Domestic Box Office For January 1980
| Rank | Release | Gross | Max Th | Opening | % of Total | Open Th | Open | Close | Distributor |
|---|---|---|---|---|---|---|---|---|---|
| 1 | How to Beat the High Cost of Living | $7,500,000 | - | - | - | - | Jan 1 | - | Filmways Pictures |
| 2 | Guyana: Cult of the Damned | $3,798,102 | 748 | $1,668,965 | 43.9% | 748 | Jan 25 | - | Universal Pictures |
| 3 | The Black Marble | $2,500,000 | - | - | - | - | Jan 1 | - | AVCO Embassy Pictures |
| 4 | Windows | $2,128,395 | 46 | $311,796 | 14.6% | 46 | Jan 18 | - | Metro-Goldwyn-Mayer (MGM) |
| 5 | Heart Beat | $954,046 | 18 | $74,303 | 7.8% | 18 | Jan 18 | - | Warner Bros. |
