Song: "Don't Let Him Know"
Artist: Prism
Peak position on the Cashbox Singles chart: #40
Number of weeks on the Cashbox Singles chart: 11
Weekly data:
| Week ending | Rank | Title | Artist | Label |
|---|---|---|---|---|
| February 6, 1982 | 88 | Don't Let Him Know | Prism | Capitol 5082 |
| February 13, 1982 | 73 | Don't Let Him Know | Prism | Capitol 5082 |
| February 20, 1982 | 62 | Don't Let Him Know | Prism | Capitol 5082 |
| February 27, 1982 | 55 | Don't Let Him Know | Prism | Capitol 5082 |
| March 6, 1982 | 49 | Don't Let Him Know | Prism | Capitol 5082 |
| March 13, 1982 | 45 | Don't Let Him Know | Prism | Capitol 5082 |
| March 20, 1982 | 41 | Don't Let Him Know | Prism | Capitol 5082 |
| March 27, 1982 | 40 | Don't Let Him Know | Prism | Capitol 5082 |
| April 3, 1982 | 60 | Don't Let Him Know | Prism | Capitol 5082 |
| April 10, 1982 | 94 | Don't Let Him Know | Prism | Capitol 5082 |
| April 17, 1982 | 99 | Don't Let Him Know | Prism | Capitol 5082 |
Rankings greater than 100 are from the Cashbox 'Looking Ahead' charts.