| Name | Sioux County |
| State | North Dakota |
| FIPS Code | 38085 |
| County Seat | Fort Yates |
| Timezone | Central Daylight Time (CDT) |
| Population (2024) | 3,659 |
| Population Growth Rate(2020-2024) | -6.5% |
| Majority Ethnicity | Native American 86.16% |
| Public School Majority Ethnicity | Native American 99% |
| Partisan Voting Index | Democratic:+19 |
| Unemployment Rate (May 2026) | 2.8% |
| Sales Tax Rate (2025) | 5% |
| Area Code(s) | 701 |
| Race/Ethnicity | Percentage of Population (2023) |
|---|---|
| White | 12.62% |
| African American | 0.19% |
| Hispanic | 1.03% |
| Asian | 0% |
| Native American | 86.16% |
| Hawaiin/Pacific Islander | 0% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 0.77% |
| African American | 0% |
| Hispanic | 0.22% |
| Asian | 0% |
| Native American | 98.8% |
| Hawaiin/Pacific Islander | 0.11% |