County · Iowa
Sioux County, Iowa
Sioux County, Iowa. Sioux County had 36,774 residents in 2025 by the Census Bureau's estimate, up 2.5% since 2020, faster than Iowa (+1.5%). It holds 14 places (14 cities, villages and boroughs) and 9 census tracts. GEOID 19167.
Residents, July 2025 estimate
36,774
Census Bureau estimate (no margin published)
2020 Census count: 35,872 · ACS 2020-2024: 36,212
Median household income
$86,098
±$7,089 (90% margin)
Iowa: $75,059
Median home value
$250,100
±$9,233 (90% margin)
Iowa: $208,000
Median gross rent
$908
±$64 (90% margin)
Iowa: $972
How many people live in Sioux County, and is it growing?
The 2020 Census counted 35,872 residents in Sioux County. The Census Bureau estimates 36,774 for July 1, 2025, up 2.5% since 2020, faster than Iowa (+1.5%). The 2020-2024 American Community Survey puts the population at 36,212 over 768 square miles of land.
| Measure | Sioux County | Iowa | Change since 2015-2019 |
|---|---|---|---|
| Total population | 36,212 | 3,210,507 | +1,385 |
| Households | 12,690±181 | 1,315,707 | +442 |
| Average household size | 2.67±0.04 | 2.36 | no clear change |
| Housing units | 13,285±50 | 1,437,699 | +357 |
Sioux County's population since 2000
From 31,589 in 2000 to 36,774 in 2025: up 16.4%. The 2000, 2010 and 2020 figures are census counts. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); PEP Vintage 2025 (CO-EST2025); 2020 Census · Check it at data.census.gov
What cities and towns are in Sioux County?
Sioux County holds 14 places: 14 cities, villages and boroughs (incorporated places). The largest is Sioux Center with 8,864 residents (2025 estimate). Places that cross a county line are listed with the share of their 2020 residents who live in this county.
| Sioux Center | 8,229 | $92,983 |
|---|---|---|
| Orange City | 6,267 | $82,122 |
| Rock Valley | 4,059 | $76,250 |
| Hawarden | 2,700 | $74,167 |
| Hull | 2,384 | $72,344 |
| Alton | 1,248 | $98,036 |
| Hospers | 718 | $69,444 |
| Boyden | 701 | $88,125 |
| IretonGEOID 1938820 | 590 | $71,250 |
| Granville | 310 | $68,750 |
| MauriceGEOID 1950430 | 265 | $68,750 |
| Sheldon | 5,512 | $62,159 |
| ChatsworthGEOID 1912945 | 75 | $44,375 |
| MatlockGEOID 1950385 | 74 | $83,365 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 place-by-county parts · Check it at data.census.gov
Who lives in Sioux County?
The median resident of Sioux County is 33.8 years old; 27.2% are under 18 and 16.2% are 65 or older. The largest group is non-Hispanic white residents at 82.8%, then Hispanic or Latino residents (of any race) at 14.3%. 8.5% of residents were born outside the United States.
| Measure | Sioux County | Iowa | Change since 2015-2019 |
|---|---|---|---|
| Median age | 33.8±0.3 | 38.6 | no clear change |
| Under 18 years | 27.2%±0.1 pts | 22.9% | – |
| 65 years and over | 16.2%±0.2 pts | 18.1% | – |
| Hispanic or Latino (any race) | 14.3% | 7.3% | +3.6 pts |
| White alone, not Hispanic | 82.8%±0.3 pts | 82.3% | −4.1 pts |
| Black or African American alone, not Hispanic | 0.6%±0.1 pts | 3.8% | +0.2 pts |
| Asian alone, not Hispanic | 0.5%±0.2 pts | 2.5% | no clear change |
| American Indian and Alaska Native alone, not Hispanic | 0.1%±0.1 pts | 0.2% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±0.1 pts | 0.2% | – |
| Two or more races, not Hispanic | 1.3%±0.3 pts | 3.5% | – |
| Some other race alone, not Hispanic | 0.3%±0.3 pts | 0.3% | – |
| Born outside the United States | 8.5%±1.0 pts | 5.9% | +2.6 pts |
| Speak a language other than English at home (age 5+) | 12.5%±1.1 pts | 9.1% | – |
| Civilian veterans (age 18+) | 3.7%±0.6 pts | 6.5% | – |
| With a disability | 9.0%±0.8 pts | 12.6% | – |
| No health insurance coverage | 5.8%±1.6 pts | 5.0% | no clear change |
| High school graduate or higher (age 25+) | 90.9%±1.5 pts | 93.3% | – |
| Bachelor's degree or higher (age 25+) | 30.6%±2.2 pts | 31.4% | no clear change |
| Graduate or professional degree (age 25+) | 8.3%±1.1 pts | 10.5% | – |
| Moved from another state in the past year | 1.9%±0.5 pts | 2.2% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Sioux County earn?
