Sioux County's estimated 2026 population is 36,864 with a growth rate of 0.42% in the past year according to the most recent United States census data. Sioux County is the 19th largest county in Iowa. The 2010 population was 33,755 and has seen a growth of 9.21% since that time.
Data after 2023 is projected based on recent change
The racial composition of Sioux County includes 87.8% White, 4.99% other race, and smaller percentages for Asian, Black or African American, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
White (87.8%)
Two or more races (5.72%)
Other race (4.99%)
Asian (0.6%)
Black or African American (0.59%)
Native American (0.3%)
Native Hawaiian or Pacific Islander (0.01%)
Race | Population | Percentage (of total) |
|---|---|---|
| White | 31,594 | 87.8% |
| Two or more races | 2,060 | 5.72% |
| Other race | 1,794 | 4.99% |
| Asian | 215 | 0.6% |
| Black or African American | 212 | 0.59% |
| Native American | 107 | 0.3% |
| Native Hawaiian or Pacific Islander | 2 | 0.01% |
Married
Widowed
Divorced
Separated
Never Married
Sioux County's average per capita income is $48,518. Household income levels show a median of $84,736. The poverty rate stands at 6.43%.
Name | Median | Mean |
|---|---|---|
| Married Families | $106,941 | - |
| Families | $101,452 | $121,125 |
| Households | $84,736 | $104,234 |
| Non Families | $36,688 | $49,271 |
Average Income
Median Household Income
Poverty Rate