| Place Name | Alpena |
| Place Type | Town |
| ZIP Code(s) | 57312 |
| County | Jerauld County |
| Area Code(s) | 605 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 302 |
| Population Growth Rate (2010-19) | -25.87% |
| Majority Ethnicity | White 67.73% |
| Metro/Micro Stats Area | Huron, SD |
| US Congressional District(s) | South Dakota At-Large |
| State House Districts | 20 |
| State Senate Districts | 20 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 67.73% |
| African American | 0% |
| Hispanic | 4.43% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 27.83% |