Passage: As of the census of 2000, there were 63,775 people, 25,205 households, and 17,290 families residing in the county.  The population density was 11 people per square mile (4/km²). There were 28,883 housing units at an average density of 5 per square mile (2/km²). The racial makeup of the county was 87.33% White, 0.63% Black or African American, 4.19% Native American, 0.80% Asian, 0.12% Pacific Islander, 3.45% from other races, and 3.47% from two or more races. 7.78% of the population were Hispanic or Latino of any race. 16.7% were of German, 10.8% Irish, 10.7% English and 9.8% United States or American ancestry. 92.6% spoke English and 6.1% Spanish as their first language.

Question: How many people were considered to be in a square mile?
11