| Index | Union City | California | National |
| Average Test Scores | 48% | 43% | 48% |
| Student/Teacher ratio | 20:1 | 20:1 | 16:1 |
| Total public schools | 11 | 8,308 | 79,221 |
| Total private schools | 3 | 3,438 | 24,874 |
| Total post-secondary schools | n/a | 1,085 | 7,963 |
| Index | Union City | California | National |
| Completed 8th grade | 88.2% | 81.1% | 84.3% |
| Completed high school | 87.5% | 79.8% | 83.0% |
| Completed some college | 63.2% | 61.5% | 59.4% |
| Completed associate degree | 42.8% | 39.8% | 38.5% |
| Completed bachelors | 36.2% | 32.0% | 30.3% |
| Completed masters | 11.7% | 11.9% | 11.5% |
| Completed professional degree | 3.1% | 3.9% | 3.3% |
| Completed doctorate | 1.3% | 1.6% | 1.3% |
There are a total of 11 public schools, 3 private schools and n/a post-secondary schools in Union City. Using the proficiency score averages, the average test scores for Union City, CA schools is 48%. The average student to teacher ratio is 20:1. In Union City, CA, an average of 88.2% of students have completed 8th grade and an average of 87.5% have completed high school.
| City | Population | Avg. Test Scores | National Avg. |
| Sunol, CA | 835 | 85% | 76.0% |
| Palo Alto, CA | 67,973 | 81% | 68.5% |
| Foster City, CA | 33,056 | 78% | 63.3% |
| San Ramon, CA | 81,344 | 78% | 62.9% |
| San Carlos, CA | 29,647 | 78% | 62.4% |
| Union City, CA | 75,067 | 48% | 0.6% |
| City | Population | Avg. Test Scores | National Avg. |
| Arlington Heights, IL | 75,071 | 48% | 0.1% |
| Missoula, MT | 74,994 | 53% | 11.1% |
| Milpitas, CA | 75,182 | 61% | 26.9% |
| Missouri City, TX | 75,348 | 51% | 5.2% |
| St. Joseph, MO | 75,369 | 36% | 24.6% |
| Union City, CA | 75,067 | 48% | 0.6% |
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