Sioux County, Iowa Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 19th-largest in Iowa
The population of Sioux County, Iowa is 35,984 as of the 2023 American Community Survey, making it the 19th-largest county in Iowa. The median household income is $84,736, the median home value is $235,600, and the median age is 34.0.
The population of Sioux County has grown 8.3% since 2010 (33,755 → 36,554), a +0.57% annualized rate.
35,984
Population
+0.57%
Annual growth
47
People / sq mi
$84,736
Median Income
$235,600
Median Home Value
Sioux County covers 768 sq mi of land at 46.9 people per square mile.
About Sioux County, IA
Sioux County is a county in Iowa with a population of 35,984. It ranks #19 among counties in Iowa by population. The median age is 34.0, younger than the national median. The population is 50.2% male and 49.8% female.
The median household income in Sioux County is $84,736, above the US median of $74,580. 3.9% of residents live below the federal poverty level. Home values sit at a median of $235,600, with monthly rent averaging $888. The homeownership rate of 77.8% is higher than the national rate of 64.8%.
Educational attainment in Sioux County reflects 30.4% of adults 25 and older holding a bachelor's degree or higher, below the national average of 34.3%. Roughly 13.3% of workers primarily work from home, similar to the national work-from-home rate of 14.2%. The average commute is 12.7 minutes each way.
Sioux County Population History (2010-2024)
The county of Sioux County had a population of 33,755 in 2010 and 36,554 in 2024, a 8.3% growth over 14 years. The peak was 36,554 in 2024. Average annual growth rate: 0.57%.
36,554
Population (2024)
33,755
Population (2010)
36,554
Peak (2024)
0.57%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 33,755 |
| 2011 | 34,022 |
| 2012 | 34,289 |
| 2013 | 34,511 |
| 2014 | 34,648 |
| 2015 | 34,764 |
| 2016 | 34,955 |
| 2017 | 34,784 |
| 2018 | 34,767 |
| 2019 | 34,950 |
| 2020 | 35,897 |
| 2021 | 35,979 |
| 2022 | 36,231 |
| 2023 | 36,399 |
| 2024 | 36,554 |
Race & Ethnicity
| White | 87.8% |
| Black or African American | 0.6% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 1.3% |
| Two or More Races | 0.0% |
Age & Sex
34.0
Median Age
49.8%
Female
50.2%
Male
15.9%
Age 65+
Age Distribution
Children (under 15): 22.5% · Seniors (65+): 15.9%
Income & Poverty
| Median household income | $84,736+$11,589 vs state |
| Mean household income | $104,234 |
| Per-capita income | $36,175 |
| Poverty rate | 3.9%-3.0% vs state |
| Unemployment rate | 1.4% |
| Employment-to-population | 70.0% |
Top Industries by Employment
The largest employment sector in Sioux County is professional & business services, accounting for 24.5% of workers.
How residents commute
0.3%
Drive alone
3.5%
Carpool
74.3%
Public transit
13.3%
Work from home
12.7 min
Avg commute
Housing
$235,600+$39,700 vs state
Median home value
$888
Median rent
77.8%
Homeownership rate
13,175
Total housing units
95.5%
Occupied
4.5%
Vacant
22.2%
Renter-occupied
Social & access
94.3%
With health insurance
94.1%
With broadband internet
25.1%
Foreign-born
4.3%
Veterans (18+)
9.1%
With a disability
89.6%
Speak language other than English at home
Education
90.6%
High School+
30.4%
Bachelor's+
Largest cities in Iowa
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Part of Iowa
Metro areas in Iowa
County rankings
Frequently Asked Questions
Sioux County, Iowa has a population of 35,984 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 19th-largest county in Iowa. Population density is 47 people per square mile.
The population of Sioux County has grown 8.3% since 2010 (33,755 → 36,554), a +0.57% annualized rate.
The median household income in Sioux County, Iowa is $84,736, with mean (average) household income of $104,234 and per-capita income of $36,175. 3.9% of residents live below the federal poverty level.
In Sioux County, the largest racial and ethnic groups are White (87.8%), Hispanic or Latino (1.3%), Black or African American (0.6%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Sioux County, Iowa is 34.0 years. Residents are 49.8% female and 50.2% male.
The median home value in Sioux County is $235,600 and median monthly rent is $888. 77.8% of occupied housing units are owner-occupied. The county has 13,175 total housing units, 4.5% of which are vacant.
The largest employment sector in Sioux County, Iowa is professional, scientific, and management services, employing 24.5% of workers. The unemployment rate is 1.4%.
Des Moines is among the largest cities associated with Sioux County, Iowa, with a population of 212,464.
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Statewide data for Iowa
Population, race, income, age, and trends across Iowa
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.