| Place Name | St. Helena |
| Place Type | City |
| ZIP Code(s) | 94508 94574 94576 |
| County | Napa County |
| Area Code(s) | 707 |
| Timezone | Pacific Daylight Time (PDT) |
| Population (2022) | 5,846 |
| Population Growth Rate (2010-19) | -6.60% |
| Majority Ethnicity | White 75.38% |
| Metro/Micro Stats Area | Napa, CA |
| US Congressional District(s) | California 5th |
| State Assembly Districts | 4 |
| State Senate Districts | 3 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 75.38% |
| African American | 0.64% |
| Hispanic | 0.17% |
| Asian | 1.85% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 21.96% |