Castlewood city, South Dakota
Official LSAD Designation: Castlewood city • Census GEOID: 4610500
• Hamlin County
Castlewood city is an incorporated city in Hamlin County, South Dakota. According to official records from the Census (2025), Castlewood city had an estimated population of 739 residents. Official Census Bureau geographic records classify this community under LSAD designation Castlewood city (GEOID 4610500).
Local Government Administration U.S. Census Bureau GMAF
City Of Castlewood
Municipal
Official Title:
Finance Officer
Address:
PO BOX 17, CASTLEWOOD SD 57223-0017
County Of Hamlin
County
Official Title:
Hamlin Co Auditor
Address:
PO BOX 237, HAYTI SD 57241-0237
Civic & Statistical Snapshot
| Category | Estimate | Survey Period / Source |
|---|---|---|
| Total Population | 739 | 2025 |
| Median Household Income | $87,045 | 2020-2024 |
| Median Home Value | $198,200 | 2020-2024 |
| Land Area | 1.15 sq mi | Gazetteer (2026) |
| Civic & Public Services | Hospitals, Libraries, Colleges | CMS / IMLS / IPEDS |
| Schools & Districts | NCES Directory Listings | Provided by k12guides.com |
| Nearby Airports | Landing Facilities | Provided by airport-data.com |
| Climate & Weather | NOAA 30-Year Normals | 1991–2020 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).