In 1912 Blaine, Phillips and Hill counties were formed from the area of Chouteau County. The original boundary of Blaine County included a portion of land in the west that is now included in Phillips County.
Geography
According to the United States Census Bureau, the county has a total area of 4,239 square miles (10,980 km2), of which 4,228 square miles (10,950 km2) is land and 11 square miles (28 km2) (0.3%) is water.[3]
U.S. Decennial Census[6] 1790–1960,[7] 1900–1990,[8] 1990–2000,[9] 2010–2020[1]
2020 census
As of the 2020 census, there were 7,044 people living in the county.
2010 census
As of the 2010 census, there were 6,491 people, 2,357 households, and 1,604 families living in the county. The population density was 1.5 inhabitants per square mile (0.58 inhabitants/km2). There were 2,843 housing units at an average density of 0.7 units per square mile (0.27 units/km2). The racial makeup of the county was 49.4% American Indian, 48.2% white, 0.1% black or African American, 0.1% Asian, 0.2% from other races, and 2.0% from two or more races. Those of Hispanic or Latino origin made up 1.8% of the population. In terms of ancestry, 23.0% were German, 9.2% were Norwegian, 6.6% were Irish, 5.7% were English, and 2.0% were American.
Of the 2,357 households, 39.2% had children under the age of 18 living with them, 45.6% were married couples living together, 16.0% had a female householder with no husband present, 31.9% were non-families, and 28.7% of all households were made up of individuals. The average household size was 2.66 and the average family size was 3.28. The median age was 35.1 years.
The median income for a household in the county was $37,034 and the median income for a family was $40,890. Males had a median income of $32,320 versus $28,986 for females. The per capita income for the county was $16,813. About 23.6% of families and 29.0% of the population were below the poverty line, including 44.6% of those under age 18 and 10.6% of those age 65 or over.
Politics
Blaine County is the nation's most consistent long-term bellwether county, having voted for the winning presidential candidate in all but two elections held in its history. After backing Theodore Roosevelt against Woodrow Wilson in the county's inaugural 1912 election, Blaine County has been won by the winner of the presidential election in every election except that of 1988, held during the aftermath of a major drought and farm crisis; Michael Dukakis won the county by 58 votes. During two other drought years on the Great Plains, Adlai Stevenson II in 1956 and Gerald Ford in 1976 also came close to breaking the county's streak, losing by even smaller vote margins than George H. W. Bush.
United States presidential election results for Blaine County, Montana[10]
