Before (end of 1975)
Not known.
After (end of 1976)
Not known.
Ward results
Cymmer3 seats · turnout 31.0%
| E. Williams | Labour | 814 |
| E. Lewis | Labour | 792 |
| M. Goodridge | Independent | 610 |
| H. Hall | Labour | 594 |
Ferndale3 seats · turnout 51.6%
| G. James | Plaid Cymru - The Party of Wales | 2,966 |
| K. Rees | Labour | 2,000 |
| R. Morris | Independent | 1,792 |
| Linda Jones-Bulman | Labour | 1,774 |
| J. Evans | Labour | 1,498 |
| H. Matthews | COMM | 1,384 |
Llwynpia3 seats · turnout 38.5%
| L. Brown | Labour | 1,728 |
| T. Jones | Labour | 1,597 |
| R. Ashman | Labour | 1,531 |
| D. Morgan | Plaid Cymru - The Party of Wales | 1,515 |
Pentre3 seats · turnout 31.6%
| A. Davies | Labour | 1,173 |
| B. McGrath | Labour | 1,034 |
| R. Betteny | Independent | 1,031 |
| D Lewis | Labour | 986 |
Penygraig3 seats · turnout 31.8%
| A. Powell | COMM | 1,647 |
| D. Jones | Labour | 1,338 |
| R. Newman | Labour | 1,140 |
| A. Leach | Labour | 1,139 |
Porth3 seats · turnout 40.7%
| T. Matthews | RATE | 2,168 |
| R. Dentus | RATE | 1,790 |
| T. Rees | RATE | 1,788 |
| G. Doel | Labour | 1,450 |
| D. Williams | Labour | 1,393 |
| G. Lloyd | Labour | 1,384 |
Trealaw3 seats · turnout 34.8%
| P. Leyshon | Conservative | 1,648 |
| E. Hopkins | Labour | 1,572 |
| D. Murphy | Labour | 1,551 |
| E. Groves | Labour | 1,401 |
Treherbert3 seats
| G. Rees | Labour | 2,115 |
| E. Evas | Labour | 1,861 |
| D. Davies | Labour | 1,662 |
| G. True | COMM | 1,454 |
Treorchy3 seats · turnout 40.0%
| A. Boxall | Labour | 2,039 |
| E. Salathiel | Labour | 2,005 |
| T. Davies | Labour | 1,962 |
| H. Davies | Plaid Cymru - The Party of Wales | 1,798 |
Tylerstown3 seats · turnout 35.7%
| M. Chard | RATE | 1,479 |
| M. Collins | Labour | 1,376 |
| A. Lewis | Plaid Cymru - The Party of Wales | 1,246 |
| D Morgan | Labour | 1,123 |
| D. Mitchell | Labour | 981 |
Ynyshir3 seats · turnout 38.8%
| G. May | RATE | 1,826 |
| E. Evans | Labour | 1,242 |
| H. Hicks | Labour | 1,157 |
| R. Mitchell | Labour | 1,067 |