Before (end of 1990)
Not known.
After (end of 1991)
Not known.
Ward results
Mountain Ash East2 seats · turnout 50.6%
| Pauline Jarman | PC | 1,010 |
| G. Roberts | PC | 845 |
| M. Extence | Labour | 437 |
Mountain Ash West3 seats · turnout 37.0%
| C. Benney | PC | 1,016 |
| J. Lopac | PC | 920 |
| D. Pritchard | Labour | 713 |
| T. Beynon | Labour | 706 |
| R. Grant | Labour | 641 |
Pen-Y-Waun2 seats
| D. Jenkins | Labour | 0 |
| D. Barnsley | Labour | 0 |