- Land Records of the MVLA, 1858/200631
- Lawrence Lewis family papers, 1785/1858273
- Lawrence Washington collection of Washington family papers, 1787/193257
- Licensing Department Files, 1984/2014408
- Lily Laughton Papers, 1850/1891257
- Maps of Mount Vernon and the surrounding areas, 1857/199299
- Martha Washington collection, 1761/1802107
- Measured Drawings and Blueprints of Mount Vernon, 1870/2016362
- Morley Jeffers Williams Collection, 1602/1967318
- Mount Vernon Black and White Film Collection, 1933/20056,661
- Mount Vernon Citizens' Association Collection, 1930/198215
- Mount Vernon Inn Complex Construction Project Files, 1995/200159
- Mount Vernon and MVLA Ephemera, 1858/202243
- Operation Overview Collection, 1953/198389
- Oral Histories of the Mount Vernon Ladies' Association, 1957/201538