| Place Name | Sinai |
| Place Type | Town |
| ZIP Code(s) | 57061 |
| County | Brookings County |
| Area Code(s) | 605 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 125 |
| Population Growth Rate (2010-19) | -17.50% |
| Majority Ethnicity | White 96.97% |
| Metro/Micro Stats Area | Brookings, SD |
| US Congressional District(s) | South Dakota At-Large |
| State House Districts | 4 |
| State Senate Districts | 4 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 96.97% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 3.03% |