 According to the 2009 American Community Survey, the 2009 median household income in Prince William County was $89,785.The per capita income for the county was $35,890.The 2009 American Community Survey reported that in 2009, 6.0% of Prince William County's population was living below the poverty line, including 7.7% of those under age 18 and 5.3% of those age 65 or over.