- 1 Lettering
- 14 Letterpress printing
- 96 Letters (correspondence)
- 2 Letters of advice
- 1 Level (tools)
- 6 Lever Brothers Ltd.
- 1 Lever, Charles James, 1806-1872
- 1 Levering Academy
- 5 Leverington Avenue
- 1 Leverington Cemetery
- 4 Leverington Hotel
- 1 Levis' Mill
- 1 Lewis & Clark Exposition
- 2 Lewis' Cotton Factory
- 1 Lewis, Edmund Darch, 1835-1910
- 1 Lewis, John L. (John Llewellyn), 1880-1969
- 1 Lewis, Morgan (1754-1844)
- 1 Lewis, William David, 1792-1881
- 2 Lewisburg, Pennsylvania
- 1 LGBT
- 3 Liars
- 3 Libel & slander
- 2 Liberia
- 2 Liberty
- 4 Liberty (Allegorical figure)
- 2 Liberty cap
- 1 Liberty Council Hall
- 1 Liberty Moving Picture Show
- 2 Liberty Stove Works
- 1 Liberty Stove Works Building
- 1 liberty Theatre (Torresdale south of Longshore)
- 5 Libra symbols
- 14 Librarians
- 98 Libraries
- 10 Libraries (institutions)
- 311 Libraries (Rooms & spaces)
- 1 Library bookcases
- 16 Library cards
- 19 Library Company of Philadelphia
- 6 Library fittings and supplies
