As of the census of 2000, there were 563,598 people, 181,629 households, and 134,768 families residing in the county. The population density was 403 people per square mile (156/km2). There were 189,160 housing units at an average density of 135 per square mile (52/km2). The racial makeup of the county was 58.1% White, 6.7% Black or African American, 1.1% Native American, 11.4% Asian, 0.4% Pacific Islander, 16.3% from other races, and 6.1% from two or more races. 30.5% of the population were Hispanic or Latino of any race. 9.3% were of German, 5.3% Irish and 5.0% English ancestry according to Census 2000. 66.4% spoke English, 21.3% Spanish, 2.2% Tagalog, 1.8% Mon-Khmer or Cambodian, 1.1% Vietnamese and 1.1% Hmong as their first language.