Half of Sioux County's 12,690 households earn less than $86,098 a year (±$7,089), against $75,059 in Iowa. In 2015-2019 it was $85,957 in 2024 dollars; the margins of error cannot tell the two periods apart. 6.7% of residents live below the poverty line.
| Measure | Sioux County | Iowa | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $86,098±$7,089 | $75,059 | no clear change |
| Mean household income | $104,988±$4,769 | $98,187 | – |
| Per capita income | $37,166±$1,361 | $40,877 | no clear change |
| People below the poverty line | 6.7%±1.4 pts | 11.1% | no clear change |
| Children under 18 below the poverty line | 6.4%±2.7 pts | 12.9% | no clear change |
| Households receiving SNAP | 2.8%±1.0 pts | 8.8% | – |
| Households with a broadband subscription | 92.4%±1.5 pts | 88.9% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Sioux County?
Owners occupy 76.1% of Sioux County's occupied homes and renters 23.9%. The median owner-occupied home is valued at $250,100 by its owner (±$9,233). The median renter pays $908 a month including utilities, and 24.8% of renters pay 35% or more of their income on rent.
| Measure | Sioux County | Iowa | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $250,100±$9,233 | $208,000 | +$43,959 |
| Median gross rent | $908±$64 | $972 | no clear change |
| Renters paying 35% or more of income on rent | 24.8%±6.7 pts | 35.2% | no clear change |
| Median monthly owner costs, with a mortgage | $1,654±$74 | $1,533 | – |
| Owner-occupied homes | 76.1%±2.1 pts | 71.7% | −4.2 pts |
| Housing units | 13,285±50 | 1,437,699 | +357 |
| Homeowner vacancy rate | 0.0%±0.1 pts | 0.8% | – |
| Rental vacancy rate | 0.4%±0.7 pts | 5.7% | – |
| Single-family detached homes | 79.7%±2.3 pts | 72.2% | – |
| Mobile homes | 1.8%±0.8 pts | 3.2% | – |
| Built 2020 or later | 1.5%±0.7 pts | 1.7% | – |
| Built 1939 or earlier | 21.1%±2.3 pts | 23.5% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How many new homes is Sioux County building?
Builders took permits for 359 new housing units across Sioux County in 2025 (167 single-family), 9.8 per 1,000 residents.
Source: Building Permits Survey, annual county files 2019-2025, U.S. Census Bureau · Census Building Permits Survey
How do people in Sioux County get to work?
76.0% of Sioux County's workers drive alone and 12.8% work from home. The average trip to work takes 13.5 minutes. The unemployment rate in 2020-2024 averaged 1.5%.
| Measure | Sioux County | Iowa | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 70.3%±1.7 pts | 66.4% | – |
| Unemployment rate | 1.5%±0.5 pts | 3.6% | −1.2 pts |
| Drove alone to work | 76.0%±2.1 pts | 76.0% | – |
| Carpooled | 6.0%±1.2 pts | 7.8% | – |
| Public transportation | 0.3%±0.3 pts | 0.7% | – |
| Walked | 3.4%±0.8 pts | 2.9% | – |
| Worked from home | 12.8%±1.8 pts | 11.3% | +2.8 pts |
| Mean travel time to work | 13.5 min±1.2 | 19.8 min | no clear change |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What are Sioux County's census tracts?
Sioux County is divided into 9 census tracts. Among those with a reliable estimate, median household income runs from $71,969 (Tract 707.02) to $102,760 (Tract 705).
| Tract 70119167070100 | 3,974±328 | $84,398 |
|---|---|---|
| Tract 70219167070200 | 5,022±520 | $95,890 |
| Tract 70319167070300 | 6,521±379 | $85,677 |
| Tract 70419167070400 | 3,711±277 | $82,679 |
| Tract 70519167070500 | 3,040±305 | $102,760 |
| Tract 706.0119167070601 | 2,320±210 | $85,875 |
| Tract 706.0219167070602 | 4,083±234 | $80,582 |
| Tract 707.0119167070701 | 3,631±323 | $94,863 |
| Tract 707.0219167070702 | 3,910±330 | $71,969 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · Check it at data.census.gov
How does Sioux County compare with Iowa's other counties?
| Measure | Rank |
|---|---|
| Population | 19th of 99 |
| Growth 2020-2025 | 10th of 99 |
| Residents per square mile | 25th of 99 |
| Median household income | 8th of 99 |
| Median home value | 8th of 99 |
| Median gross rent | 20th of 99 |
| Poverty rate | 94th of 99 |
| Bachelor's degree or higher | 15th of 99 |
| Median age | 97th of 99 |
Source: PlainCities ranks from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Sioux County are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' school search.