Demographics of Sioux County, North Dakota

Sioux County, North Dakota had 3,667 people on July 1, 2025, by the Census Bureau’s estimate: −209 since July 2020. Age, income, poverty, housing and origin below come from the American Community Survey, averaged over 2020–2024, each with its margin of error.

Sioux County, in four figures

3,667
Population: July 1, 2025, Vintage 2025 estimate.; −5.4%
Change since July 2020: −209 people.; 28.2 ±0.6
Median age: ACS 2020–⁠2024.; $42,083 ±$7,116
Median household income: ACS 2020–⁠2024, in 2024 dollars.

Population, year by year

July 1 estimates from the Census Bureau’s Vintage 2025. Each year's change is births less deaths, net moves from abroad and net moves from elsewhere in the country, with the Bureau's small residual. The 2020 row's components run 3 months, from the April census to July 1.

Sioux County, North Dakota's population shrank 5.4% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Sioux County, North Dakota's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).

U.S. Census Bureau — Census Bureau population estimates — counties and Puerto Rico municipios, with components of change

About this chart

The figures

Sioux County, North Dakota's population shrank 5.4% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Sioux County, North Dakota's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).
July 1	Population	Index	United States
2020	3,876	100.0	100.0
2021	3,739	96.5	100.2
2022	3,682	95.0	100.7
2023	3,641	93.9	101.6
2024	3,717	95.9	102.5
2025	3,667	94.6	103.1

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Population of Sioux County, North Dakota on July 1 of each year, Vintage 2025
July 1	Population	Change	Births less deaths	From abroad	From elsewhere in the country
2020	3,876	−17	+1	0	−16
2021	3,739	−137	−12	0	−118
2022	3,682	−57	0	0	−54
2023	3,641	−41	−2	+1	−41
2024	3,717	+76	+5	+8	+64
2025	3,667	−50	+5	+8	−63

Age, 2020–2024

The median age is 28.2 ±0.6: for men 26.3 ±1.6 and for women 28.8 ±0.7. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Sioux County by age, ACS 2020–2024
Age	People	Share	North Dakota	United States
Under 5	301 ±16	8.0% ±0.4	6.3% ±0.1	5.6% ±<0.1
5 to 17	972 ±95	26.0% ±2.5	17.2% ±0.3	16.3% ±<0.1
18 to 24	505 ±91	13.5% ±2.4	11.1% ±0.3	9.1% ±<0.1
25 to 44	752 ±64	20.1% ±1.7	27.4% ±0.3	26.9% ±<0.1
45 to 64	850 ±60	22.7% ±1.6	21.5% ±0.2	24.8% ±<0.1
65 and over	360 ±59	9.6% ±1.6	16.5% ±0.2	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $42,083 ±$7,116, and income per person $21,541 ±$2,476, in 2024 dollars. The median is $76,657 ±$1,163 in North Dakota and $80,734 ±$166 in the United States.

Households by income

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Households in Sioux County by income, ACS 2020–2024
Household income	Households	Share	North Dakota	United States
Under $25,000	351 ±77	31.6% ±6.9	14.4% ±0.5	14.6% ±<0.1
$25,000 to $49,999	255 ±63	22.9% ±5.6	17.9% ±0.6	16.7% ±<0.1
$50,000 to $74,999	164 ±47	14.7% ±4.2	16.6% ±0.5	15.5% ±<0.1
$75,000 to $99,999	129 ±40	11.6% ±3.6	13.9% ±0.4	12.6% ±<0.1
$100,000 to $149,999	133 ±39	12.0% ±3.5	18.6% ±0.6	17.5% ±<0.1
$150,000 to $199,999	13 to 55	1.2% to 4.9%	9.0% ±0.4	9.6% ±<0.1
$200,000 or more	20 to 72	1.8% to 6.5%	9.6% ±0.4	13.4% ±0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Poverty by age

The poverty rate is the share of people whose family income is below the federal threshold for their family’s size, of everyone for whom the Bureau determines it (B17020).

