Five out of the ten richest counties in the United States are located in the suburbs of Washington D.C., within Maryland and Virginia. These counties boast a median income of approximately $134,000. Furthermore, when considering Washington D.C. alongside the fifty states, it holds the highest proportion of individuals with a college degree. Moreover, D.C. is a hub for a vast array of federal government and agency roles, inclusive of contractors. The jobs generally tend to pay well.