| District Name | Shelter Island Union Free School District |
| State | New York |
| County | Suffolk County |
| Statistical Area | New York-Newark-Jersey City, NY-NJ-PA |
| Total Students (2021) | 215 |
| District Growth Rate (2017-21) | -4.4% |
| Majority Race/Ethnicty | White (67.4%) |
| Free/Reduced Lunch Program | 35.35% |