Falls Church is an independent city in the Commonwealth of Virginia, United States. As of the 2020 census, the population was 14,658. Fal…Falls Church is an independent city in the Commonwealth of Virginia, United States. As of the 2020 census, the population was 14,658. Falls Church is part of both Northern Virginia and the Washington metropolitan area. As of 2020, it has a median household income of $146,922, the second-highest household income of any county in the nation behind Loudoun County, Virginia.