Before (end of 2016) (75 seats, Elections Centre)
Labour 60 · Plaid Cymru - The Party of Wales 9 · Other 4 · Conservative 1 · Liberal Democrats 1
After (end of 2017) (75 seats, Elections Centre)
Labour 47 · Plaid Cymru - The Party of Wales 18 · Other 5 · Conservative 4 · Liberal Democrats 1
Ward results
Aberaman North2 seats
| Linda De Vet | Labour | 671 ✓ |
| Sheryl Evans | Labour | 646 ✓ |
| Andrew Chainey | — | 512 |
| Laura Owen | PC | 357 |
Aberaman South2 seats
| Tina Williams | Labour | 759 ✓ |
| Anita Calvert | Labour | 727 ✓ |
| James Eirwyn Williams | PC | 315 |
| Steven David Hughes | — | 300 |
| Diane Summerhayes | PC | 246 |
| Lea Dempsey | UK Independence Party (UKIP) | 118 |
| Craig Resoli | UK Independence Party (UKIP) | 80 |
Abercynon2 seats
| Rhys Lewis | Labour | 850 ✓ |
| Elaine George | Labour | 775 ✓ |
| Phill Williams | — | 295 |
| Clayton Francis Jones | PC | 178 |
| Christine Ceaton | Conservative | 159 |
| Ian McLean | UK Independence Party (UKIP) | 143 |
| John Matthews | Green | 134 |
| Paul Simon Browne | UK Independence Party (UKIP) | 98 |
| Thomas Pinder | Conservative | 84 |
Aberdare East2 seats
| Steve Bradwick | Labour | 1,158 ✓ |
| Michael Forey | Labour | 917 ✓ |
| Ray Dally | — | 627 |
| Graham Marsh | — | 586 |
| David Walters | PC | 363 |
Aberdare West/Llwydcoed3 seats
| Ann Crimmings | Labour | 1,300 ✓ |
| Gareth Jones | Labour | 981 ✓ |
| Sharon Rees | Labour | 957 ✓ |
| Andrew Thomas | — | 819 |
| John Daniel | PC | 738 |
| Liz Walters | PC | 692 |
| Spencer Jones | PC | 634 |
| Stephen David Williams | Conservative | 628 |
| Sian Heart | Conservative | 483 |
Brynna1 seat
| Rita Turner | Labour | 686 ✓ |
| David Evans | PC | 654 |
Church Village1 seat
| Graham Stacey | Labour | 722 ✓ |
| Nick Tizard-Lee | Conservative | 468 |
| Ioan Bellin | PC | 312 |
Cilfynydd1 seat
| Stephen Belzak | Independent | 392 ✓ |
| Beverly Morgan | Labour | 293 |
| Stephen Powell | Independent | 65 |
| Jason Mark Johnson | PC | 57 |
Cwm Clydach1 seat
| Mark Norris | Labour | 358 ✓ |
| Heidi Whitter | PC | 243 |
| Karen Roberts | Liberal Democrats | 109 |
| Edwin John Allen | UK Independence Party (UKIP) | 45 |
Cwmbach1 seat
| Jeffrey Elliott | Labour | 564 ✓ |
| Gordon Brian Sullivan | — | 403 |
| Ann Jenkins | PC | 389 |
Cymmer2 seats
| Gareth Caple | Labour | 879 ✓ |
| Margaret Tegg | Labour | 725 ✓ |
| Nicole Griffiths | PC | 512 |
| Mark Stevenson | PC | 379 |
Ferndale2 seats
| Susan Morgans | Labour | 817 ✓ |
| Philip Howe | Independent | 583 ✓ |
| Andrea Jean Jones | PC | 513 |
| Annette Davies | Labour | 498 |
| Anna Jones | PC | 497 |
Gilfach-Goch1 seat
| Aurfron Roberts | Labour | 711 ✓ |
| Emyr Wilkinson | Conservative | 82 |
| Gerald Leslie Francis | Liberal Democrats | 69 |
Glyn-Coch1 seat
| David Williams | Labour | 340 ✓ |
| Amanda Jane Ellis | — | 169 |
Graig1 seat
| Jayne Brencher | Labour | 319 ✓ |
| Bob Fox | Independent | 244 |
| Ross Martin | PC | 66 |
