Potomac is a census-designated place (CDP) in Montgomery County, Maryland, United States, named after the nearby Potomac River. Potomac is the seventh most educated small town in America, based on percentage of residents with postsecondary degrees. Bloomberg Businessweek labeled Potomac as the twenty-ninth-richest ZIP Code in the United States in 2011, stating that it had the largest population of any U.S. town with a median income of more than $240,000. In 2012, The Higley Elite 100 published a list of highest-income neighborhoods by mean household income, which included four neighborhoods in Potomac; one of these neighborhoods, "Carderock-The Palisades" was ranked the highest-income neighborhood in the United States, followed by "Beverly Hills-North of Sunset" in Beverly Hills, Califo