Brambleton is a census-designated place in Loudoun County, Virginia, United States, south of the Dulles Greenway. The population as of the 2010 United States Census was 9,845. In 2017, Brambleton had an estimated population of 19,900, with a median age of 34.3 and a median household income of $173,690. Between 2016 and 2017 the population of Brambleton, VA grew from 17,063 to 19,876, a 16.5% increase and its median household income grew from $164,321 to $173,690, a 5.7% increase.