| Owner | Count | 1.
| Rizer, Timothy Elliot, Lorton, Virginia | 1 | 2.
| Rizio, Richard E. & Luisa T., Washington, District of Columbia | 1 | 3.
| Rizzi, Mario, Dr., Zollikon, Switzerland | 1 | 4.
| Rizzoli, Mathew, San Francisco, California | 1 | 5.
| Rizzuti, Dr., | 1 | 6.
| Rizzuti, Dr., Brooklyn, New York | 2 | 7.
| RKO General Building, Boston, Massachusetts | 1 | 8.
| RKO General Building, Boston, Massachusetts | 1 | 9.
| Roab, William, Sarasota, Florida | 4 | 10.
| Roach, Arno L., Mrs (Ruth Robinson), Kansas City, Missouri | 1 |
|