| Place Name | Oacoma |
| Place Type | Town |
| ZIP Code(s) | 57365 |
| County | Lyman County |
| Area Code(s) | 605 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 521 |
| Population Growth Rate (2010-19) | -14.41% |
| Majority Ethnicity | White 96.54% |
| US Congressional District(s) | South Dakota At-Large |
| State House Districts | 26B |
| State Senate Districts | 26 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 96.54% |
| African American | 0% |
| Hispanic | 3.46% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0% |