a public schools, n/a private schools and n/a post-secondary schools in Union. Using the proficiency score averages, the average test scores for Union, IA schools is 72%. The average student to teacher ratio is n/a. In Union, IA, an average of 88.8% of students have completed 8th grade and an average of 88.5% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Grundy Center, IA | 2,671 | 85% | 77.8% |
| Green Mountain, IA | 182 | 75% | 55.2% |
| Zearing, IA | 547 | 70% | 45.8% |
| Wellsburg, IA | 725 | 70% | 44.8% |
| Conrad, IA | 1,224 | 69% | 42.7% |
| Union, IA | 412 | 72% | 50.0% |
| City | Population | Avg. Test Scores | National Avg. |
| Oakesdale, WA | 412 | 75% | 56.3% |
| Freeport, OH | 412 | 50% | 4.2% |
| Jordan, MT | 412 | 48% | 0.7% |
| Follett, TX | 412 | 47% | 2.1% |
| Bigelow, AR | 411 | 47% | 2.1% |
| Union, IA | 412 | 72% | 50.0% |
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