| Place Name | Castro Valley |
| Place Type | Census Designated Place |
| ZIP Code(s) | 94546 94552 |
| GEOID | 0611964 |
| County | Alameda County |
| Area Code(s) | 341,510 |
| Timezone | Pacific Standard Time (PST) |
| Population (2021) | 66,324 |
| Population Growth Rate (2010-19) | 8.23% |
| Majority Ethnicity | White 42.75% |
| 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 | 42.75% |
| African American | 9.17% |
| Hispanic | 0.93% |
| Asian | 30.52% |
| Native American | 0.23% |
| Hawaiin/Pacific Islander | 16.4% |