Read this article and answer this question As of the census of 2010, there were 516,564 people, 140,602 households, and 114,350 families residing in the county. The population density was 259 people per square mile (100/km²).  There were 148,350 housing units, at an average density of 74 per square mile (29/km²). The countys racial makeup was 89.4% Race (United States Census), 0.5% Black or African American, 0.6% American Indian or Alaska Native, 1.4% Asian, 0.8% Native Hawaiian or other Pacific Islander, 4.6% some other race, and 2.7% from two or more races. 10.8% of the population were Hispanic or Latino of any race.
How many more housing units are there than households?
7748