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is a census-designated place (CDP) in Henrico and Hanover Counties, Virginia, United States. The population was 12,562 at the 2000 census.
According to the United States Census Bureau, the CDP has a total area of 8.9 square miles (22.9 km²), of which, 8.9 square miles (22.9 km²) of it is land and 0.11% is water.
Glen Allen is located north of the city of Richmond. As Richmond has expanded, Glen Allen has become a suburb of Richmond. A large area of northern and western Henrico County, from the Goochland County line north of Broad Street to the neighborhoods surrounding the Virginia Center Commons mall off U.S. Route 1, has a Glen Allen postal address (ZIP codes 23059 and 23060). However, the actual Glen Allen CDP is a much smaller area, near the intersection of Woodman Road and Mountain Road.