| Amanda Jane Jones | Liberal Democrats | 31 |
Hawthorn1 seat
| Martin Fidler Jones | Labour | 654 ✓ |
| Cathy Lisles | Independent | 421 |
| Donald Rees | Conservative | 87 |
| Bob Humphreys | PC | 81 |
Hirwaun1 seat
| Karen Morgan | PC | 723 ✓ |
| Richard Daniel Jones | Labour | 347 |
| Andrew Abraham | UK Independence Party (UKIP) | 128 |
Llanharan1 seat
| Geraint Hopkins | Labour | 608 ✓ |
| Kathryn Elizabeth Germain | PC | 280 |
Llanharry1 seat
| Wayne Owen | Independent | 914 ✓ |
| Barry Stephens | Labour | 452 |
Llantrisant Town1 seat
| Glynne Holmes | Labour | 625 ✓ |
| Adam Robinson | Conservative | 526 |
| Gwen Eluned | PC | 262 |
Llantwit Fardre2 seats
| Joel James | Conservative | 1,311 ✓ |
| Mike Diamond | Conservative | 1,022 ✓ |
| Jacqui Bunnage | Labour | 421 |
| Bern Channon | Labour | 330 |
| Jools Jones | Independent | 249 |
| Steve Owen | PC | 223 |
| Gwion Rees | PC | 221 |
| Nicola Louise Knight | Liberal Democrats | 108 |
| Jonathan Bishop | Independent | 100 |
Llwyn-y-pia1 seat
| Wendy Lewis | Labour | 261 ✓ |
| Jeffrey Gregory | Independent | 221 |
| Geoff Glyndwr Rees | PC | 181 |
Maerdy1 seat
| Jack Harries | Labour | 576 ✓ |
| Hayley Harries | PC | 337 |
| Janet Kenrick | UK Independence Party (UKIP) | 35 |
Mountain Ash East1 seat
| Pauline Jarman | PC | 488 ✓ |
| Steve Carter | — | 263 |
| Jackie Fox | Labour | 240 |
Mountain Ash West2 seats
| Andrew Morgan | Labour | 781 ✓ |
| Wendy Treeby | Labour | 589 ✓ |
| Kelvyn Bevan | — | 299 |
| Nicola Benney | PC | 276 |
| Danny Allen | PC | 251 |
| Mia Hollsing | TUSC | 63 |
Pen-Y-Graig2 seats
| John Davies | PC | 555 ✓ |
| John Lewis Cullwick | PC | 549 ✓ |
| Kenneth Privett | Labour | 474 |
| Christina Sian Slade | Labour | 367 |
| Shawn Anthony Stevens | Independent | 214 |
| Philip Jones | Independent | 144 |
| Anita Lewis | Independent | 133 |
Pen-Y-Waun1 seat
| Helen Boggis | Labour | 269 ✓ |
| Penri James | PC | 212 |
| Ted Edwards | Independent | 178 |
Penrhiw-Ceiber2 seats
| Adam Daniel Fox | Labour | 792 ✓ |
| Gavin Williams | — | 751 ✓ |
| Jane Ward | Labour | 648 |
| Ieuan Benney | — | 371 |
Pentre2 seats
| Shelley Rebecca Rees-Owen | PC | 1,150 ✓ |
| Maureen Owen Weaver | PC | 963 ✓ |
| Ian Gordon Jenkins | Labour | 744 |
| Buffy Williams | Labour | 690 |
Pont-y-clun2 seats
| Keith Jones | Conservative | 1,413 ✓ |
| Margaret Griffiths | Labour | 1,236 ✓ |
| Paul Griffiths | Labour | 1,226 |
| Carole Ann Willis | PC | 733 |
Pontypridd Town1 seat
| Heledd Fychan | PC | 505 ✓ |
| Steve Carter | Labour | 324 |
| Cheryl Angela Lavington | Conservative | 145 |
| David Charles Payne | Liberal Democrats | 87 |
Porth2 seats
| James Eirwyn Williams | PC | 899 ✓ |
| Alun Cox | PC | 851 ✓ |
| Margaret Davies | Labour | 656 |
| Graham Smith | Labour | 574 |
| Kenneth Williams | Conservative | 216 |
Rhigos1 seat
| Graham Thomas | Labour | 442 ✓ |
| Ashley James Wakeling | PC | 125 |
Rhondda2 seats
