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 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[12]