Sioux County, Iowa
Located in Iowa, Sioux County has a population of 36,212 residents and a median age of 33.8 years, making it the #1,312 most populous county out of 3,222 nationwide. In terms of economic indicators, the county has a poverty rate of 6.7%. The median home value is $250,100, and the median household income is $86,098, which is 15% above the national median.
Demographics
Sioux County has a population of 36,212, making it the #1,312 most populous county in the US. The median age is 33.8 years, which is 13.1% below the national median.
Population Trend
Rankings →Year-over-Year Population Growth
Age & Sex Distribution
Race & Ethnicity
Nativity
Geographic Mobility (Past Year)
Economy
The median household income in Sioux County is $86,098, ranking #401 out of 3,222 counties — 14.6% above the national median. The poverty rate is 6.7% and unemployment stands at 1.5%.
Median Household Income Trend
Rankings →Income Distribution
Industry of Employment
Occupation
Housing
The median home value in Sioux County is $250,100 (-11.3% vs national). Renters pay a median of $908/mo and the homeownership rate is 76.1%.
Median Home Value Trend
Rankings →Household Type
Education
In Sioux County, 30.6% of adults age 25+ hold a bachelor's degree or higher, which is 9.3% below the national average, ranking #727 out of 3,222 counties.
Bachelor's Degree or Higher Trend
Rankings →Health & Wellbeing
Life expectancy in Sioux County is 82.6 years. 14.7% of adults report poor or fair health and 6.0% lack health insurance. Data from County Health Rankings (2025).
Life Expectancy Trend
Substance Use
15.8% of adults in Sioux County smoke , 34.0% are obese , and 23.7% report excessive drinking.
Adult Smoking Trend
Safety
The suicide rate is 10.4 per 100,000. Motor vehicle deaths occur at a rate of 12.6 per 100,000.
Suicide Rate Trend
Families & Children
6.4% of children in Sioux County live in poverty and the infant mortality rate is 6.0 per 1,000 live births. The teen birth rate is 15.6 per 1,000 females age 15–19.
Teen Birth Rate Trend
Civic & Transportation
Voter turnout in Sioux County is 78.8%. The mean commute time is 15.2 min, which is 44.8% below the national average.
Voter Turnout Trend
Mean Commute Time Trend
Rankings →Elections
In the 2024 presidential election, Sioux County voted Republican with a margin of 71.1%. The vote was 13.9% Dem / 85% Rep. Compared to 2020, the margin shifted 4.6 toward Republicans .
Vote Share Over Time
About Sioux County, Iowa
Sioux County, Iowa has a total population of 36,212, making it the 1,312th most populous county in the United States. The median age in Sioux County is 33.8 years, which is 13.1% below the national median of 38.9 years.
The median household income in Sioux County is $86,098, which ranks #401 of 3,222 counties nationwide. This is 14.6% above the national median of $75,149. The poverty rate is 6.7%, lower than the national rate of 12.6%. The unemployment rate stands at 1.5%.
The median home value in Sioux County is $250,100, 11.3% below the national median. Renters in Sioux County pay a median gross rent of $908 per month. The homeownership rate is 76.1%, compared to the national rate of 64.4%.
In Sioux County, 30.6% of residents aged 25 and older hold a bachelor's degree or higher, 9.3% below the national average of 33.7%. Health insurance coverage stands at 94.2% of the population. The average commute time for workers is 15.2 min.
Sioux County is a diverse community. The largest racial or ethnic group is White (non-Hispanic) at 82.8% of the population, followed by Hispanic or Latino (14.3%) and Two or More Races (1.3%).
All data for Sioux County, Iowa comes from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates. These figures are estimates based on survey sampling and are subject to margin of error. For the most detailed and up-to-date data, visit the Census Bureau's official data portal.