- 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
- Andrew S. Core, Typescripts and Charts, 1804/18881
- Anita Cutright Burnett, Collector, Papers, 1790/19351
- Ann Smith Academy Papers, 1807/19101
- Anna Burton Ellett Collection, 1751/19322
- Anne Atkinson Chamberlayne Collection., 1742/19631