Altamont
- County:
- Deuel County
- County Seat:
- No
- Area (mi²):
- 36.567
- State:
- South Dakota
Altamont is located in Deuel County, South Dakota. Altamont has a 2025 population of 112 . Altamont is currently growing at a rate of 0.9% annually and its population has increased by 3.7% since the most recent census, which recorded a population of 108 in 2020.
The median age in Altamont is 60.2 years: 60.3 years for males, and 60.1 years for females. For every 100 females there are 100.0 males.