Sioux County's estimated 2026 population is 36,771 with a growth rate of -0.01% 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 8.93% since that time.
Data after 2023 is projected based on recent change
Overall: 33.8 years
Female: 34.5 years
Male: 33.5 years
There are 26,375 adults, (5,866 of whom are seniors) in Sioux County.
Female: 17,892 (49.4%)
Male: 18,320 (50.6%)
The racial composition of Sioux County includes 85.03% White, 6.86% other race, and smaller percentages for Black or African American, Asian, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 30,791 | 85.03% |
| Other race | 2,483 | 6.86% |
| Two or more races | 2,391 | 6.6% |
| Black or African American | 214 | 0.59% |
| Asian | 197 | 0.54% |
| Native American | 130 | 0.36% |
| Native Hawaiian or Pacific Islander | 6 | 0.02% |
Sioux County's average per capita income is $50,919. Household income levels show a median of $86,098. The poverty rate stands at 6.67%.
Name | Median | Mean |
|---|---|---|
| Married Families | $110,255 | - |
| Families | $104,096 | $122,801 |
| Households | $86,098 | $104,988 |
| Non Families | $39,127 | $48,312 |
Average Income
Median Household Income
Poverty Rate