| Place Name | Barnum Island |
| Place Type | Census Designated Place |
| ZIP Code(s) | 11558 |
| County | Nassau County |
| Area Code(s) | 516 |
| Timezone | Eastern Daylight Time (EDT) |
| Population (2022) | 2,579 |
| Population Growth Rate (2010-19) | 7.29% |
| Majority Ethnicity | White 81.65% |
| Metro/Micro Stats Area | New York-Newark-Jersey City, NY-NJ-PA |
| US Congressional District(s) | New York 4th |
| State Assembly Districts | 20 |
| State Senate Districts | 9 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 81.65% |
| African American | 3.69% |
| Hispanic | 0% |
| Asian | 2.92% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 11.75% |