Before (end of 1998) (68 seats, Elections Centre)
Labour 56 · Plaid Cymru - The Party of Wales 9 · Other 3 · Conservative 0 · Liberal Democrats 0
After (end of 1999) (73 seats, Elections Centre)
Plaid Cymru - The Party of Wales 38 · Labour 28 · Other 4 · Liberal Democrats 3 · Conservative 0
Ward results
Aber Valley3 seats
| R Phillips | Labour | 927 ✓ |
| P Ford | Labour | 872 ✓ |
| Handel Davies | Plaid Cymru - The Party of Wales | 845 ✓ |
| B Barker | Labour | 801 |
| A. Drake | Plaid Cymru - The Party of Wales | 785 |
| J Gough | Liberal Democrats | 785 |
| T Richards | Socialist | 201 |
| S Hagin | Liberal Democrats | 151 |
Argoed1 seat · turnout 43.1%
| Mary Hughes | PC | 462 |
| L. Gardiner | Labour | 408 |
Bargoed3 seats · turnout 38.2%
| D. Davies | Labour | 1,010 |
| Gillian Jones | PC | 871 |
| K. Viney | PC | 870 |
| B. Jones | Labour | 799 |
| J. Evans | Labour | 765 |
| A. Nutt | PC | 687 |
| Carol Andrews | Liberal Democrats | 315 |
| G. Morgan | Independent | 228 |
Bedwas Trethomas & Machen4 seats · turnout 36.8%
| R. Davies | Labour | 1,765 |
| Elizabeth Aldworth | Labour | 1,563 |
| A. Donaldson | Independent | 1,537 |
| J. Davies | Labour | 1,528 |
| H. Morgan | Independent | 1,082 |
| W. Thomas | Labour | 1,018 |
| T. Davies | PC | 835 |
| Nadine Vincent | PC | 709 |
| G. Harris | PC | 674 |
| S. Steer | PC | 613 |
| W. Johns | Conservative | 363 |
Blackwood3 seats
| D Jones | Plaid Cymru - The Party of Wales | 1,594 ✓ |
| I Franklin | Plaid Cymru - The Party of Wales | 1,340 ✓ |
| K Etheridge | Liberal Democrats | 1,306 ✓ |
| L Thomas | Plaid Cymru - The Party of Wales | 1,178 |
| M Veater | Independent | 738 |
| A Leach | Labour | 697 |
| M Lewis | Labour | 672 |
| Mike Jones | Conservative | 292 |
Cross Keys1 seat · turnout 49.5%
| D. Gray | Labour | 714 |
| R. Southall | PC | 560 |
Crumlin2 seats · turnout 49.1%
| K. Lloyd | PC | 1,579 |
| M. Lloyd | PC | 1,379 |
| F. Perkins | Labour | 771 |
| G. Maddock | Labour | 732 |
Hengoed2 seats
| D Bolter | Plaid Cymru - The Party of Wales | 1,044 ✓ |
| Judith Pritchard | Plaid Cymru - The Party of Wales | 1,034 ✓ |
| D. Bassett | Labour | 575 |
| S. Franklin | Labour | 453 |
Llanbradach2 seats · turnout 43.3%
| R. Gough | PC | 1,555 |
| Mann C. | PC | 948 |
| Jo Rao | Labour | 531 |
Morgan Jones3 seats
| P. Bevan | Plaid Cymru - The Party of Wales | 1,337 ✓ |
| K. Gwynne | Plaid Cymru - The Party of Wales | 1,170 ✓ |
| M Newman | Plaid Cymru - The Party of Wales | 1,106 ✓ |
| Vic Hooper | Labour | 612 |
| R Williams | Labour | 551 |
| M Date | Liberal Democrats | 301 |
| J Child | Conservative | 254 |
Moriah2 seats · turnout 35.4%
| J. Bevan | Labour | 928 |
| S. Lewis | Labour | 898 |
| A. Shurmer | PC | 674 |
Nelson2 seats
| Angela Blackman | Independent | 1,236 ✓ |
| L. Lewis | Labour | 628 ✓ |
| M. James | Labour | 548 |
Newbridge3 seats
| Lyn Ackerman | Plaid Cymru - The Party of Wales | 1,427 ✓ |
| K Baker | Plaid Cymru - The Party of Wales | 1,379 ✓ |
| Anne Lloyd Morris | Plaid Cymru - The Party of Wales | 1,297 ✓ |
| D Clarke | Labour | 875 |
| Lucy Jenkins | Labour | 830 |
| M. Thomas | Labour | 767 |
Pengam2 seats · turnout 39.6%
