As of the 2000 United States Census, there were 9,667 people, 3,878 households, and 2,652 families in the county. The population density was 5 people per square mile. There were 4,557 housing units at an average density of 2 per square mile. The racial makeup of the county was 96.57% White, 0.09% Black or African American, 1.46% Native American, 0.18% Asian, 0.01% Pacific Islander, 0.85% from other races, and 0.85% from two or more races. 2.16% of the population were Hispanic or Latino of any race. 32.3% were of German, 22.4% Norwegian, 7.2% Irish, 6.2% English and 5.4% American ancestry. There were 3,878 households out of which 33.60% had children under the age of 18 living with them, 57.30% were married couplesliving together, 7.40% had a female householder with no husband present, and 31.60% were non-families. 28.80% of all households were made up of individuals and 12.90% had someone living alone who was 65 years of age or older. The average household size was 2.46 and the average family size was 3.04. The county population contained 27.50% under the age of 18, 6.40% from 18 to 24, 26.80% from 25 to 44, 23.80% from 45 to 64, and 15.60% who were 65 years of age or older. The median age was 39 years. For every 100 females there were 98.70 males. For every 100 females age 18 and over, there were 94.90 males. The median income for a household in the county was $32,110, and the median income for a family was $39,348. Males had a median income of $29,069 versus $19,203 for females. The per capita income for the county was $16,006. About 8.10% of families and 12.20% of the population were below the poverty line, including 13.90% of those under age 18 and 9.00% of those age 65 or over.
2010 census
As of the 2010 United States Census, there were 9,746 people, 4,167 households, and 2,698 families in the county. The population density was. There were 4,550 housing units at an average density of. The racial makeup of the county was 95.0% white, 1.7% American Indian, 0.2% Asian, 0.1% black or African American, 0.8% from other races, and 2.1% from two or more races. Those of Hispanic or Latino origin made up 3.0% of the population. In terms of ancestry, 37.8% were German, 23.1% were Norwegian, 13.0% were Irish, 8.7% were American, and 6.5% were English. Of the 4,167 households, 28.9% had children under the age of 18 living with them, 51.9% were married couples living together, 7.6% had a female householder with no husband present, 35.3% were non-families, and 29.8% of all households were made up of individuals. The average household size was 2.33 and the average family size was 2.88. The median age was 41.3 years. The median income for a household in the county was $52,516 and the median income for a family was $60,236. Males had a median income of $44,788 versus $23,135 for females. The per capita income for the county was $26,888. About 10.2% of families and 13.5% of the population were below the poverty line, including 16.6% of those under age 18 and 14.4% of those age 65 or over.
