As of the 2010 census, there were 713,335 people, 268,325 households, and 182,282 families residing in the county. The population density was . There were 286,659 housing units at an average density of . The racial makeup of the county was 78.4% white, 8.9% Asian, 2.5% black or African American, 1.4% Indigenous, 0.4% Pacific islander, 3.8% from other races, and 4.6% from two or more races. Those of Hispanic or Latino origin made up 9.0% of the population. In terms of ancestry, 20.3% were German, 12.6% were Irish, 12.2% were English, 8.2% were Norwegian, and 3.6% were American.