Song: "Mary Hartman, Mary Hartman"
Artist: Deadly Nightshade
Peak position on the Cashbox Singles chart: #65
Number of weeks on the Cashbox Singles chart: 9
Weekly data:
| Week ending | Rank | Title | Artist | Label |
|---|---|---|---|---|
| July 3, 1976 | 96 | Mary Hartman, Mary Hartman | Deadly Nightshade | Phantom 10709 |
| July 10, 1976 | 89 | Mary Hartman, Mary Hartman | Deadly Nightshade | Phantom 10709 |
| July 17, 1976 | 84 | Mary Hartman, Mary Hartman | Deadly Nightshade | Phantom 10709 |
| July 24, 1976 | 78 | Mary Hartman, Mary Hartman | Deadly Nightshade | Phantom 10709 |
| July 31, 1976 | 72 | Mary Hartman, Mary Hartman | Deadly Nightshade | Phantom 10709 |
| August 7, 1976 | 70 | Mary Hartman, Mary Hartman | Deadly Nightshade | Phantom 10709 |
| August 14, 1976 | 70 | Mary Hartman, Mary Hartman | Deadly Nightshade | Phantom 10709 |
| August 21, 1976 | 65 | Mary Hartman, Mary Hartman | Deadly Nightshade | Phantom 10709 |
| August 28, 1976 | 65 | Mary Hartman, Mary Hartman | Deadly Nightshade | Phantom 10709 |
Rankings greater than 100 are from the Cashbox 'Looking Ahead' charts.