Two naval cannons stand on either side of the Marr monument, pointed toward the National Bank of Fairfax, formerly the site of the brick tavern. Facing the bank, the cannon on the left is inscribed with an anchor and the following lettering: 12 PDR Boat Howitzer 1856 J.A.D. U.S.N.Y. Washington 757 LBS. 58 PRE No. 45. The cannon on the right has inscriptions which are very worn and indistinct. There is an engraved anchor, but except for a letter here-and-there, the inscription is unreadable.
Plaques and Portraits. Mounted in the inside north entrance hall beside the oldest portion of the courthouse are three plaques. One is a tablet with 160 names of Civil War veterans of Marr Camp, Confederate States of America. The second is a memorial to George Auld (1832–1919), born in Scotland, who "was for many years Chairman of the Board of Supervisors of Fairfax County, Virginia...." The third is a plaque commemorating the building of the first addition to the courthouse, A.D. 1929, W. I. Deming, Architect, and C. H. Brooks, Builder. In the central entrance hall, there is a bronze plaque commemorating the large addition to the courthouse completed in 1954, Robert A. Willgoos and Dwight G. Chase, Architects, and Eugene Simpson and Bro., Contractor. A large mural, painted by Esther L. Stewart in 1954, is hung above the landing of the grand central staircase. It depicts Fairfax County scenes, buildings, and portraits of Lord Fairfax, George Washington, and George Mason.
On the brick floor of the arcaded porch of the first (1800) section of the courthouse, is a National Register plaque (1974 listing) placed by the Fairfax County History Commission in 1976. In the hall inside hangs a plaque from the Virginia Historic Landmarks Commission commemorating the building's placement on the State Register in 1973.
Hanging on the walls of this oldest court chamber are oil portraits of county notables. (See [Appendix] for biographical listing.)