- "Out of the Attic" Collection, 1979-19932
- African American Architectural Surveys In Loudoun County, VA
20042
- Aldie Horticultural Society Records, 1923-20133
- Aldie Ruritan Records
1972-2001
1973-19995
- Alexander McIntyre/William Moore Land Indenture, 18401
- Alexandria, Loudoun & Hampshire Railroad Account Book, Guilford, VA
1860-1868
1866-18681
- American Association of University Women, Loudoun Branch Records
1973-19982
- American Legion of Honor, Loudoun Council No. 341 Records
1880-18971
- American Revolution Bicentennial Poster Collection, 1974-1977, n.d.1
- Andrew Monroe Cridler Papers, 1871-1913, n.d.2
- Ann Thomas Research Papers
1836-20053
- Anna Snowden Wildman Dyer Collection
1849-19733
- Arnold Account Books
1930-19371
- Asa Jackson Collection
1860-18661
- Ashburn: Then and Now
1877 to 20031