| N. Turner | PC | 592 |
| Dot Jones | PC | 591 |
| A. Ashcroft | Labour | 491 |
| J. Purnell | Labour | 484 |
| A. Stevens | Conservative | 134 |
Penmaen2 seats
| A. Pritchard | Plaid Cymru - The Party of Wales | 1,156 ✓ |
| J. Evans | Plaid Cymru - The Party of Wales | 1,149 ✓ |
| C Sadler | Labour | 512 |
| Jean Summers | Labour | 479 |
| Granville Hale | Conservative | 158 |
Penyrheol4 seats
| L. Whittle | Plaid Cymru - The Party of Wales | 1,960 ✓ |
| A. Collins | Plaid Cymru - The Party of Wales | 1,616 ✓ |
| D. Potter | Plaid Cymru - The Party of Wales | 1,574 ✓ |
| Margaret Eiddwen Sargent | Plaid Cymru - The Party of Wales | 1,428 ✓ |
| P. Slarke | Labour | 1,190 |
| M. Thomas | Labour | 1,150 |
| P. Fitzgerald | Labour | 1,123 |
| B. Willan | Labour | 1,000 |
| W. Roberts | Liberal Democrats | 481 |
| H. Moore | Liberal Democrats | 468 |
Pontllanfraith3 seats
| M. Parker | Plaid Cymru - The Party of Wales | 1,908 ✓ |
| M. Pritchard | Plaid Cymru - The Party of Wales | 1,561 ✓ |
| G. Williams | Plaid Cymru - The Party of Wales | 1,493 ✓ |
| J. Morgan | Labour | 1,161 |
| R. Saralis | Labour | 1,154 |
| H. Moses | Labour | 914 |
| J. Shillito | Conservative | 266 |
Pontlottyn1 seat
| A. Morgan | Labour | 502 ✓ |
| D. Carter | Liberal Democrats | 91 |
Risca East3 seats · turnout 27.7%
| S. Jenkins | Labour | 1,145 |
| H. Styles | PC | 1,102 |
| Betty Toomer | Labour | 950 |
| D. Toomer | Labour | 893 |
Risca West2 seats · turnout 31.2%
| E. Griffiths | Labour | 978 |
| D. Wiltshire | Labour | 898 |
| B. Biddulph | PC | 741 |
St James3 seats
| C Forehead | Labour | 828 ✓ |
| K. Forehead | Labour | 776 ✓ |
| J. Newnham | Labour | 582 ✓ |
| S Brimble | Plaid Cymru - The Party of Wales | 488 |
| Russell Deacon | Liberal Democrats | 483 |
| J Eyres | Liberal Democrats | 453 |
| A Davies | Plaid Cymru - The Party of Wales | 446 |
| C Bennett | Liberal Democrats | 445 |
| V. Williams | Plaid Cymru - The Party of Wales | 408 |
| Terence Newhouse | Conservative | 247 |
| C Brabon-Morgan | Ind Lab | 87 |
St. Cattwg3 seats · turnout 36.0%
| K. Derrick | Independent | 1,194 |
| G. Court | Labour | 1,048 |
| E. Morgan | Labour | 991 |
| J. Wood | Labour | 937 |
| D. Smith | PC | 879 |
| M. Vivian | PC | 830 |
St. Martins3 seats
| K. Snell | Labour | 923 ✓ |
| James Fussell | Plaid Cymru - The Party of Wales | 793 ✓ |
| H Price | Liberal Democrats | 786 ✓ |
| A East | Labour | 734 |
| M. Ryland | Independent | 664 |
| M Mansfield | Labour | 655 |
| P Ellis | Liberal Democrats | 654 |
| G. Hibbert | Plaid Cymru - The Party of Wales | 645 |
| U Newman | Plaid Cymru - The Party of Wales | 613 |
| J Griffiths | Liberal Democrats | 578 |
| R Lea | Conservative | 398 |
| S Newhouse | Conservative | 308 |
Ynysddu2 seats
| D Cullen | Plaid Cymru - The Party of Wales | 1,025 ✓ |
| E Holland | Plaid Cymru - The Party of Wales | 831 ✓ |
| N Smith | Labour | 451 |
| P Williams | Labour | 429 |
Ystrad Mynach2 seats · turnout 13.0%
| R. Cook | Plaid Cymru - The Party of Wales | 863 |
| D. Smith | PC | 796 |
| B. Jones | Labour | 536 |
| Huw John David | Labour | 531 |
| L. Phillips | Liberal Democrats | 246 |
