| Cardiff vs | Mountain Ash | ||||
| Matches | 12 | ||||
| Won | 10 | ||||
| Lost | 1 | ||||
| Drawn | 1 | ||||
| Points For | 134 | ||||
| Points Against | 43 | ||||
| Date | Home | Away | Venue | ||
| 07/12/1912 | Mountain Ash | 0 | 14 | Cardiff | Unknown |
| 17/01/1914 | Cardiff | 12 | 6 | Mountain Ash | Cardiff Arms Park, Cardiff |
| 20/12/1919 | Mountain Ash | 3 | 6 | Cardiff | Unknown |
| 12/03/1921 | Cardiff | 17 | 3 | Mountain Ash | Cardiff Arms Park, Cardiff |
| 08/12/1921 | Mountain Ash | 6 | 7 | Cardiff | Unknown |
| 28/09/1925 | Mountain Ash | 3 | 8 | Cardiff | Unknown |
| 02/10/1926 | Cardiff | 15 | 7 | Mountain Ash | Cardiff Arms Park, Cardiff |
| 26/02/1927 | Mountain Ash | 0 | 0 | Cardiff | Unknown |
| 28/02/1931 | Mountain Ash | 0 | 9 | Cardiff | Unknown |
| 01/05/1933 | Mountain Ash | 7 | 0 | Cardiff | Unknown |
| 20/03/1939 | Mountain Ash | 8 | 24 | Cardiff | Unknown |
| 13/12/1972 | Cardiff | 22 | 0 | Mountain Ash | Cardiff Arms Park, Cardiff |
