Sioux County, Iowa

Sioux County, Iowa, had an estimated population of 36,774 in 2025 across 1,989 km². The figures below come from the US Census Bureau's population estimates and the American Community Survey, each shown with its own vintage and its rank among Iowa's counties and nationally.

Population: 36,774; 2025 estimate
Area: 1,989 km²
Density: 18; per km²
Median income: $86,098; household, ACS 2024
Median age: 33.8; years, ACS 2024

How Iowa's counties spread

Amenities & Infrastructure

Indicator	Value	In Iowa	In the US
Households with Broadband2024	92.4%	2 / 99	377 / 3,144
Median Gross Rent2024	$908	20 / 99	1,390 / 3,137
Median Home Value2024	$250,100	8 / 99	890 / 3,139
Owner-Occupied Homes2024	76.1%	54 / 99	1,320 / 3,144
Vacant Homes2024	4.5%	99 / 99	3,026 / 3,144

Demography

Indicator	Value	In Iowa	In the US
Aged 65 and Over2024	16.2%	94 / 99	2,578 / 3,144
American Indian & Alaska Native2024	0.1%	28 / 99	1,566 / 3,144
Asian, non-Hispanic2024	0.5%	53 / 99	1,745 / 3,144
Average Household Size2024people	2.7	3 / 99	425 / 3,144
Black, non-Hispanic2024	0.6%	60 / 99	2,332 / 3,144
Foreign-Born2024	8.5%	12 / 99	512 / 3,144
Hispanic or Latino2024	14.3%	10 / 99	620 / 3,144
Median Age2024years	33.8	97 / 99	2,962 / 3,144
Sex Ratio2024per 1,000 males	977	57 / 99	2,079 / 3,144
Speak a Language Other Than English2024	12.5%	17 / 99	721 / 3,144
Under 182024	27.2%	3 / 99	165 / 3,144
Veterans2024	3.7%	99 / 99	3,020 / 3,144
White, non-Hispanic2024	82.8%	80 / 99	1,428 / 3,144

Economy

Indicator	Value	In Iowa	In the US
Below Poverty Line2024	6.7%	94 / 99	2,964 / 3,144
Households on SNAP2024	2.8%	99 / 99	3,073 / 3,144
Income Inequality2024index	0.409	79 / 99	2,734 / 3,144
Median Household Income2024	$86,098	8 / 99	401 / 3,143
Per Capita Income2024	$37,166	61 / 99	1,230 / 3,144
Unemployment Rate2024	1.5%	92 / 99	2,966 / 3,144

Education

Indicator	Value	In Iowa	In the US
Bachelor's Degree or Higher2024	30.6%	15 / 99	712 / 3,144
High School or Higher2024	90.9%	80 / 99	1,371 / 3,144

Health Coverage

Indicator	Value	In Iowa	In the US
No Health Insurance2024	5.8%	28 / 99	2,200 / 3,144
With a Disability2024	9.0%	98 / 99	3,073 / 3,144

Population & Density

Indicator	Value	In Iowa	In the US
Population2025	36,774	19 / 99	1,275 / 3,144
Population Density2025/km²	18	23 / 99	1,518 / 3,144

Work & Commute

Indicator	Value	In Iowa	In the US
Commute by Public Transit2024	0.3%	29 / 99	1,112 / 3,144
Households with No Vehicle2024	2.9%	92 / 99	2,808 / 3,144
Mean Commute Time2024minutes	13.5	99 / 99	3,070 / 3,143
Work from Home2024	12.8%	9 / 99	659 / 3,144

Other counties of Iowa

Compare Sioux County against every other county on a map, add layers and run a scatter — open the atlas. Sources and vintages for every figure on this page are listed under datasets, or browse all 3,144 counties.