- A. E. Dick Howard papers, 1928/20171
- A. Willis Robertson Papers, 1921/1988, bulk 1946/19661
- Abraham Davenport Ledger, 1804/18331
- Abraham Grove Account Book, 1815/18501
- Adam Empie Papers, 1811/2004, bulk 1811/18501
- Adams Papers, 1782/18901
- Administration records collection, 1776/19762
- Advisory Committee Research Collection, 1772/20175
- Alderman family papers, 1779/19613
- Alexander Balmaine Memorandum Book, 1775/18201
- Alexander Brown Papers (I), 1815/19102
- Alexandria History Collection (MS240), 1767/20086
- Alexandria Library Company Records (MS002), 1794/20073
- Allen Family Papers, 1766/19337
- Ambler Papers, 1806/18361