| Place Name | Harbor Island |
| Place Type | Census Designated Place |
| ZIP Code(s) | 29920 |
| County | Beaufort County |
| Area Code(s) | 843,854 |
| Timezone | Eastern Daylight Time (EDT) |
| Population (2022) | 316 |
| Majority Ethnicity | White 100% |
| Metro/Micro Stats Area | Hilton Head Island-Bluffton, SC |
| US Congressional District(s) | South Carolina 1st |
| State House Districts | 121 |
| State Senate Districts | 43 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 100% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0% |