
Willow Lake
- County:
- Clark County
- County Seat:
- No
- Area (mi²):
- 0.372
- State:
- South Dakota
Willow Lake is a city located in Clark County, South Dakota. Willow Lake has a 2025 population of 261. Willow Lake is currently declining at a rate of 0% annually and its population has increased by 0.38% since the most recent census, which recorded a population of 260 in 2020.
The average household income in Willow Lake is $71,299 with a poverty rate of 1.1%. The median age in Willow Lake is 16.2 years: 15 years for males, and 17.4 years for females.