According to theUnited States Census Bureau, the county has a total area of 2,369 square miles (6,140 km2), of which 2,355 square miles (6,100 km2) is land and 15 square miles (39 km2) (0.6%) is water.[4] Three-fourths of the county's land area lies within theFort Peck Indian Reservation.
According to theKöppen Climate Classification system, Bredette has acold semi-arid climate, abbreviated "BSk" on climate maps. The hottest temperature recorded in Bredette was 108 °F (42.2 °C) on August 6, 1983, and July 24, 2007, while the coldest temperature recorded was −52 °F (−46.7 °C) on January 20, 1954.[5]
Climate data for Bredette, Montana, 1991–2020 normals, extremes 1950–present
As of the2020 census, the county had a population of 10,794. Of the residents, 30.9% were under the age of 18 and 13.8% were 65 years of age or older; the median age was 33.2 years. For every 100 females there were 99.5 males, and for every 100 females age 18 and over there were 96.5 males. 0.0% of residents lived in urban areas and 100.0% lived in rural areas.[12][13][14]
There were 3,610 households in the county, of which 40.2% had children under the age of 18 living with them and 30.4% had a female householder with no spouse or partner present. About 26.4% of all households were made up of individuals and 9.7% had someone living alone who was 65 years of age or older.[13]
There were 4,065 housing units, of which 11.2% were vacant. Among occupied housing units, 59.9% were owner-occupied and 40.1% were renter-occupied. The homeowner vacancy rate was 2.0% and the rental vacancy rate was 7.4%.[13]
As of the2010 census, there were 10,425 people, 3,553 households, and 2,548 families residing in the county. The population density was 4.4 inhabitants per square mile (1.7/km2). There were 4,063 housing units at an average density of 1.7 per square mile (0.66/km2). The racial makeup of the county was 60.4% American Indian, 35.8% white, 0.4% Asian, 0.1% black or African American, 0.2% from other races, and 3.0% from two or more races. Those of Hispanic or Latino origin made up 1.3% of the population. In terms of ancestry, 20.0% wereNorwegian, 16.3% wereGerman, 6.1% wereIrish, and 1.3% wereAmerican.
Of the 3,553 households, 42.4% had children under the age of 18 living with them, 42.9% were married couples living together, 20.5% had a female householder with no husband present, 28.3% were non-families, and 24.2% of all households were made up of individuals. The average household size was 2.88 and the average family size was 3.41. The median age was 31.6 years.
The median income for a household in the county was $37,451 and the median income for a family was $50,146. Males had a median income of $39,008 versus $34,725 for females. The per capita income for the county was $17,821. About 15.8% of families and 21.5% of the population were below thepoverty line, including 28.6% of those under age 18 and 10.9% of those age 65 or over.
Roosevelt County is competitive in presidential elections, due to its high Native American population. After a seven-election streak of voting for theDemocratic candidate, it voted forRepublicanDonald Trump by narrow margins in2016 and2020. In 2024, the county trended more strongly in theconservative direction when it gave Trump a 53% majority.
United States presidential election results for Roosevelt County, Montana[15]