| Name | Party | Ward | End of Term |
|---|
| Matthew Farrell | Liberal Democrats | Ashley | 07-05-2020 |
| Anthony Rowlands | Liberal Democrats | Ashley | 05-05-2022 |
| M Iqbal Zia | Liberal Democrats | Ashley | 04-05-2023 |
| Roma Mills | Labour Party | Batchwood | 05-05-2022 |
| Malachy Pakenham | Labour Party | Batchwood | 07-05-2020 |
| Liz Needham | Liberal Democrats | Batchwood | 04-05-2023 |
| Chris White | Liberal Democrats | Clarence | 07-05-2020 |
| Danny Clare | Liberal Democrats | Clarence | 04-05-2023 |
| Josie Madoc | Liberal Democrats | Clarence | 05-05-2022 |
| Jamie Day | Liberal Democrats | Colney Heath | 05-05-2022 |
| Chris Brazier | Liberal Democrats | Colney Heath | 04-05-2023 |
| Geoff Harrison | Liberal Democrats | Cunningham | 07-05-2020 |
| Rob Prowse | Liberal Democrats | Cunningham | 05-05-2022 |
| Robert Donald | Liberal Democrats | Cunningham | 04-05-2023 |
| Rosemary Farmer | Conservative and Unionist Party | Harpenden East | 07-05-2020 |
| Mary Maynard | Conservative and Unionist Party | Harpenden East | 05-05-2022 |
| Geoffrey Newman | Conservative and Unionist Party | Harpenden East | 04-05-2023 |
| Stephen Hodgson | Conservative and Unionist Party | Harpenden North | 07-05-2020 |
| Paul Cousin | Conservative and Unionist Party | Harpenden North | 05-05-2022 |
| Bert Pawle | Conservative and Unionist Party | Harpenden North | 04-05-2023 |
| David Heritage | Conservative and Unionist Party | Harpenden South | 07-05-2020 |
| Teresa Heritage | Conservative and Unionist Party | Harpenden South | 05-05-2022 |
| Brian Ellis | Conservative and Unionist Party | Harpenden South | 04-05-2023 |
| Julian Daly | Conservative and Unionist Party | Harpenden West | 05-05-2022 |
| Matt Stephens | Conservative and Unionist Party | Harpenden West | 07-05-2020 |
| Roger Butterworth | Conservative and Unionist Party | Harpenden West | 04-05-2023 |
| Katherine Gardner | Labour Party | London Colney | 05-05-2022 |
| Dreda Gordon | Labour Party | London Colney | 07-05-2020 |
| Helen Pakenham | Labour Party | London Colney | 04-05-2023 |
| Janet Churchard | Liberal Democrats | Marshalswick North | 07-05-2020 |
| Tom Clegg | Liberal Democrats | Marshalswick North | 05-05-2022 |
| Clare Julien | Liberal Democrats | Marshalswick North | 04-05-2023 |
| Richard Curthoys | Conservative and Unionist Party | Marshalswick South | 07-05-2020 |
| Helen Campbell | Liberal Democrats | Marshalswick South | 05-05-2022 |
| Karen Young | Liberal Democrats | Marshalswick South | 04-05-2023 |
| Stella Nash | Conservative and Unionist Party | Park Street | 05-05-2022 |
| David Yates | Independent | Park Street | 07-05-2020 |
| Syed Abidi | Liberal Democrats | Park Street | 04-05-2023 |
| Victoria Mead | Conservative and Unionist Party | Redbourn | 05-05-2022 |
| Tony Swendell | Independent | Redbourn | 07-05-2020 |
| David Mitchell | Independent | Redbourn | 04-05-2023 |
| Beric Read | Conservative and Unionist Party | Sandridge | 05-05-2022 |
| Frances Leonard | Conservative and Unionist Party | Sandridge | 04-05-2023 |
| Janet Smith | Labour Party | Sopwell | 07-05-2020 |
| Mandy McNeil | Liberal Democrats | Sopwell | 05-05-2022 |
| Emma Matanle | Liberal Democrats | Sopwell | 04-05-2023 |
| Simon Grover | Green Party | St Peters | 07-05-2020 |
| Jacqui Taylor | Liberal Democrats | St Peters | 05-05-2022 |
| Will Tucker | Liberal Democrats | St Peters | 04-05-2023 |
| Sue Featherstone | Conservative and Unionist Party | St Stephen | 05-05-2022 |
| Brian Gibbard | Conservative and Unionist Party | St Stephen | 07-05-2020 |
| David Winstone | Conservative and Unionist Party | St Stephen | 04-05-2023 |
| Chris Davies | Liberal Democrats | Verulam | 07-05-2020 |
| Edgar Hill | Liberal Democrats | Verulam | 05-05-2022 |
| Stephen Barrett | Liberal Democrats | Verulam | 04-05-2023 |
| Annie Brewster | Conservative and Unionist Party | Wheathampstead | 05-05-2022 |
| Gillian Clark | Conservative and Unionist Party | Wheathampstead | 07-05-2020 |
| Sandra Wood | Conservative and Unionist Party | Wheathampstead | 04-05-2023 |