| Place Name | Jefferson |
| Place Type | City |
| ZIP Code(s) | 57038 |
| County | Union County |
| Area Code(s) | 605 |
| Timezone | Central Standard Time (CST) |
| Population (2022) | 624 |
| Population Growth Rate (2010-19) | -13.16% |
| Majority Ethnicity | White 92.97% |
| Metro/Micro Stats Area | Sioux City, IA-NE-SD |
| US Congressional District(s) | South Dakota At-Large |
| State House Districts | 16 |
| State Senate Districts | 16 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 92.97% |
| African American | 0% |
| Hispanic | 3.29% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 3.74% |