As of the census of 2010, there were 7,708 people, 2,380 households, and 907 families residing in the city. The population density was . There were 2,516 housing units at an average density of . The racial makeup of the city was 85.2% White (U.S. Census), 1.0% African American (U.S. Census), 0.4% Native American (U.S. Census), 11.2% Asian (U.S. Census), 0.1% Race (U.S. Census), 0.4% from Race (U.S. Census), and 1.8% from two or more races. Hispanic (U.S. Census) or Latino (U.S. Census) of any race were 1.8% of the population.. How many more housing units then households were there according to the census of 2010?