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is a census-designated place (CDP) in Fairfax County, Virginia, United States. The population was 54,994 at the 2000 census.
Annandale is located at (38.834134, -77.211277). Annandale is mostly traversed by the Capital Beltway and Virginia State Route 236. The center of town is considered to be where Route 236, Columbia Pike, and Backlick Road meet around two miles east of Interstate 495 on Route 236.
According to the United States Census Bureau, the CDP has a total area of 13.8 square miles (35.8 km²), of which, 13.8 square miles (35.7 km²) of it is land and 0.17% is water. The area is part of the coastal plain located just east of the Fall Line separating the coastal plain of Virginia from the piedmont. It is characterized by rolling hills, stream valleys, and heavy red clay soils.
The Annandale region is bisected by Accotink Creek, which in Colonial times was a primary link for ocean-going ships that would load tobacco and other goods where Little River Turnpike - Annandale's oldest road and the first toll road in America - crosses it. Accotink Creek was dammed in the 1960s to create Lake Accotink, a water supply for the U.S. Army's Fort Belvior Proving Ground located just downstream. Today, Lake Accotink is now a popular recreation area with fishing and boat rentals, and the Proving Ground is closed.
Also along Accotink Creek runs the Fairfax Cross County Trail (CCT) which provides uninterrupted hiking, biking, running and cross-country skiing for in Annandale. The CCT meanders through parks and forests filled with deer, fox, geese and numerous species of native birds. In the spring, Accotink Creek is stocked with trout and fishermen are often seen wading in its waters.