According to the 2010 federal census, there were 39,702 people, 14,414 households, and 9,981 families residing in the county. The population density was 113 people per square mile (44/km²). There were 14,890 housing units at an average density of 45 per square mile (17/km²). The racial makeup of the county was 97% Race (United States Census), 1.2% Race (United States Census) or Race (United States Census), 0.1% Race (United States Census), 0.42% Race (United States Census), and 0.07% Race (United States Census). Two percent of the population were Race (United States Census) or Race (United States Census). US Veterans – 2,681. Median household income (in 2014 dollars), 2010–2014 was reported as $48,718, while the per capita income was $23,886. In 2014, the median household income in the USA was $53,700.. Which group is smaller for the county according to the census: people or families?