Annandale () is a census-designated place (CDP) in Fairfax County, Virginia. The population of the CDP was 41,008 as of the 2010 United States Census. It is home to the oldest and largest branch of the Northern Virginia Community College system, and to one of the D.C. area's Koreatowns.
Annandale derives its name from Annandale in Scotland.
Annandale is located at 38°50′3″N 77°12′41″W (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 (3 km) east of Interstate 495 on Route 236.
Annandale is bordered to the north by West Falls Church, to the east by Lake Barcroft and Lincolnia, to the south by North Springfield, and to the west by Wakefield and Woodburn. The CDP border follows Braddock Road to the south, Interstate 495 to the west, Holmes Run and U.S. Route 50 to the north, and Sleepy Hollow Road, Columbia Pike, and Little River Turnpike to the east.
According to the United States Census Bureau, the CDP has a total area of 7.86 square miles (20.4 km2), all of it land. 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.