- 3 Landseer, Sir Edwin Henry, 1802-1873
- 1 Lane, D.M. Carriage Factory
- 2 Lane, Edward William, 1801-1876
- 1 Lane, Richard James
- 1 Lane, Samuel Haycroft, 1804-1871
- 1 Lanfranco, Giovanni, 1582-1647
- 1 Langford, John Alfred, 1823-1903
- 1 Langham, The
- 6 Langhorne, Pennsylvania
- 1 Langres, France
- 1 Lang's Candy & Chocolate Factory
- 2 Lansdale, Pennsylvania
- 7 Lansdowne Avenue
- 2 Lansdowne Drive
- 1 Lansdowne Land Company
- 2 Lansdowne, Henry Petty-Fitzmaurice, Marquess of, 1780-1863
- 5 Lansdowne, Pennsylvania
- 1 Lanson Company
- 9 Lanterns
- 1 Laos
- 1 Lapland
- 1 Lapworh Bros.
- 1 Large Studies of Heads in Oriental Headdress (series)
- 5 Large's Dye Mill
- 1 Larned, Sylvester, Rev.
- 1 Larry, Henry Charles, 1793-1879
- 1 Larue, Louis Felix de, II
- 1 Las Cruces, New Mexico
- 3 Last days of Pompeii (Sculpture)
- 4 Latches Lane
- 1 Late D. Jonet & Co.
- 2 Lathes
- 2 Latimer Street
- 11 Latin (language)
- 1 Latino
- 1 Latrobe, Pennsylvania
- 1 Latta & Mulconroy (Firm)
- 1 Latvia
- 1 Lauber, Philip J.
- 1 Laundering
