| Owner | Count | 1.
| Horton Plaza, San Diego, California | 1 | 2.
| Horton Plaza Shopping Center, San Diego, California | 1 | 3.
| Horton, Raymond Keith, Mr. Topeka, Kansas | 1 | 4.
| Horton, W. G., | 1 | 5.
| Horton, W. Gray, | 6 | 6.
| Hortulus Farm Foundation Museum, | 3 | 7.
| Horwich, Leonard J., Mr. & Mrs., | 1 | 8.
| Horwich, Leonard J., Mr. & Mrs., Chicago, Illinois | 2 | 9.
| Hoser, Ken, | 1 | 10.
| Hoshall, Edward M., Mrs, | 1 |
|