
De Smet
- County:
- Kingsbury County
- County Seat:
- No
- Area (mi²):
- 1.158
- State:
- South Dakota
De Smet is a city located in Kingsbury County, South Dakota. De Smet has a 2025 population of 1,034. De Smet is currently declining at a rate of -0.58% annually and its population has decreased by -2.73% since the most recent census, which recorded a population of 1,063 in 2020.
The average household income in De Smet is $83,888 with a poverty rate of 5.42%. The median age in De Smet is 53.2 years: 55.3 years for males, and 52.4 years for females.