Former Owner
- John Thomas Beer1
- John West, 1st Earl De La Warr1
- John Wright1
- Josephine Widener Wichfield1
- Katheline Minnis1
- Lambertus Eerens1
- Laurence Claiborne Witten II1
- Laurence Kirby1
- Laurent Campagne1
- Laurentius van der Torqel1
- Legoué1
- Lisa Norris Elkins1
- Lorenzo de Olivera1
- Louis César de La Baume Le Blanc1
- Louis H. Silver1
- Ludwig Rosenthal1
- Luigi Cora1
- Luigi Serra di Cassano1
- Luther Albertus Brewer1
- Lutheran Theological Seminary at Philadelphia1