Castlewood city, South Dakota
Official LSAD Designation: Castlewood city • Census GEOID: 4610500
• Hamlin County
Demographics & Population Profile
Population and demographics for Castlewood city.
| Demographic Variable | Estimate / Count | Margin of Error | Period | Source |
|---|---|---|---|---|
| Total Population (2025 PEP Estimate) | 739 | — | 2025 | Census |
| Median Age | 36.5 yrs | ±3.6 | 2020-2024 | Census ACS 5-Year 2024 |
| Total Households | 292 | ±54 | 2020-2024 | Census ACS 5-Year 2024 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).