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
The poverty rate is what most separates Sioux County from the typical county: 3.9% of residents live below the federal poverty line, against 12.4% nationally. Sioux County is a county in Iowa with a population of 35,984. It ranks #19 among counties in Iowa by population.
Median household income is $84,736, above the US median of $78,538. Very few residents live in poverty — 3.9%, below the national 12.4%. Home values run above average at $235,600, with typical rent around $888.
College attainment is above the local norm at 30.4%, below the national 35.0%. A solid 13.3% of workers are based at home, close to the national 14.0%, and the average commute runs about 13 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
Other counties in Iowa
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.
Sioux County, IA Climate
Sioux County, IA has an average annual temperature of 8.1°C (47°F) and receives about 683 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
8.1°C
Avg Temp
683
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -9° / 16° | 15 mm |
| February | -5° / 22° | 17 mm |
| March | 1° / 34° | 48 mm |
| April | 9° / 48° | 64 mm |
| May | 16° / 60° | 86 mm |
| June | 21° / 70° | 108 mm |
| July | 23° / 73° | 87 mm |
| August | 22° / 71° | 85 mm |
| September | 17° / 62° | 74 mm |
| October | 10° / 50° | 49 mm |
| November | 1° / 33° | 30 mm |
| December | -7° / 20° | 20 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit Sioux County, IA
The most comfortable months to visit Sioux County, IA are typically August, June and July, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 29°C high). The coldest is January (near -15°C low). June is usually the wettest month.
Where to stay near Sioux County
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.