Former Owner
- James & Mary Lee Tregaskis (Firm)1
- James F. Drake1
- James Tregaskis1
- Johan C. Jackson1
- Johann Heinrich van Ess1
- John Anderson1
- John Bolton1
- John Dare1
- John Frederick Lewis10
- John Henry Ellis1
- John Hunt1
- John Read Dore1
- Joseph Barrois1
- Joseph E. Widener1
- Joseph Pope1
- Juana I of Castile1
- K. B. Starkie1
- Karen L. Gould2
- Lathrop Colgate Harper2
- Lawrence J. Schoenberg4