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Big Horn County, Montana facts for kids

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Big Horn County
Hotel Becker in Hardin, Montana
Map of Montana highlighting Big Horn County
Location within the U.S. state of Montana
Map of the United States highlighting Montana
Montana's location within the U.S.
Country  United States
State  Montana
Founded January 13, 1913
Named for Bighorn sheep
Seat Hardin
Largest city Hardin
 • Total 5,015 sq mi (12,990 km2)
 • Land 4,995 sq mi (12,940 km2)
 • Water 19 sq mi (50 km2)  0.4%
 • Total 13,124
 • Density 2.6169/sq mi (1.01041/km2)
Time zone UTC−7 (Mountain)
 • Summer (DST) UTC−6 (MDT)
Congressional district At-large
  • Montana county number 22

Big Horn County is a county located in the U.S. state of Montana. As of the 2020 United States Census, the population was 13,124. The county seat is Hardin. The county, like the river and the mountain range, is named after the bighorn sheep in the Rocky Mountains. The county was founded in 1913. It is located on the south line of the state.

Most of the area is part of the Crow Indian Reservation. Reservation poverty affects the county, which is the second-poorest county in the state.


According to the U.S. Census Bureau, the county has a total area of 5,015 square miles (12,990 km2), of which 4,995 square miles (12,940 km2) is land and 19 square miles (49 km2) (0.4%) is water. It is the fifth-largest county in Montana by land area. Most of the county's land area comprises Indian reservations: The Crow Indian Reservation covers 64.2 percent of its area, while the Northern Cheyenne Indian Reservation covers another 6.37 percent.

The county is home to the Big Horn, Pryor and Wolf mountain ranges.

Major highways

  • I-90.svg Interstate 90
  • US 87.svg U.S. Highway 87
  • US 212.svg U.S. Highway 212
  • Montana Highway 313
  • Montana Highway 314
  • MT-47.svg Montana Highway 47

Adjacent counties

Big Horn County in Montana and Wyoming are two of twenty-two counties or parishes in the United States with the same name to border each other across state lines. The others are Sabine County, Texas and Sabine Parish, Louisiana, Union County, Arkansas and Union Parish, Louisiana, Bristol County, Massachusetts and Bristol County, Rhode Island, Kent County, Maryland and Kent County, Delaware, Escambia County, Alabama and Escambia County, Florida, Pike County, Illinois and Pike County, Missouri, Teton County, Idaho and Teton County, Wyoming, Park County, Montana and Park County, Wyoming, San Juan County, New Mexico and San Juan County, Utah, and Vermilion County, Illinois and Vermillion County, Indiana. respectively. (Note, despite the different spellings, the source of the name is the same for Vermilion County, Illinois and Vermillion County, Indiana—the Vermillion River which flows through both counties.)

National protected areas


According to the Köppen Climate Classification system, Big Horn County has a semi-arid climate, abbreviated "BSk" on climate maps.


Historical population
Census Pop.
1920 7,015
1930 8,543 21.8%
1940 10,419 22.0%
1950 9,824 −5.7%
1960 10,007 1.9%
1970 10,057 0.5%
1980 11,096 10.3%
1990 11,337 2.2%
2000 12,671 11.8%
2010 12,865 1.5%
2020 13,124 2.0%
US Decennial Census
1790-1960 1900-1990
1990-2000 2010-2020

2010 census

As of the 2010 United States Census, there were 12,865 people, 4,004 households, and 2,970 families living in the county. The population density was 2.6 inhabitants per square mile (1.0/km2). There were 4,695 housing units at an average density of 0.9 per square mile (0.35/km2). The racial makeup of the county was 64.3% American Indian, 31.4% white, 0.5% Asian, 0.2% black or African American, 1.0% from other races, and 2.6% from two or more races. Those of Hispanic or Latino origin made up 4.0% of the population. In terms of ancestry, 12.1% were American, and 10.3% were German.

Of the 4,004 households, 45.6% had children under the age of 18 living with them, 48.8% were married couples living together, 17.3% had a female householder with no husband present, 25.8% were non-families, and 23.0% of all households were made up of individuals. The average household size was 3.18 and the average family size was 3.77. The median age was 30.5 years.

The median income for a household in the county was $36,550 and the median income for a family was $41,985. Males had a median income of $32,216 versus $27,917 for females. The per capita income for the county was $15,066. About 20.7% of families and 23.5% of the population were below the poverty line, including 32.4% of those under age 18 and 15.4% of those age 65 or over.




Census-designated places

Unincorporated communities


Coal mining and agriculture play major roles in Big Horn County's economy. Farms and ranches in the county produce mainly beef cattle, sugar beets, alfalfa, and small grains.

See also

Kids robot.svg In Spanish: Condado de Big Horn (Montana) para niños

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