Before (end of 1978) (39 seats, Elections Centre)
Conservative 20 · Labour 13 · Other 6 · The Liberal Party 0
After (end of 1979) (35 seats, Elections Centre)
Conservative 19 · Other 10 · Labour 6 · The Liberal Party 0
Ward results
Melcombe Regis3 seats · turnout 64.3%
| J. Blackburn | Conservative | 1,452 |
| J. Blackburn | Conservative | 1,452 ✓ |
| L. Hill | Conservative | 1,395 ✓ |
| L Hill | Conservative | 1,395 |
| J Nagel | Conservative | 1,389 |
| J. Nagel | Conservative | 1,389 ✓ |
| W. Fancy | Labour | 634 |
| W. Fancy | Labour | 634 |
| R Cox | Labour | 630 |
| R. Cox | Labour | 630 |
| R Hill | Labour | 577 |
| R. Hill | Labour | 577 |
North2 seats · turnout 61.7%
| J. Fry | Conservative | 1,080 |
| W. Price | Conservative | 1,038 |
| J. Painter | Labour | 557 |
North Central3 seats · turnout 87.5%
| J Jenner | Conservative | 1,214 |
| J. Jenner | Conservative | 1,214 ✓ |
| J Gardner | Conservative | 1,182 |
| J. Gardner | Conservative | 1,182 ✓ |
| I. Sanderson | Conservative | 1,145 ✓ |
| Isobel Sanderson | Conservative | 1,145 |
| E. Daker | Labour | 791 |
| E Daker | Labour | 791 |
| E Greening | RES | 662 |
| E. Greening | Residents | 662 |
| T Lloyd | Labour | 655 |
| T. Lloyd | Labour | 655 |
| J Miller | Labour | 630 |
| J. Miller | Labour | 630 |
Preston3 seats · turnout 63.9%
| J. Litschi | Conservative | 1,690 |
| K. Nicklen | Conservative | 1,521 |
| J. Stewart | Conservative | 1,430 |
| A. Pulley | RES | 1,362 |
| R. Clayton | Labour | 460 |
Tophill East2 seats · turnout 71.5%
| J. Neimer | RES | 974 |
| H. Booth | Independent | 953 |
| C. Evans | Conservative | 555 |
| F. Morris | Labour | 538 |
| G. White | Labour | 246 |
Tophill West3 seats · turnout 55.3%
| L. Ames | RES | 1,474 |
| N. Brown | Independent | 1,061 |
| J. Martin | Conservative | 855 |
| W. Perry | Conservative | 748 |
| J. Bishop | Labour | 654 |
| D. Wellman | Labour | 499 |
Underhill2 seats · turnout 66.9%
| A. Martindale | Labour | 872 |
| P. Harvet | Conservative | 745 |
| K. Saunders | Labour | 652 |
| E. Tucker | RES | 642 |
| R. Burley | Conservative | 400 |
Westham East2 seats · turnout 69.2%
| C. Price | Labour | 1,102 |
| M. Jewkes | Labour | 1,068 |
| O. Carroll | Conservative | 745 |
| R. Armstrong | Conservative | 739 |
Westham North3 seats · turnout 66.3%
| S. Cheesley | RES | 1,512 |
| V. McCarthy | Labour | 1,330 |
| R. Russell | Conservative | 1,326 |
| D. Hall | Labour | 1,261 |
| H. McGrath | Labour | 1,216 |
| T. Shorter | Conservative | 1,195 |
Westham West2 seats · turnout 63.7%
| R. Gainey | Labour | 1,188 |
| G. Adam | RES | 1,171 |
| P. Rendall | Labour | 927 |
Weymouth East2 seats · turnout 75.3%
| E. Webb | Conservative | 1,214 |
| A. Griffin | Conservative | 1,185 |
| E. Black | Labour | 642 |
| R. Meades | Labour | 608 |
Weymouth West3 seats · turnout 67.7%
| T. Burge | Independent | 1,719 |
| R. Weaver | Conservative | 1,606 |
| H. Toft | RES | 1,484 |
| G. Stokes | Labour | 1,007 |
| R. Stokes | Labour | 907 |
| A. Williams | Labour | 796 |
Wyke Regis3 seats · turnout 60.8%
| M. Burt | RES | 1,692 |
| C. Taylor | RES | 1,631 |
| A Sheppard | Labour | 1,188 |
| B. Dench | Labour | 1,164 |
| B. Penn | Labour | 1,125 |
