Alpena
- County:
- Jerauld County
- County Seat:
- No
- Area (mi²):
- 33.097
- State:
- South Dakota
Alpena is located in Jerauld County, South Dakota. Alpena has a 2025 population of 94 . Alpena is currently growing at a rate of 2.17% annually and its population has increased by 8.05% since the most recent census, which recorded a population of 87 in 2020.
The median age in Alpena is 11 years: 11.3 years for males, and 10.8 years for females. For every 100 females there are 161.5 males.