Arlington County was listed as the fifth richest county in American according to Main Street’s post published this week. The median household income is $96,218 and 47% of employed residents make over six figures a year. 2009 Census data from the American Community Survey was used to rank the top 10 richest counties in America according to median household income. Seven of the top ten are in the Washington-Baltimore Metropolitan area, including the top place, Loudoun County.
