Valley
- County:
- Douglas County
- County Seat:
- No
- Area (mi²):
- 36.047
- State:
- South Dakota
Valley is located in Douglas County, South Dakota. Valley has a 2025 population of 134 . Valley is currently declining at a rate of 0% annually and its population has increased by 1.52% since the most recent census, which recorded a population of 132 in 2020.
The median age in Valley is 12.2 years: 12.1 years for males, and 16.2 years for females. For every 100 females there are 121.8 males.