- 17th and 18th century British periodicals, 1600/18001
- A. Little Letter, 17761
- A.J. Morrison Collection, 1754/19751
- Administration records collection, 1776/19761
- Alexander Balmaine Memorandum Book, 1775/18201
- Alexander Brown Papers (II), 1748/19001
- Alexander Haight family collection, 1764/19761
- Alexander Haight family collection, 1764/19771
- Alexander, Fultz, and Willson Families Collection, 1770/19701
- Alexandria History Collection (MS240), 1767/20081
- Alexandria, Virginia City Records (MS019), 1750/1983, bulk 1825/18751
- Allen Family Papers, 1766/19331
- Ancella Bickley, Historian, Research Papers regarding African-Americans, 1775/2018, bulk 1970/20111
- Anderson Family papers, 1755/19581
- Andrew Lindamood papers, 1768/18171