Sheets of United States, 1998
| Issuer | Date | Desc | State | ||
| - | no image | United States | 2/3/1998 | empty sheet (#2876) | incomplete |
| X |  |
United States | 2/3/1998 | Celebrate the Century 1910s, sheet of 15 types | incomplete |
| X |  |
United States | 2/3/1998 | Celebrate the Century 1900s, sheet of 15 types | incomplete |
| - | no image | United States | 4/27/1998 | empty sheet (#2883) | incomplete |
| - |  |
United States | 4/27/1998 | empty sheet (#2884) | incomplete |
| - | no image | United States | 4/27/1998 | empty sheet (#2885) | incomplete |
| - | no image | United States | 4/27/1998 | empty sheet (#2886) | incomplete |
| X |  |
United States | 5/28/1998 | Celebrate the Century 1920s, sheet of 15 types | incomplete |
| X |  |
United States | 6/18/1998 | Trans-Mississippi stamps 100th, sheet of 8 types | incomplete |
| - |  |
United States | 6/18/1998 | Trans-Mississippi stamps 100th, empty sheet (#2887) | incomplete |
| - |  |
United States | 8/27/1998 | American Art, sheet of 20 types | |
| X |  |
United States | 9/10/1998 | Celebrate the Century 1930s, sheet of 15 types | incomplete |
| - |  |
United States | 10/15/1998 | empty sheet (#2888) | incomplete |
| - |  |
United States | 10/15/1998 | empty sheet (#2889) | incomplete |
| - |  |
United States | 11/9/1998 | empty sheet (#2890) | incomplete |
| - |  |
United States | 11/9/1998 | empty sheet (#2891) | incomplete |
| - |  |
United States | 11/9/1998 | empty sheet (#2892) | incomplete |