| Place Name | Union City |
| Place Type | City |
| ZIP Code(s) | 94587 |
| County | Alameda County |
| Area Code(s) | 341,510 |
| Timezone | Pacific Daylight Time (PDT) |
| Population (2022) | 69,820 |
| Population Growth Rate (2010-19) | 0.90% |
| Majority Ethnicity | Asian 54.96% |
| Metro/Micro Stats Area | San Francisco-Oakland-Berkeley, CA |
| US Congressional District(s) | California 15th |
| State Assembly Districts | 20 |
| State Senate Districts | 10 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 18.54% |
| African American | 4.74% |
| Hispanic | 0.67% |
| Asian | 54.96% |
| Native American | 0.96% |
| Hawaiin/Pacific Islander | 20.13% |