Cheyenne County is a county in the U.S. state of Nebraska. As of the 2020 United States Census, the population was 9,468.^[1] Its county seat is Sidney.^[2] The county was formed in 1871^[3] and named for the Cheyenne Native American tribe.

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Cheyenne County
County
Cheyenne County Courthouse in Sidney
Location within the U.S. state of Nebraska
Nebraska's location within the U.S.
Coordinates: 41°13′N 102°59′W
Country	United States
State	Nebraska
Founded	1871
Named for	Cheyenne people
Seat	Sidney
Largest city	Sidney
Area
• Total	1,196 sq mi (3,100 km2)
• Land	1,196 sq mi (3,100 km2)
• Water	0.1 sq mi (0.3 km2)  0.01%
Population  (2020)
• Total	9,468
• Density	7.9/sq mi (3.1/km2)
Time zone	UTC−7 (Mountain)
• Summer (DST)	UTC−6 (MDT)
Congressional district	3rd
Website	www.cheyennecountyne.net

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In the Nebraska license plate system, Cheyenne County is represented by the prefix 39 as it had the 39th-largest number of vehicles registered in the county when the license plate system was established in 1922.

Cheyenne County lies on the south side of Nebraska. Its south boundary line abuts with the north boundary line of the state of Colorado. According to the US Census Bureau, the county has an area of 1,196 square miles (3,100 km²), of which 1,196 square miles (3,100 km²) is land and 0.1 square miles (0.26 km²) (0.01%) is water.^[4]

As of the 2000 United States Census,^[11] there were 9,830 people, 4,071 households, and 2,686 families in the county. The population density was 8 people per square mile (3.1 people/km²). There were 4,569 housing units at an average density of 4 units per square mile (1.5/km²). The racial makeup of the county was 96.34% White, 0.14% Black or African American, 0.65% Native American, 0.40% Asian, 0.03% Pacific Islander, 1.46% from other races, and 0.98% from two or more races. 4.46% of the population were Hispanic or Latino of any race. 45.3% were of German, 9.1% English, 7.6% Irish and 7.5% American.

There were 4,071 households, out of which 31.10% had children under the age of 18 living with them, 54.80% were married couples living together, 8.00% had a female householder with no husband present, and 34.00% were non-families. 30.10% of all households were made up of individuals, and 13.30% had someone living alone who was 65 years of age or older. The average household size was 2.38 and the average family size was 2.96.

The county population contained 26.30% under the age of 18, 7.00% from 18 to 24, 26.70% from 25 to 44, 22.80% from 45 to 64, and 17.20% who were 65 years of age or older. The median age was 39 years. For every 100 females there were 96.00 males. For every 100 females age 18 and over, there were 92.20 males.

The median income for a household in the county was $33,438, and the median income for a family was $41,024. Males had a median income of $30,000 versus $20,467 for females. The per capita income for the county was $17,437. About 8.20% of families and 10.00% of the population were below the poverty line, including 11.80% of those under age 18 and 7.40% of those age 65 or over.

Cheyenne County voters are reliably Republican. In no national election since 1936 has the county selected the Democratic Party candidate, and only four total since 1900.

• National Register of Historic Places listings in Cheyenne County, Nebraska