According to theUnited States Census Bureau, the county has a total area of 5,062 square miles (13,110 km2), of which 4,926 square miles (12,760 km2) is land and 136 square miles (350 km2) (2.7%) is water.[4] It is Montana's fourth-largest county by total area.
Agriculture is the major economic activity of Valley County. The US Air Force operatedGlasgow Air Force Base at St. Marie until 1976, which was a strong influence on the local economy until its closure.
As of the2010 census, there were 7,369 people, 3,198 households, and 1,997 families living in the county. The population density was 1.5 inhabitants per square mile (0.58/km2). There were 4,879 housing units at an average density of 1.0 units per square mile (0.39/km2). The racial makeup of the county was 87.0% white, 9.8% American Indian, 0.5% Asian, 0.2% black or African American, 0.3% from other races, and 2.1% from two or more races. Those of Hispanic or Latino origin made up 1.2% of the population. In terms of ancestry, 33.4% wereGerman, 27.9% wereNorwegian, 12.4% wereIrish, 10.3% wereEnglish, and 6.8% wereAmerican.
Of the 3,198 households, 26.9% had children under the age of 18 living with them, 50.3% were married couples living together, 8.0% had a female householder with no husband present, 37.6% were non-families, and 33.4% of all households were made up of individuals. The average household size was 2.26 and the average family size was 2.88. The median age was 46.4 years.
The median income for a household in the county was $42,050 and the median income for a family was $54,096. Males had a median income of $40,802 versus $30,272 for females. The per capita income for the county was $24,305. About 5.7% of families and 10.1% of the population were below thepoverty line, including 17.0% of those under age 18 and 11.8% of those age 65 or over.
Valley County voters vote reliably Republican in national elections. Since 1964, they have selected the Democratic Party candidate only once (1992, due to strong showing by third-party candidateRoss Perot, which split the Republican voters).
United States presidential election results for Valley County, Montana[11]