| Index | Union | Illinois | National |
| Average Test Scores | n/a | 33% | 48% |
| Student/Teacher ratio | n/a | 18:1 | 16:1 |
| Total public schools | n/a | 3,938 | 79,221 |
| Total private schools | n/a | 1,438 | 24,874 |
| Total post-secondary schools | n/a | 306 | 7,963 |
| Index | Union | Illinois | National |
| Completed 8th grade | 90.7% | 86.2% | 84.3% |
| Completed high school | 89.7% | 84.7% | 83.0% |
| Completed some college | 55.0% | 61.8% | 59.4% |
| Completed associate degree | 30.7% | 40.7% | 38.5% |
| Completed bachelors | 20.0% | 32.9% | 30.3% |
| Completed masters | 6.7% | 12.7% | 11.5% |
| Completed professional degree | 0.3% | 3.4% | 3.3% |
| Completed doctorate | 0.0% | 1.2% | 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, IL schools is n/a. The average student to teacher ratio is n/a. In Union, IL, an average of 90.7% of students have completed 8th grade and an average of 89.7% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Burlington, IL | 514 | 54% | 12.5% |
| Huntley, IL | 27,413 | 50% | 3.6% |
| Sleepy Hollow, IL | 3,276 | 50% | 3.1% |
| Algonquin, IL | 30,848 | 48% | 0.9% |
| Crystal Lake, IL | 39,685 | 46% | 3.9% |
| Union, IL | 680 | n/a |
| City | Population | Avg. Test Scores | National Avg. |
| Sterling, OK | 680 | 32% | 32.8% |
| Norwood, MO | 680 | 44% | 8.7% |
| Cherokee, KS | 679 | 25% | 48.4% |
| Lovelady, TX | 679 | 57% | 18.8% |
| Milnor, ND | 681 | 49% | 1.6% |
| Union, IL | 680 | n/a |
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