| Place Name | Castlewood Township |
| Place Type | Township |
| ZIP Code(s) | 57201 57223 |
| County | Hamlin County |
| Area Code(s) | 605 |
| Timezone | Central Daylight Time (CDT) |
| Population (2021) | 150 |
| Majority Ethnicity | White 100% |
| Metro/Micro Stats Area | Watertown, SD |
| US Congressional District(s) | South Dakota At-Large |
| State House Districts | 2 |
| State Senate Districts | 2 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 100% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0% |