| Place Name | Riverhead (town) |
| Place Type | Town |
| County | Suffolk County |
| Area Code(s) | 631,934 |
| Timezone | Eastern Daylight Time (EDT) |
| Population (2021) | 35,630 |
| Majority Ethnicity | White 76.26% |
| Metro/Micro Stats Area | New York-Newark-Jersey City, NY-NJ-PA |
| US Congressional District(s) | New York 1st |
| State Assembly Districts | 2 |
| State Senate Districts | 1 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 76.26% |
| African American | 8.07% |
| Hispanic | 0.06% |
| Asian | 1.82% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 13.8% |