Geography
Sioux County lies on the south line of North Dakota. Its south boundary line abuts the north boundary line of the state of South Dakota. Its north boundary line is formed by the east-northeastward-flowing Cedar Creek, which discharges into the Missouri River at the county's northeast corner, and its east boundary line is formed by the south-southeast-flowing Missouri River, which also forms Lake Oahe along the county boundary line. Porcupine Creek flows southeastward into the Missouri River, draining the northeastern part of the county. The county terrain consists of low rolling hills etched with gullies and drainages; the area is mostly devoted to agriculture. [6] The terrain slopes to the east and south; its highest point is on the west line, near the southwestern corner of the county, at 2,602 ft (793 m) ASL. [7]
According to the United States Census Bureau, the county has a total area of 1,128.203 square miles (2,922.03 km2), of which 1,094.052 square miles (2,833.58 km2) is land and 34.151 square miles (88.45 km2) (3.03%) is water. [8] It is the 34th largest county in North Dakota by total area. [9]
The southwest corner counties of North Dakota (Adams, Billings, Bowman, Golden Valley, Grant, Hettinger, Slope, and Stark) observe Mountain Time. The counties of McKenzie, Dunn, and Sioux are split, observing Mountain Time in their western portions.
Demographics
Historical population| Census | Pop. | Note | %± |
|---|
| 1920 | 3,308 | | — |
|---|
| 1930 | 4,687 | | 41.7% |
|---|
| 1940 | 4,419 | | −5.7% |
|---|
| 1950 | 3,696 | | −16.4% |
|---|
| 1960 | 3,662 | | −0.9% |
|---|
| 1970 | 3,632 | | −0.8% |
|---|
| 1980 | 3,620 | | −0.3% |
|---|
| 1990 | 3,761 | | 3.9% |
|---|
| 2000 | 4,044 | | 7.5% |
|---|
| 2010 | 4,153 | | 2.7% |
|---|
| 2020 | 3,898 | | −6.1% |
|---|
| 2024 (est.) | 3,713 | [10] | −4.7% |
|---|
|
As of the fourth quarter of 2024, the median home value in Sioux County was $92,605. [15]
As of the 2023 American Community Survey, there are 1,067 estimated households in Sioux County with an average of 3.50 persons per household. The county has a median household income of $41,676. Approximately 34.9% of the county's population lives at or below the poverty line. Sioux County has an estimated 50.9% employment rate, with 11.2% of the population holding a bachelor's degree or higher and 86.9% holding a high school diploma. [2]
The top five reported ancestries (people were allowed to report up to two ancestries, thus the figures will generally add to more than 100%) were English (92.7%), Spanish (0.3%), Indo-European (0.2%), Asian and Pacific Islander (0.0%), and Other (6.7%).
The median age in the county was 28.7 years.
Sioux County, North Dakota – racial and ethnic composition
Note: the US Census treats Hispanic/Latino as an ethnic category. This table excludes Latinos from the racial categories and assigns them to a separate category. Hispanics/Latinos may be of any race.
| Race / ethnicity (NH = non-Hispanic) | Pop. 1980 [16] | Pop. 1990 [17] | Pop. 2000 [18] | Pop. 2010 [19] | Pop. 2020 [20] |
|---|
| White alone (NH) | 1,265
(34.94%) | 905
(24.06%) | 577
(14.27%) | 517
(12.45%) | 401
(10.29%) |
| Black or African American alone (NH) | 0
(0.00%) | 3
(0.08%) | 1
(0.02%) | 6
(0.14%) | 3
(0.08%) |
| Native American or Alaska Native alone (NH) | 2,329
(64.34%) | 2,812
(74.77%) | 3,365
(83.21%) | 3,433
(82.66%) | 3,281
(84.17%) |
| Asian alone (NH) | 5
(0.14%) | 12
(0.32%) | 1
(0.02%) | 4
(0.10%) | 2
(0.05%) |
| Pacific Islander alone (NH) | — | — | 2
(0.05%) | 0
(0.00%) | 0
(0.00%) |
| Other race alone (NH) | 0
(0.00%) | 0
(0.00%) | 0
(0.00%) | 0
(0.00%) | 0
(0.00%) |
| Mixed race or multiracial (NH) | — | — | 33
(0.82%) | 111
(2.67%) | 148
(3.80%) |
| Hispanic or Latino (any race) | 21
(0.58%) | 29
(0.77%) | 65
(1.61%) | 82
(1.97%) | 63
(1.62%) |
| Total | 3,620
(100.00%) | 3,761
(100.00%) | 4,044
(100.00%) | 4,153
(100.00%) | 3,898
(100.00%) |
2020 census
As of the 2020 census, there were 3,898 people, 1,103 households, and 791 families residing in the county. [21] The population density was 3.6 inhabitants per square mile (1.4/km2). There were 1,277 housing units at an average density of 1.2 per square mile (0.5/km2). The racial makeup of the county was 10.29% White, 0.08% African American, 85.48% Native American , 0.05% Asian, 0.00% Pacific Islander, 0.13% from some other races and 3.98% from two or more races. Hispanic or Latino people of any race were 1.97% of the population. [22]
2010 census
As of the 2010 census, there were 4,153 people, 1,158 households, and 900 families in the county. The population density was 3.8 inhabitants per square mile (1.5/km2). There were 1,311 housing units at an average density of 1.2 per square mile (0.5/km2). The racial makeup of the county was 12.64% White, 0.17% African American, 84.08% Native American , 0.10% Asian, 0.05% Pacific Islander, 0.10% from some other races and 2.87% from two or more races. Hispanic or Latino people of any race were 1.61% of the population. In terms of ancestry, 13.5% were German, and 0.3% were American.
Of the 1,158 households, 54.1% had children under the age of 18 living with them, 32.5% were married couples living together, 31.6% had a female householder with no husband present, 22.3% were non-families, and 17.4% of all households were made up of individuals. The average household size was 3.55 and the average family size was 3.89. The median age was 26.3 years.
The median income for a household in the county was $30,990 and the median income for a family was $31,098. Males had a median income of $31,894 versus $26,619 for females. The per capita income for the county was $13,542. About 39.0% of families and 47.2% of the population were below the poverty line, including 58.4% of those under age 18 and 36.1% of those age 65 or over.
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