- 1748-18091
- A. E. Dick Howard papers, 1928/20171
- A. Willis Robertson Papers, 1921/1988, bulk 1946/19661
- Abraham Davenport Ledger, 1804/18331
- Adams Papers, 1782/18901
- Administration records collection, 1776/19762
- Advisory Committee Research Collection, 1772/20175
- Albert Gallatin Letter to Benjamin Harrison, 18091
- Alderman family papers, 1779/19612
- Alexander Balmaine Memorandum Book, 1775/18201
- Alexander Campbell to Hannah Acheson Typescript Letter, 18091
- Alexandria History Collection (MS240), 1767/20086
- Alexandria Library Company Records (MS002), 1794/20075
- Alice Rice Jaffe Papers, 1807/1950, bulk 1919/19501
- Allen Family Papers, 1766/19336