- Alexander Haight family collection, 1764/19773
- Alexander Hamilton, Jr. Letters, 1832/18331
- Alexander McNutt Glasgow Family Papers, 1823/19032
- Alexander, Fultz, and Willson Families Collection, 1770/19701
- Alexandria Black Family Reunion Digital Collection, 1937/20051
- Alexandria Gazette Ledgers (MS026), 1833/18666
- Alexandria History Collection (MS240), 1767/200818
- Alexandria Library Company Records (MS002), 1794/20079
- Alexandria Scrapbook Collection (MS003), 1830/18932
- Alexandria, Virginia City Records (MS019), 1750/1983, bulk 1825/18751
- Alfred Beckley (1802-1888) Papers, 1832/18561
- Alfred Leyburn Papers, 1823/1899, bulk 1830/18392
- Alice Rice Jaffe Papers, 1807/1950, bulk 1919/19501
- Allen Family Papers, 1766/193320
- Alpheus Garrison Civil War Records, 1804/18881