As of the census of 2010, there were 727 people, 326 households, and 224 families in the county. The population density was 0.60/sqmi (0.23/km2). There were 436 housing units at an average density of 0.36/sqmi (0.14/km2). The racial makeup of the county was 97.5% white, 2.2% American Indian, 0.0% from other races, and 0.3% from two or more races. Those of Hispanic or Latino origin made up 1.7% of the population. In terms of ancestry, 53.9% were of German, 30.7% Norwegian, 9.9% English, 7.4% Swedish, 5.5% Polish and 2.8% American ancestry.
