- Alexandria Library Company Records (MS002), 1794/20079
- Alexandria, Virginia City Records (MS019), 1750/1983, bulk 1825/18751
- Alice Rice Jaffe Papers, 1807/1950, bulk 1919/19504
- Allen Family Papers, 1766/19339
- Alpheus Garrison Civil War Records, 1804/18881
- Ambler Papers, 1806/18362
- Amos Johnson Ledgers, 1808/1861, bulk 1808/18211
- Amos Koontz Papers I, 1809/1965, bulk 1936/19651
- Ancella Bickley, Historian, Research Papers regarding African-Americans, 1775/2018, bulk 1970/20119
- Anderson Family papers, 1755/195810
- Andrew Delmar Hopkins Papers, 1787/19431
- Andrew Kincannon Ledger, 1808/18371
- Andrew Lindamood papers, 1768/18172
- Andrew Reid Account Book, 1787/18372
- Andrew Reid record book photocopy, 1803/18282