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Poverty rate in Sioux County by age, ACS 2020–2024
Age	Below poverty	Rate	North Dakota	United States
All ages	1,584 ±218	43.3% ±6.0	10.8% ±0.4	12.5% ±0.1
Under 18	721 ±110	57.2% ±4.6	11.1% ±0.7	16.1% ±0.1
18 to 59	664 ±102	36.7% ±4.8	11.2% ±0.4	11.6% ±0.1
60 and over	199 ±44	33.8% ±6.1	9.5% ±0.5	11.0% ±<0.1

Housing, 2020–2024

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Housing in Sioux County, ACS 2020–2024
Measure	Sioux County	North Dakota	United States
Housing units	1,280 ±15	377,281 ±282	143,775,355 ±10,234
Occupied	86.9% ±2.0	87.7% ±0.4	89.9% ±0.1
Vacant	13.1% ±2.3	12.3% ±0.4	10.1% ±0.1
Owner occupied	46.6% ±5.2	62.9% ±0.6	65.2% ±0.3
Renter occupied	53.4% ±5.0	37.1% ±0.7	34.8% ±0.1
Median home value	$85,400 ±$11,826	$249,900 ±$2,909	$332,700 ±$236
Median gross rent	$444 ±$55	$954 ±$11	$1,413 ±$2
Median year built	1984 ±4	1982 ±1	1980 ±1

Occupied and vacant are shares of all housing units; owner and renter occupied are shares of occupied units. Value and rent are medians in 2024 dollars.

Origin and place of birth, 2020–2024

Hispanic or Latino origin is not a race in the Census Bureau’s tables. Here the people of Hispanic origin, of any race, are one row, and everyone else is counted by race alone (B03002), so the rows add to the whole.

Hispanic origin and race

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People in Sioux County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	North Dakota	United States
Hispanic or Latino	22 to 90	0.6% to 2.4%	4.7% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	452 ±23	12.1% ±0.6	81.7% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	2 to 26	0.1% to 0.7%	3.3% ±0.1	11.9% ±<0.1
Asian alone, not Hispanic	0 to 56	0% to 1.5%	1.6% ±0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	3,081 ±56	82.4% ±1.5	4.2% ±0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 10	0% to 0.3%	0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	6 to 52	0.2% to 1.4%	0.3% ±0.1	0.6% ±<0.1
Two or more races, not Hispanic	41 to 125	1.1% to 3.3%	4.0% ±0.2	4.3% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Place of birth and citizenship

“Born a citizen outside the states” counts people born in Puerto Rico, the island areas, or abroad to American parents. Naturalized citizens and those who are not citizens together make up the people born abroad (B05002).

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People in Sioux County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	North Dakota	United States
Born in the state	3,112 ±76	83.2% ±2.0	61.4% ±0.4	57.3% ±<0.1
Born in another state	600 ±72	16.0% ±1.9	32.8% ±0.4	26.9% ±<0.1
Born a citizen outside the states	0 to 10	0% to 0.3%	1.1% ±0.1	1.7% ±<0.1
Born abroad	0 to 62	0% to 1.7%	4.7% ±0.2	14.1% ±<0.1
Naturalized citizens	0 to 6	0% to 0.2%	1.9% ±0.1	7.4% ±<0.1
Not citizens	0 to 58	0% to 1.6%	2.8% ±0.2	6.8% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Sioux County among the counties of North Dakota

30th of 53 by population, July 2025. Every one is listed on the North Dakota page.

Counties of North Dakota near Sioux County in population, July 2025
County	July 2025	Change since 2020
LaMoure County	4,135	+1.0%
Dunn County	4,058	−0.9%
Pierce County	3,838	−3.6%
Wells County	3,729	−5.9%
Sargent County	3,711	−3.4%
Sioux County	3,667	−5.4%
Cavalier County	3,497	−5.4%
Emmons County	3,215	−2.4%
Foster County	3,212	−5.1%
Nelson County	2,963	−1.0%
Bowman County	2,762	−7.1%

Elsewhere on the site

Sources

Census Bureau population estimates — counties and Puerto Rico municipios, with components of change — U.S. Census Bureau · U.S. Government work · retrieved September 25, 2026
American Community Survey 5-year estimates — table-based Summary File · U.S. Government work

Data retrieved September 25, 2026