Former Owner
- John Hinely1
- John Hinsdale Scheide5
- John Ives1
- John Lee1
- John Lumley, 1st Baron Lumley1
- John McRay1
- John Morley1
- John Reiner3
- John Stanley, 18th Earl of Derby1
- John Vyfyan1
- Joseph E. Widener1
- Josephine Widener Wichfield1
- Julia Burgess3
- Karen L. Gould2
- Kloster Rebdorf1
- Lane Theological Seminary1
- Lathrop C. Harper, Inc.1
- Laurence William Hodson2
- Lawrence J. Schoenberg3
- Leicester Harmsworth1