- A. Rufus Tonelson Papers, 1922/19752
- A. Willis Robertson Papers, 1921/1988, bulk 1946/19665
- Adele Blow Chatfield-Taylor family papers, 1899/19772
- Adele Goodman Clark papers, 1849/19784
- Adolphus DeBussey, Soldier, Civil War Letters, 1861/1998, bulk 1861/18711
- Alan Clarke Railroad Research Papers, 1861/20124
- Albert J. Wasserman Papers, 1925/20031
- Albert L. Sturm Papers, 1904/19883
- Alberta Pfeiffer Architectural Collection, 1929/19762
- Alexander Haight family collection, 1764/19761
- Alexander Haight family collection, 1764/19773
- Alexandria Building and Repair Permits (MS080), 1930/19494
- Alexandria History Collection (MS240), 1767/200821
- Alexandria Library Board Records (MS416), 1937/20201
- Alexandria Library Company Records (MS002), 1794/20073