| Place Name | Castle Hill |
| Place Type | Census Designated Place |
| ZIP Code(s) | 94507 94595 |
| County | Contra Costa County |
| Area Code(s) | 925 |
| Timezone | Pacific Standard Time (PST) |
| Population (2022) | 1,218 |
| Population Growth Rate (2010-19) | -2.16% |
| Majority Ethnicity | White 77.15% |
| Metro/Micro Stats Area | San Francisco-Oakland-Berkeley, CA |
| US Congressional District(s) | California 11th |
| State Assembly Districts | 16 |
| State Senate Districts | 7 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 77.15% |
| African American | 7.07% |
| Hispanic | 0% |
| Asian | 8.6% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 7.18% |