As of the 2020 United States Census, Annandale has a population of approximately 43,363 residents. It is one of the most densely populated and diverse areas in Fairfax County.
The community is a melting pot of cultures. While demographics shift, roughly half of the population identifies as White, with a very strong Asian representation (often exceeding 20%, heavily anchored by the Korean-American community) and a significant Hispanic or Latino population (around 25-30%).
Annandale residents are generally highly educated, with a large percentage holding bachelor's or advanced degrees. Median household incomes are well above the national average, reflecting the high number of professionals employed in the federal government, technology sector, and professional services throughout the D.C. metropolitan area.