Oak Lake township
- County:
- Brookings County
- County Seat:
- No
- Area (mi²):
- 35.805
- State:
- South Dakota
Oak Lake township is located in Brookings County, South Dakota. Oak Lake township has a 2026 population of 98. Oak Lake township is currently growing at a rate of 1.03% annually and its population has increased by 5.38% since the most recent census, which recorded a population of 93 in 2020.
The median household income in Oak Lake township is $133,125 with a poverty rate of 0%. The median age in Oak Lake township is 60 years: 54.5 years for males, and 60.1 years for females. For every 100 females there are 142.2 males.