- L. C. Angle, Jr., Collection, 1860/20014
- L. Henry Smith Family Papers, 1823/1878, bulk 1850/18741
- L. S. Rhodes & Sons Papers, 1886/19231
- L.J. Forman Papers, 1873/19341
- Ladwig Family Papers, 1870/19593
- Laine family papers, 1772/19613
- Lambert-Sheetz Family Papers, 1818/19073
- Land Grants, 1749/19851
- Land Papers Miscellaneous, 1803/19331
- Land Records of the MVLA, 1858/20062
- Land Surveys, 1815/19431
- Landon Family Papers, 1877/19269
- Lantz Family Papers, 1814/19218
- Larry Jones, Collector, Postcards, Photographs, and Other Material, 1785/1993, bulk 1897/19931
- Larry McBryde Collection on the John McLaren McBryde Family, 1859/20132