Demographics & People — Arlington, South Dakota
Population Overview
| Population (Census) | 833 |
| Estimated 2026 | ~1,200 |
| Median Age | 40.1 |
| Total Households | 356 |
| Family Households | 233 |
| Average Household Size | 2.21 |
| Diversity Index | N/A (N/A) |
Race & Ethnicity
| White | 824 |
| Black or African American | 0 |
| Asian | 0 |
| Hispanic or Latino | 10 |
Heritage & Ancestry
| Group | Count |
| German | 421 |
| Norwegian | 209 |
| Unclassified or not reported | 131 |
| Irish | 95 |
| Danish | 58 |
| Belgian | 58 |
| English | 47 |
| Other groups | 26 |
| Swedish | 24 |
| Polish | 23 |
Language
| English Only | 731 |
| Spanish | 0 |
| Population 5+ | 740 |
Veterans
| Veterans | 50 |
| Population 18+ | 629 |
Source: Census ACS 5-Year 2023; Census ACS 5-Year 2023, Table B01003; Census ACS 5-Year 2023, B19013. Data for Arlington, South Dakota.