What is the largest city in Sioux County, IA?

Sioux Center is the largest city or town in Sioux County, with about 8,454 residents.

How many ZIP codes are in Sioux County?

Sioux County includes 13 ZIP Code Tabulation Areas, including 51003, 51011, 51022, 51023, 51027.

What is the population of Sioux County, IA?

About 36,212 people live in Sioux County, based on American Community Survey 5-year estimates.

What counties border Sioux County?

Sioux County borders Lincoln County, SD, Plymouth County, Union County, SD, O'Brien County, Lyon County, Cherokee County, Osceola County.

Sioux County, IA: Cities, ZIP Codes & Local Data

Population

36,212

Land area

768sq mi

People per sq mi

47

ZIP codes

13

Sioux County at a glance

By population, it ranks 19th among 99 counties in Iowa.
The median household income is $86,098, 15% above the Iowa median of $75,059.
A typical owner-occupied home is valued at $250,100 (20% above Iowa) and median rent is $908 a month.
Its largest cities are Sioux Center (8,454), Orange City (6,426) and Rock Valley (4,059).

Local data for Sioux County, IA

Counts from official public data

Housing and community stats

Sioux County, IA, American Community Survey 2020-2024

Full profile

Median household income

$86,098

Poverty rate

6.7%

Median home value

$250,100

Prices +6.1% in a year

Median rent

$908/mo

Homeownership

76.1%

Bachelor's or higher

30.6%

Median age

33.8

Average commute

13.5 min

Largest reported origins and ancestries: Dutch Americans (14,759), German Americans (7,775), Mexican Americans (3,942).

Home values and rents Income, education and commute

Economy and federal money

Jobs, income, federal spending and pandemic loans

Details

Unemployment rate

2.1%

Sep 2026, +0.3 pts in a year

Average annual pay

$57,985

23,005 jobs, 2025

Income per person

$72,752

BEA, 2024

Federal spending

$201M

FY 2026, $5,600 per person

PPP loans

$197M

4,027 loans, 21,476 jobs reported

Campaign donations

$313K

Itemized, 2026 cycle

Economy Federal spending PPP loans

How people get to work

Sioux County, IA, workers 16 and older. American Community Survey 5-year estimates

Drove alone76.0%
Carpooled6.0%
Public transit0.3%
Walked3.4%
Bicycle0.6%
Taxi, ride-hailing, motorcycle or other0.9%
Worked from home12.8%

Average one-way commute: 13.5 minutes for people who do not work from home.

Environment and hazard risk

Sioux County, IA, from FEMA, NOAA and EPA

Full report

Natural hazard risk

Relatively Low

Top: hail

Storm events since 1996

958

Most often hail

Flood insurance policies

151

1.2% of homes, county

July high / Jan low

85° / 9°F

29.8 inches of rain a year

Hazards, floods and storm history Check a flood zone 4 historic places

Health statistics

Share of adults in Sioux County, IA, CDC PLACES estimates

All 40 measures

Obesity

33.0%

U.S. 33.3% about the same

Diabetes

9.8%

U.S. 12.1% -2.3 pts

Smoking

12.9%

U.S. 12.8% about the same

Uninsured (18-64)

7.9%

U.S. 11.1% -3.2 pts

Cities, towns and ZIP codes in Sioux County

Population shown

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Frequently asked questions

What is the largest city in Sioux County, IA?: Sioux Center is the largest city or town in Sioux County, with about 8,454 residents.
How many ZIP codes are in Sioux County?: Sioux County includes 13 ZIP Code Tabulation Areas, including 51003, 51011, 51022, 51023, 51027.
What is the population of Sioux County, IA?: About 36,212 people live in Sioux County, based on American Community Survey 5-year estimates.
What counties border Sioux County?: Sioux County borders Lincoln County, SD, Plymouth County, Union County, SD, O'Brien County, Lyon County, Cherokee County, Osceola County.