Before (end of 1982) (33 seats, Elections Centre)
Labour 27 · Plaid Cymru - The Party of Wales 3 · Other 3 · SDP-Liberal Alliance 0 · Conservative 0
After (end of 1983) (33 seats, Elections Centre)
Labour 32 · Other 1 · SDP-Liberal Alliance 0 · Conservative 0 · Plaid Cymru - The Party of Wales 0
Ward results
Dowlais4 seats
| W. Rogers | Labour | 1,592 |
| R. Thomas | Labour | 1,434 |
| D. Lewis | Labour | 1,319 |
| M. Sullivan | Labour | 1,277 |
| W. Healy | Independent | 727 |
| F. Snead | RATE | 672 |
| T. Davies | Plaid Cymru - The Party of Wales | 629 |
Merthyr Vale2 seats
| P. Davies | Labour | 1,457 |
| D. Toley | Labour | 1,102 |
| E. Bartlett | Plaid Cymru - The Party of Wales | 904 |
Park3 seats
| G Williams | Labour | 706 ✓ |
| J Jones | Labour | 620 ✓ |
| R Randay | Labour | 610 ✓ |
| G Foster | Plaid Cymru - The Party of Wales | 566 |
| L Edwards | Plaid Cymru - The Party of Wales | 539 |
Penydarren3 seats
| W. Morgan | Labour | 1,214 |
| P. Saunders | Labour | 1,060 |
| D. James | RATE | 1,014 |
| M. Keane | Labour | 954 |
| A. Jones | COMM | 543 |
| R. Edwards | All | 381 |
| G. Cooper | All | 346 |
Plymouth Ward3 seats · turnout 42.4%
| D. Games | Labour | 1,478 |
| J. Handley | Labour | 1,214 |
| M. Tasker | Labour | 1,067 |
| C. Foley | Plaid Cymru - The Party of Wales | 730 |
| G. Owens | Plaid Cymru - The Party of Wales | 634 |
Treharris3 seats
| M Shankland | Labour | 0 |
| M. Morgan | Labour | 0 ✓ |
| M. Shankland | Labour | 0 ✓ |
| M Morgan | Labour | 0 |
| G. Evans | Labour | 0 |
| G. Evans | Labour | 0 ✓ |
Vaynor2 seats
| C. Rogers | Labour | 807 ✓ |
| A. Jenkins | Labour | 628 ✓ |
| P. Enoch | Plaid Cymru - The Party of Wales | 470 |
