Former Owner
- Richard Rich1
- Richard Sackville1
- Riddagshausen Abbey1
- Robert Davies1
- Robert Elyot1
- Robert Fyncham1
- Robert H. Sayre1
- Robert Hoe III31
- Robert Rossiter Hutton1
- Ross Winans1
- Rudolph Frederick Kelker2
- Rugby School1
- Rush Hawkins1
- Rushton Mather Dorman1
- Ruth Cheney Streeter1
- Sabin1
- Samuel Allan1
- Samuel Claggett Chew2
- Samuel Dennis1
- Samuel Whitaker Pennypacker2