As of the census of 2010, there were 181,440 people, 67,499 households, and 43,536 families residing in the county.  The population density was 158 people per square mile (61/km²). There were 77,656 housing units at an average density of 69 per square mile (27/km²). The racial makeup of the county, as of 2008, was 83.2% Race (United States Census), 6.50% Race (United States Census) or Race (United States Census), 0.3% Race (United States Census), 1.7% Race (United States Census), 0.03% Race (United States Census), 2.15% from Race (United States Census), and 1.70% from two or more races.  7.6% of the population were Race (United States Census) or Race (United States Census) of any race. 19.2% were of Italian people, 16.8% Irish people, 15.5% Germans, 6.8% English people, and 4.7% United States ancestry according to Census 2000. 90.3% spoke English language, 4.5% Spanish language, 1.2% Italian language, and 1.0% German language as their first language.. How many more housing units were there than households?