Sioux County, Iowa Demographics

Population trends, housing costs, income, commuting, and health, all on one page.

Sioux County, IA Population Density Map and Area Scores

Area Score

Health, income and education, each graded from F to A+. Explore interactive maps for deeper analysis.

  • A
    Health Above average
    Among the top 5 healthiest counties in Iowa
  • B
    Income Around average
    Wealthier than 83% of counties in Iowa
  • C
    Education Below average
    Better educated than 85% of counties in Iowa

Source: Map AI Methodology

Sioux County
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Population density, people per sq mi

Population: density and quick facts

Metric Sioux County Iowa Avg U.S. Average
Population 36,212 3,204,793 337,468,954
Population density (per sq mi) 47.1 57.0 86.4
Population growth (%/yr) 0.57% 0.41% 0.59%
Median age 32.2 36.8 37.3
Households 12,690 1,308,457 130,235,071

Population Growth 2009–2024

Year Sioux County

Race & Ethnicity

Group Share

Age & Sex

The largest generation in Sioux County is Gen Z, aged 13–28, at 25.7% of residents. That is 3.4 points above Iowa as a whole.

Residents by birth cohort, from the 2025 age distribution. The right-hand figure is how far each cohort's share sits above or below Iowa, in percentage points. Children younger than Gen Z and the generations before the Boomers are counted in the population but not shown here, so these shares do not add up to 100%.

Male and female share

Women are 49.8% of the people living in Sioux County and men 50.2%.

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Economy

Sioux County has a the economy index of B, which means it is quite prosperous.

Metric Sioux County Iowa Avg U.S. Average
Median household income $88,224 $75,133 $80,455
Income growth (%/yr) 4.21% 3.99% 4.80%
Unemployment rate 1.5% 3.6% 5.2%

The median household income in Sioux County is about 17% higher than in Iowa.

Detailed wealth and income breakdown →

Housing

Metric Sioux County Iowa Avg U.S. Average
Median home price $13,749 $153,425 $248,835
Median rent $908 $971 $1,407
Homeownership rate 76.1% 71.7% 65.2%

The median home price in Sioux County is about 1.3 years' worth of rent — buying at the median price costs roughly as much as paying the median rent of $908 per month for that long.

Full housing market analysis →

Commute Time & Mobility

Commuters in Sioux County spend about 20 minutes on the road round trip each working day. Over a typical 250-day work year, that adds up to roughly 84 hours, about 3.5 full days, spent commuting.

Metric Sioux County Iowa Avg U.S. Average
One-way commute (min) 10.1 17.0 22.4
Round-trip commute (min) 20.2 33.9 44.8
Yearly time spent (hours) 84 141 187
Estimated yearly cost $2,615 $4,382 $5,790
Work from home 12.8% 11.3% 15.0%
Highway traffic (vehicles/day) 1,842 4,993 8,813
Local road traffic (vehicles/day) 362 606 1,355

Fastest commutes among counties in Iowa: Sioux County (10.1 min), Union County (10.4 min), Cass County (10.6 min).
Slowest: Monroe County (30.4 min), Madison County (30.1 min), Mills County (26.7 min).

The average commute time in Sioux County is 10 minutes, shorter than the 17 minutes in Iowa.

Estimated yearly cost applies a single national wage rule of thumb (U.S. Bureau of Labor Statistics average hourly earnings), not a measurement of wages in this area. Traffic volume figures come from proprietary Ticon and TrafficZoom data.

Commute and transport details →

Education & Households

Sioux County has a education index of C, which means it is somewhat educated.

Metric Sioux County Iowa Avg U.S. Average
Bachelor's degree or higher 27.8% 27.9% 31.6%
Average household size 2.67 2.37 2.53

Highest education index among counties in Iowa: Johnson County (0.4), Dallas County (0.4), Story County (0.4).
Lowest: Crawford County (0.2), Wayne County (0.2), Louisa County (0.2).

Health

Sioux County has a health index of A, which means it is very healthy.

Metric Sioux County Iowa Avg U.S. Average
Life expectancy (years) 82.2 79.2 78.3
Self-rated poor health 11.0% 13.6% 16.3%
Smokers 15.1% 17.6% 19.0%

Highest health index among counties in Iowa: Johnson County (0.8), Story County (0.8), Winneshiek County (0.8).
Lowest: Davis County (0.8), Wayne County (0.8), Appanoose County (0.8).

Full health data →

Sioux County, IA Compared With Nearby Counties

How Sioux County, IA compares with the 2 counties closest to it.

Area Population Median household income Median home price Commute
Sioux County, IA 36,212 $88,224 #2/3 $13,749 #3/3 10.1 min #1/3
Plymouth County, IA 25,747 $83,321 $28,068 16.0 min
Lincoln County, SD 70,639 $98,826 $337,722 18.1 min

Frequently Asked Questions

Common questions about Sioux County, Iowa.

How many people live in Sioux County, Iowa?

About 36,212 people live in Sioux County, Iowa, in 12,690 households of 2.7 people on average. The median age is 32.2, so residents are younger than the U.S. median of 37.3 by about 5 years.

Is Sioux County, Iowa urban or rural?

Averaged over its land area, Sioux County, Iowa has 47 people per square mile, a density typical of rural areas. That is about 54% of the U.S. average of 86.

Can a typical household afford a home in Sioux County, Iowa?

The median home costs 0.2 times the median household income ($13,749 against $88,224), compared with 3.1 times nationally. That is within the traditional rule of thumb of about 3 times income. Median rent of $908 a month takes about 12% of the median household's income, below the 30% level at which HUD considers renters cost-burdened.

Is unemployment high in Sioux County, Iowa?

Unemployment in Sioux County, Iowa is only 1.5%, well below the U.S. rate of 5.2%, a sign of a tight labor market where employers compete for workers.

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