Sioux County is a county in the U.S. state of Nebraska. As of the 2020 United States Census, the population was 1,135.^[1] Its county seat is Harrison.^[2]

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Sioux County
County
Sioux County Courthouse in Harrison
Location within the U.S. state of Nebraska
Nebraska's location within the U.S.
Coordinates: 42°29′N 103°46′W
Country	United States
State	Nebraska
Founded	1877
Named for	Sioux people
Seat	Harrison
Largest village	Harrison
Area
• Total	2,067 sq mi (5,350 km2)
• Land	2,067 sq mi (5,350 km2)
• Water	0.7 sq mi (2 km2)  0.03%
Population  (2020)
• Total	1,135
• Estimate  (2022)	1,127
• Density	0.55/sq mi (0.21/km2)
Time zone	UTC−7 (Mountain)
• Summer (DST)	UTC−6 (MDT)
Congressional district	3rd

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Sioux County is included in the Scottsbluff, NE Micropolitan Statistical Area.

In the Nebraska license plate system, Sioux County is represented by the prefix 80 (it had the 80th-largest number of vehicles registered in the state when the license plate system was established in 1922).

Sioux County lies at the NW corner of Nebraska. Its north boundary line abuts the south line of the state of South Dakota and its west boundary line abuts the east boundary line of the state of Wyoming. The Niobrara River flows southeastward and eastward through the upper central part of the county. The county terrain is arid low rolling hills, sloping to the east and southeast.^[3] The terrain is sparsely utilized for agriculture, with some center pivot irrigation used.^[4] The county has an area of 2,067 square miles (5,350 km²), of which 2,067 square miles (5,350 km²) is land and 0.7 square miles (1.8 km²) (0.03%) is water.^[5]

As of the 2000 United States Census,^[15] there were 1,475 people, 605 households, and 444 families in the county. The population density was 0.7 person per square mile (0.27 person/km²). There were 780 housing units at an average density of 0.4 units per square mile (0.15/km²). The racial makeup of the county was 97.63% White, 0.14% Native American, 0.20% Asian, 1.15% from other races, and 0.88% from two or more races. 2.31% of the population were Hispanic or Latino of any race. 36.9% were of German, 11.3% Irish, 11.0% American and 10.6% English ancestry.

There were 605 households, out of which 28.10% had children under the age of 18 living with them, 65.30% were married couples living together, 5.10% had a female householder with no husband present, and 26.60% were non-families. 23.60% of all households were made up of individuals, and 9.40% had someone living alone who was 65 years of age or older. The average household size was 2.44 and the average family size was 2.86.

The county population contained 24.30% under the age of 18, 7.20% from 18 to 24, 24.70% from 25 to 44, 27.50% from 45 to 64, and 16.20% who were 65 years of age or older. The median age was 42 years. For every 100 females there were 111.00 males. For every 100 females age 18 and over, there were 102.20 males.

The median income for a household in the county was $29,851, and the median income for a family was $31,406. Males had a median income of $23,409 versus $21,490 for females. The per capita income for the county was $15,999. About 11.10% of families and 15.40% of the population were below the poverty line, including 24.40% of those under age 18 and 7.50% of those age 65 or over.

Sioux County voters are reliably Republican. In no national election since 1936 has the county selected the Democratic Party candidate. In 2020, Donald Trump won the highest share of the vote ever in the county, with 87.8% of the vote.

• National Register of Historic Places listings in Sioux County NE