Clear Lake
- County:
- Deuel County
- County Seat:
- Yes
- Area (mi²):
- 3.438
- State:
- South Dakota
Clear Lake is a city located in Deuel County, South Dakota. Clear Lake has a 2026 population of 1,201. It is also the county seat of Deuel County. Clear Lake is currently declining at a rate of -0.99% annually and its population has decreased by -1.48% since the most recent census, which recorded a population of 1,219 in 2020.
The median household income in Clear Lake is $84,792 with a poverty rate of 9.76%. The median age in Clear Lake is 43.1 years: 40.5 years for males, and 43.6 years for females. For every 100 females there are 103.8 males.