As of the census² of 2000, there were 58,463 people, 20,183 households, and 14,572 families residing in the county. The population density was 36/km² (94/mi²). There were 25,331 housing units at an average density of 16/km² (41/mi²). The racial makeup of the county was 29.51% White, 0.30% Black or African American, 0.36% Native American, 35.99% Asian, 9.12% Pacific Islander, 0.86% from other races, and 23.84% from two or more races. 8.22% of the population were Hispanic or Latino of any race.

There were 20,183 households out of which 34.00% had children under the age of 18 living with them, 53.90% were married couples living together, 12.80% had a female householder with no husband present, and 27.80% were non-families. 21.40% of all households were made up of individuals and 7.70% had someone living alone who was 65 years of age or older. The average household size was 2.87 and the average family size was 3.34.