| Index | Union | Missouri | National |
| Average Test Scores | 49% | 44% | 48% |
| Student/Teacher ratio | 13:1 | 14:1 | 16:1 |
| Total public schools | 8 | 1,899 | 79,221 |
| Total private schools | 1 | 531 | 24,874 |
| Total post-secondary schools | 1 | 213 | 7,963 |
| Index | Union | Missouri | National |
| Completed 8th grade | 85.1% | 86.0% | 84.3% |
| Completed high school | 81.5% | 84.2% | 83.0% |
| Completed some college | 56.9% | 57.7% | 59.4% |
| Completed associate degree | 30.7% | 35.2% | 38.5% |
| Completed bachelors | 20.0% | 27.6% | 30.3% |
| Completed masters | 6.6% | 10.4% | 11.5% |
| Completed professional degree | 0.8% | 2.8% | 3.3% |
| Completed doctorate | 0.3% | 1.2% | 1.3% |
There are a total of 8 public schools, 1 private schools and 1 post-secondary schools in Union. Using the proficiency score averages, the average test scores for Union, MO schools is 49%. The average student to teacher ratio is 13:1. In Union, MO, an average of 85.1% of students have completed 8th grade and an average of 81.5% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Augusta, MO | 284 | 57% | 18.8% |
| New Haven, MO | 2,819 | 56% | 16.9% |
| Washington, MO | 14,052 | 49% | 1.0% |
| Villa Ridge, MO | 3,179 | 48% | = 100 |
| Marthasville, MO | 2,410 | 47% | 2.1% |
| Union, MO | 11,931 | 49% | 3.0% |
| City | Population | Avg. Test Scores | National Avg. |
| St. Peter, MN | 11,934 | 46% | 4.7% |
| Blackfoot, ID | 11,936 | 42% | 12.5% |
| Healdsburg, CA | 11,924 | 50% | 4.8% |
| Elon, NC | 11,941 | 46% | 4.9% |
| Macedonia, OH | 11,942 | 81% | 69.3% |
| Union, MO | 11,931 | 49% | 3.0% |
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