Before (end of 2017) (48 seats, Elections Centre)
Conservative 28 · Labour 15 · Liberal Democrats 5 · Other 0
After (end of 2018) (48 seats, Open Council Data)
Conservative 25 · Labour 15 · Liberal Democrats 8
Ward results
| Rebecca Lass | Conservative | 1,519 ✓ |
| Graham Martyn Beevers | Labour | 274 |
| Louise Beth Noel | Liberal Democrats | 228 |
Haldens1 seat · turnout 37.6%
| Lucy Musk | Labour | 647 ✓ |
| Drew Robert Richardson | Conservative | 624 |
| Anthony Dennis | Liberal Democrats | 592 |
Handside1 seat · turnout 48.6%
| Siobhan Anne Elam | Liberal Democrats | 1,495 ✓ |
| Graham Eric Dowler | Conservative | 889 |
| Ian Merison | Labour | 279 |
Hatfield Central1 seat · turnout 26.3%
| Pankit Shah | Labour | 756 ✓ |
| Caron Juggins | Conservative | 446 |
| Adam Edwards | Liberal Democrats | 205 |
Hatfield East1 seat · turnout 32.4%
| Peter Hebden | Conservative | 756 ✓ |
| Cathy Watson | Labour | 648 |
| Jackie Brennan | Liberal Democrats | 363 |
Hatfield South West1 seat · turnout 29.1%
| Kieran Thorpe | Labour | 679 ✓ |
| Kim Elizabeth Langley | Conservative | 382 |
| Michael Jones | — | 208 |
| Wilson P.J. | Liberal Democrats | 197 |
Hatfield Villages2 seats · turnout 30.1%
| Duncan Bell | Conservative | 688 ✓ |
| Samuel Kasumu | Conservative | 598 ✓ |
| Margaret Anne Eames-Petersen | Labour | 554 |
| Oliver Timothy Price | Labour | 496 |
| Jane Quinton | Liberal Democrats | 212 |
| Gemma May Louise Moore | Liberal Democrats | 205 |
| Carol Ann Beckerman | Independent | 69 |
Hollybush1 seat · turnout 27.4%
| Lynn Chesterman | Labour | 726 ✓ |
| Howard Frank Weintrob | Conservative | 475 |
| Chris Corbey-West | Liberal Democrats | 103 |
| George Saunders | Independent | 56 |
Howlands1 seat · turnout 32.3%
| Max Peter Holloway | Labour | 858 ✓ |
| Stan Tunstall | Conservative | 629 |
| Konrad Basch | Liberal Democrats | 157 |
Northaw and Cuffley2 seats · turnout 35.0%
| Bernard Sarson | Conservative | 1,152 ✓ |
| Simon Anthony Wrenn | Conservative | 1,133 ✓ |
| Robina Helen Durrant | Liberal Democrats | 320 |
| Clive Johnson | Liberal Democrats | 240 |
| Sheila Ann Barrett | Labour | 205 |
Panshanger1 seat · turnout 35.6%
| Ayesha Rohale | Liberal Democrats | 601 ✓ |
| Darren Malcolm Bennett | Conservative | 564 |
| Zoe Pateman | Labour | 367 |
| Susan Patricia Storer | Independent | 70 |
Peartree1 seat
| Tamsin Francesca Jackson-Mynott | Liberal Democrats | 583 ✓ |
| Helen Jane Beckett | Labour | 512 |
| Roy Gilbert Talbot | Conservative | 229 |
Sherrards1 seat · turnout 44.8%
| Jean-Paul Bernard Skoczylas | Liberal Democrats | 782 ✓ |
| Alan Franey | Conservative | 672 |
| Jason Robinson | Labour | 484 |
| Jon Beckerman | Independent | 82 |
Welham Green and Hatfield South2 seats · turnout 33.4%
| Helen Quenet | Liberal Democrats | 793 ✓ |
| Jaida Esin Caliskan | Liberal Democrats | 692 ✓ |
| Teresa Florence Travell | Conservative | 599 |
| Ed Boulton | Conservative | 570 |
| Linda Elizabeth Mendez | Labour | 393 |
| John Richard Eames-Petersen | Labour | 364 |
Welwyn East1 seat · turnout 35.9%
| Steven Markiewicz | Conservative | 875 ✓ |
| Rose Grewal | Labour | 515 |
| Carl Jamie Storer | Independent | 237 |
| Helen Natalie Harrington | Liberal Democrats | 204 |
Welwyn West1 seat
| Sunny Thusu | Conservative | 1,054 ✓ |
| Sandra Anne Kyriakides | Independent | 785 |
| Joshua Murombo Chigwangwa | Labour | 191 |