| Name | Marshall County |
| State | South Dakota |
| FIPS Code | 46091 |
| County Seat | Britton |
| Timezone | Central Daylight Time (CDT) |
| Population (2024) | 4,358 |
| Population Growth Rate(2020-2024) | 1.33% |
| Majority Ethnicity | White 87.01% |
| Public School Majority Ethnicity | White 91% |
| Partisan Voting Index | Republican:+12 |
| Unemployment Rate (May 2026) | 3.2% |
| Sales Tax Rate (2025) | 4.2% |
| Area Code(s) | 605 |
| Race/Ethnicity | Percentage of Population (2023) |
|---|---|
| White | 87.01% |
| African American | 0.26% |
| Hispanic | 6.17% |
| Asian | 0% |
| Native American | 6.57% |
| Hawaiin/Pacific Islander | 0% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 91.14% |
| African American | 0.59% |
| Hispanic | 4.43% |
| Asian | 0.3% |
| Native American | 0.74% |
| Hawaiin/Pacific Islander | 0.15% |