Lake Sinai township
- County:
- Brookings County
- County Seat:
- No
- Area (mi²):
- 33.27
- State:
- South Dakota
Lake Sinai township is located in Brookings County, South Dakota. Lake Sinai township has a 2026 population of 177. Lake Sinai township is currently growing at a rate of 0.57% annually and its population has increased by 5.99% since the most recent census, which recorded a population of 167 in 2020.
The median household income in Lake Sinai township is $76,392 with a poverty rate of 0%. The median age in Lake Sinai township is 72.8 years: 72.4 years for males, and 74.5 years for females. For every 100 females there are 132.8 males.