Glen Allen is a census-designated place (CDP) in Henrico County, Virginia, United States. The population was 14,774 as of the 2010 census, up from 12,562 at the 2000 census. Areas outside the CDP which use a "Glen Allen" mailing address include residences in neighboring Hanover County.
Called "Mountain Road Crossing" when rail service began in 1836, the settlement which came to be known as Glen Allen took its name from the homestead of a local landowner, Mrs. Benjamin Allen. Its most noted resident was Captain John Cussons, a native Englishman, Confederate scout, author, and entrepreneur. Cussons made his residence here after the Civil War and founded a successful printing company. Later he built a fashionable resort hotel known as Forest Lodge adjacent to the railroad tracks.
The area of Glen Allen used to be mostly rural farmland, but it is now a growing suburb of Richmond.
According to the United States Census Bureau, the CDP has a total area of 8.86 square miles (22.94 km2), of which 8.79 square miles (22.77 km2) are land and 0.069 square miles (0.18 km2), or 0.76%, are water.
The Glen Allen census-designated place is in northern Henrico County, approximately 11 miles (18 km) north-northwest of downtown Richmond. The CDP is bordered to the north by the Chickahominy River, which forms the Henrico–Hanover County line.