The ruins of the Belvoir Mansion and the nearby Fairfax family grave site are listed on the National Register of Historic Places.

[4] As a result of the 2005 Base Realignment and Closure Commission, a substantial number of personnel were transferred to Fort Belvoir, and others were civilians employed there.

The 185,000-square-foot (17,200 m2) museum features historical galleries, an interactive "Experiential Learning Center" and the Army Theater.

While not named after a Confederate officer, it was renamed after a slave plantation that was once owned by prominent 18th century Loyalist land owner George William Fairfax.

Representative Howard W. Smith, who requested the 1930 renaming, was an old-school Southern Democrat who was sympathetic to the then-popular Dunning School of history that revered the Confederacy, and resented a base in Virginia being named after Andrew A. Humphreys, a Union Army general.

In June 2021, the fort was initially included in a list of military bases to be considered for renaming by a newly created Naming Commission.

[2] Later in March 2022, the Commission determined that Fort Belvoir did not meet the criteria provided in the 2021 National Defense Authorization Act for making a renaming recommendation.

Also located here are the 249th Engineer Battalion (Prime Power), the Military District of Washington's 12th Aviation Battalion which provides rotary-wing movement to the DoD and Congress, a Marine Corps detachment, a United States Air Force activity, United States Army Audit Agency, and an agency from the Department of the Treasury.

In addition, Fort Belvoir is home to National Reconnaissance Office's (NRO) Aerospace Data Facility-East (ADF-E).

Neighboring CDPs are Mount Vernon to the east, Woodlawn and Groveton to the northeast, Hayfield and Kingstowne to the north, and Franconia and Newington to the northwest.

At the 2020 census (some information from the 2022 American Community Survey) there were 7,637 people, 2,107 housing units and 1,810 households residing in the CDP.