Song: "The Hardest Part"
Artist: Blondie
Peak position on the Cashbox Singles chart: #72
Number of weeks on the Cashbox Singles chart: 6
Weekly data:
| Week ending | Rank | Title | Artist | Label |
|---|---|---|---|---|
| January 26, 1980 | 86 | The Hardest Part | Blondie | Chrysalis 2408 |
| February 2, 1980 | 77 | The Hardest Part | Blondie | Chrysalis 2408 |
| February 9, 1980 | 74 | The Hardest Part | Blondie | Chrysalis 2408 |
| February 16, 1980 | 73 | The Hardest Part | Blondie | Chrysalis 2408 |
| February 23, 1980 | 72 | The Hardest Part | Blondie | Chrysalis 2408 |
| March 1, 1980 | 88 | The Hardest Part | Blondie | Chrysalis 2408 |
Rankings greater than 100 are from the Cashbox 'Looking Ahead' charts.