Former Owner
- John Ruskin2
- John Sotheby1
- John Thomas Beer1
- John Vyfyan1
- John William Bradley1
- Joseph Barrois12
- Joseph E. Widener7
- Joseph Pope1
- Joseph Whitney1
- Joseph-Félix Allard2
- Josephine Widener Wichfield2
- Julia Burgess7
- Julie de Busnel1
- Julien Peridier1
- Julius Heinrich Jeidels1
- Karen L. Gould10
- Keith Jarvis2
- Lane Theological Seminary1
- Lathrop Colgate Harper2
- Laurence Claiborne Witten II2