Demographics & People — Castlewood, South Dakota
Population Overview
| Population (Census) | 756 |
|---|
| Estimated 2026 | ~900 |
|---|
| Median Age | 36.5 |
|---|
| Total Households | 277 |
|---|
| Family Households | 200 |
|---|
| Average Household Size | 2.73 |
|---|
| Diversity Index | N/A (N/A) |
|---|
Race & Ethnicity
| White | 670 |
|---|
| Black or African American | 5 |
|---|
| Asian | 0 |
|---|
| Hispanic or Latino | 5 |
|---|
Heritage & Ancestry
| Group | Count |
|---|
| German | 311 |
| Unclassified or not reported | 166 |
| Dutch | 94 |
| Norwegian | 87 |
| American | 48 |
| French (except Basque) | 44 |
| Irish | 43 |
| Other groups | 29 |
| English | 27 |
| Czech | 18 |
Language
| English Only | 687 |
|---|
| Spanish | 5 |
|---|
| Population 5+ | 692 |
|---|
Veterans
| Veterans | 42 |
|---|
| Population 18+ | 484 |
|---|
Source: Census ACS 5-Year 2023; Census ACS 5-Year 2023, Table B01003; Census ACS 5-Year 2023, B19013. Data for Castlewood, South Dakota.
