Song: "I Know A Heartache When I See One"
Artist: Jennifer Warnes
Peak position on the Cashbox Singles chart: #21
Number of weeks on the Cashbox Singles chart: 22
Weekly data:
| Week ending | Rank | Title | Artist | Label |
|---|---|---|---|---|
| July 7, 1979 | 97 | I Know A Heartache When I See One | Jennifer Warnes | Arista 0430 |
| July 14, 1979 | 93 | I Know A Heartache When I See One | Jennifer Warnes | Arista 0430 |
| July 21, 1979 | 91 | I Know A Heartache When I See One | Jennifer Warnes | Arista 0430 |
| July 28, 1979 | 89 | I Know A Heartache When I See One | Jennifer Warnes | Arista 0430 |
| August 4, 1979 | 87 | I Know A Heartache When I See One | Jennifer Warnes | Arista 0430 |
| August 11, 1979 | 83 | I Know A Heartache When I See One | Jennifer Warnes | Arista 0430 |
| August 18, 1979 | 75 | I Know A Heartache When I See One | Jennifer Warnes | Arista 0430 |
| August 25, 1979 | 67 | I Know A Heartache When I See One | Jennifer Warnes | Arista 0430 |
| September 1, 1979 | 61 | I Know A Heartache When I See One | Jennifer Warnes | Arista 0430 |
| September 8, 1979 | 54 | I Know A Heartache When I See One | Jennifer Warnes | Arista 0430 |
| September 15, 1979 | 47 | I Know A Heartache When I See One | Jennifer Warnes | Arista 0430 |
| September 22, 1979 | 42 | I Know A Heartache When I See One | Jennifer Warnes | Arista 0430 |
| September 29, 1979 | 35 | I Know A Heartache When I See One | Jennifer Warnes | Arista 0430 |
| October 6, 1979 | 32 | I Know A Heartache When I See One | Jennifer Warnes | Arista 0430 |
| October 13, 1979 | 29 | I Know A Heartache When I See One | Jennifer Warnes | Arista 0430 |
| October 20, 1979 | 23 | I Know A Heartache When I See One | Jennifer Warnes | Arista 0430 |
| October 27, 1979 | 21 | I Know A Heartache When I See One | Jennifer Warnes | Arista 0430 |
| November 3, 1979 | 21 | I Know A Heartache When I See One | Jennifer Warnes | Arista 0430 |
| November 10, 1979 | 32 | I Know A Heartache When I See One | Jennifer Warnes | Arista 0430 |
| November 17, 1979 | 51 | I Know A Heartache When I See One | Jennifer Warnes | Arista 0430 |
| November 24, 1979 | 70 | I Know A Heartache When I See One | Jennifer Warnes | Arista 0430 |
| December 1, 1979 | 100 | I Know A Heartache When I See One | Jennifer Warnes | Arista 0430 |
Rankings greater than 100 are from the Cashbox 'Looking Ahead' charts.