| Place Name | Allen |
| Place Type | Census Designated Place |
| ZIP Code(s) | 57714 |
| County | Bennett County |
| Area Code(s) | 605 |
| Timezone | Mountain Standard Time (MST) |
| Population (2022) | 431 |
| Population Growth Rate (2010-19) | 9.52% |
| Majority Ethnicity | Native American 0% |
| US Congressional District(s) | South Dakota At-Large |
| State House Districts | 27 |
| State Senate Districts | 27 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 0% |
| African American | 0% |
| Hispanic | 91.16% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 8.84% |