| Tina Leyshon | Labour | 558 ✓ |
| Robert Smith | Labour | 554 ✓ |
| Geraint Huw Day | PC | 333 |
| Dan Thomas | PC | 266 |
| Steve Alan Duggan | Liberal Democrats | 221 |
| Brian James | Conservative | 193 |
| Gareth Fairclough | Conservative | 164 |
Rhydfelen Central/Ilan1 seat
| Maureen Webber | Labour | 627 ✓ |
| Rachhpal Randhawa | Conservative | 128 |
| Chad Rickard | PC | 124 |
Taffs Well1 seat
| Jill Bonetto | Labour | 593 ✓ |
| Christopher David Edwards | PC | 362 |
| Sep Bristo | Conservative | 240 |
Talbot Green1 seat
| Stephen Powell | Labour | 361 ✓ |
| Paul Baccara | Independent | 323 |
| Paul Thomas | Conservative | 128 |
| David Roberts | PC | 75 |
Ton-teg2 seats
| Lyndon Graham Walker | Independent | 1,030 ✓ |
| Lewis Aaron Hooper | Conservative | 611 ✓ |
| Clive Johnson | Independent | 527 |
| Ray Butler | Labour | 415 |
| Jean Hutchison | Labour | 394 |
| Tony Hallett | PC | 226 |
Tonypandy1 seat
| Gareth James Hughes | Labour | 420 ✓ |
| Wendy Allsop | PC | 301 |
| Philip Stephen Rowlands | Independent | 224 |
| David John Roberts | Independent | 150 |
Tonyrefail East2 seats
| Dan Owen-Jones | Labour | 818 ✓ |
| Danny Grehan | PC | 755 ✓ |
| Paul Wasley | Independent | 596 |
| Eudine Hanagan | Labour | 572 |
| Sheila Khalil | Conservative | 104 |
| Victor Lloyd-Nesling | Conservative | 82 |
Tonyrefail West1 seat
| Alex Davies-Jones | Labour | 759 ✓ |
| Gregory Morgan Powell | PC | 368 |
| Ann Kathleen Williamson | Conservative | 188 |
| Karen Webb | Independent | 148 |
| Stephen John Clee | Independent | 99 |
Trallwng1 seat
| Michael Robert Thomas Powell | Liberal Democrats | 719 ✓ |
| Andrew Bevan | Labour | 369 |
| Phillip Sullivan | Conservative | 93 |
Trealaw1 seat
| Joy Rosser | Labour | 657 ✓ |
| Barbara Evans | PC | 445 |
Treforest1 seat
| Steve Powderhill | Labour | 413 ✓ |
| Danny White | PC | 96 |
| Ann-Marie Mason | Conservative | 75 |
Treherbert2 seats
| William Jones | PC | 1,212 ✓ |
| Graham Davies | PC | 1,192 ✓ |
| Scott Emanuel | Labour | 890 |
| Andrew Morris | Labour | 683 |
Treorchy3 seats
| Alison Chapman | PC | 1,399 ✓ |
| Sheryl Evans | PC | 1,365 ✓ |
| Emyr John Webster | PC | 1,286 ✓ |
| Bridgette Harris | Independent | 1,012 |
| Margaret Evans | Labour | 726 |
| Gwilym Lewis | Labour | 653 |
| Darrell Keith Morris | Labour | 638 |
Tylorstown2 seats
| Robert Bevan | Labour | 836 ✓ |
| Mark Adams | Labour | 703 ✓ |
| Stephen Wilshire | Independent | 433 |
| Christine Betteney | PC | 244 |
| Lee Raymond Edgar Cole | PC | 175 |
Tyn-y-nant1 seat
| Constance Willis | Labour | 557 ✓ |
| Craig Ford | Conservative | 215 |
Ynyshir1 seat
| Darren Macey | PC | 692 ✓ |
| Robert Neil Evans | Labour | 414 |
Ynysybwl1 seat
| Sue Pickering | Labour | 719 ✓ |
| Daniel Anthony Baish | PC | 510 |
| Rhys Lewis | Conservative | 110 |
Ystrad2 seats
| Larraine Jones | PC | 945 ✓ |
| Elyn Stephens | PC | 667 ✓ |
| Malcolm John Watts | Labour | 660 |
| Dilys Jouvenat | Labour | 650 |
