- Alderman family papers, 1779/19616
- Alexander Brown Papers (I), 1815/19105
- Alexander Brown Papers (II), 1748/19004
- Alexander Farish Robertson Papers, 1867/19319
- Alexander Haight family collection, 1764/197610
- Alexander Haight family collection, 1764/197712
- Alexander Hamilton, Jr. Letters, 1832/18331
- Alexander McNutt Glasgow Family Papers, 1823/19036
- Alexander Sterrett Paxton Papers, 1858/1959, bulk 1861/18651
- Alexandria History Collection (MS240), 1767/200813
- Alexandria Library Company Records (MS002), 1794/20071
- Alexandria Office of Sheriff Jail Records (MS054), 1891/19481
- Alleghany Chapter, National Society of the Daughters of the American Revolution Records, 1890/20222
- Allen Family Papers, 1766/193322
- Allen-Johnson Family Papers, 1838/19471