Before (end of 1979) (35 seats, Elections Centre)
Conservative 19 · Other 10 · Labour 6 · The Liberal Party 0
After (end of 1980) (35 seats, Elections Centre)
Conservative 17 · Other 11 · Labour 7 · The Liberal Party 0
Ward results
Melcombe Regis1 seat · turnout 34.9%
| J. Nagel | Conservative | 780 |
| R. Cox | Labour | 342 |
North1 seat · turnout 38.2%
| W. Price | Conservative | 406 |
| P. Bennett | RES | 318 |
| E. Daker | Labour | 138 |
North Central1 seat · turnout 40.6%
| I. Sanderson | Conservative | 578 ✓ |
| C. Cousins | Labour | 421 |
| D. Saville | RES | 253 |
| M. Gibson | LIB | 92 |
Tophill West1 seat · turnout 25.9%
| E. Tucker | RES | 275 ✓ |
| P. Kimber | Labour | 208 |
| J. Martin | Conservative | 186 |
| R. Stone | Independent | 157 |
Westham East1 seat · turnout 38.2%
| M. Jewkes | Labour | 694 |
| M. Stuart-Brown | Conservative | 309 |
Westham North1 seat · turnout 41.2%
| D. Hall | Labour | 839 |
| C. Stone | RES | 545 |
| T. Shorter | Conservative | 303 |
Weymouth East1 seat · turnout 47.0%
| A. Griffin | Conservative | 564 |
| H. McGrath | Labour | 562 |
Weymouth West1 seat · turnout 39.7%
| R. Russell | Independent | 691 |
| H. Dawson | Labour | 470 |
| D. May | RES | 291 |
Wyke Regis1 seat · turnout 41.3%
| A Sheppard | Labour | 863 |
| H. Tufnail | RES | 686 |
