50. Darnestown, Maryland (Average Household Income: $262,988)

Add Darnestown to the list of wealthy towns situated near Washington, D.C. The town borders Travilah to the east, which is another wealthy town mentioned later in this list, and the Potomac River to the south.

The name Darnestown comes from William Darne, who was the largest landowner near the beginning of the 19th century. Today, wealthy residents still live in large homes on large lots, which is reflected in the high average income and low housing density.