Top 10 Richest Counties in Us?

Many of the top 10 richest counties in the US are located in Washington, DC metro area and New York City metro area. These counties have average incomes ranging from $84,000 to $107,000, and include Santa Clara County, CA, Nassau County, NY, Douglas County, CO, Morris County, NJ, Montgomery County, MD and Loudon County, VA. For more information see here: