Sioux County's 2026 population is estimated at 3,821, reflecting a 1.43% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Sioux County is the 27th largest county in North Dakota. The 2010 population was 4,148 and has grown -7.88% since 2010.
Data after 2023 is projected based on recent change
Overall: 28.2 years
Female: 28.8 years
Male: 26.3 years
There are 2,467 adults, (360 of whom are seniors) in Sioux County.
Female: 1,878 (50.2%)
Male: 1,862 (49.8%)
The racial composition of Sioux County includes 82.83% Native American, 12.43% White, and smaller percentages for Two or more races, other race, Asian, Black or African American and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| Native American | 3,098 | 82.83% |
| White | 465 | 12.43% |
| Two or more races | 95 | 2.54% |
| Other race | 43 | 1.15% |
| Asian | 25 | 0.67% |
| Black or African American | 14 | 0.37% |
Sioux County 's average per capita income is $43,205. Household income levels show a median of $42,083. The poverty rate stands at 43.29%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $80,000 | - |
| Families | $45,568 | $70,096 |
| Households | $42,083 | $65,479 |
| Non Families | $34,129 | $47,957 |
Average Income
Median Household Income
Poverty Rate