As of the census of 2010, there were 10,355 people, 4,280 households, and 2,625 families residing in the city. The population density was . There were 4,927 housing units at an average density of . The racial makeup of the city was 95.6% White (U.S. Census), 0.5% African American (U.S. Census), 0.6% Native American (U.S. Census), 1.0% Asian (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.
Question: How many more housing units are there than households?
Answer: 647