| Place Name | Watertown |
| Place Type | City |
| ZIP Code(s) | 57201 |
| County | Codington County |
| Area Code(s) | 605 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 21,524 |
| Population Growth Rate (2010-19) | 5.46% |
| Majority Ethnicity | White 92.04% |
| Metro/Micro Stats Area | Watertown, SD |
| US Congressional District(s) | South Dakota At-Large |
| State House Districts | 5 |
| State Senate Districts | 5 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 92.04% |
| African American | 1.16% |
| Hispanic | 2.46% |
| Asian | 0.71% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 3.63% |