| Y Berwyn National Nature Reserve | 4552.31 ha | | — |
| Bodelwyddan Park | 111.46 ha | | — |
| Hafod Elwy National Nature Reserve National Resources Wales | 82.62 ha | | — |
| Llannerch Park | 42.65 ha | | — |
| Marine Lake | 17.94 ha | | — |
| Glan Morfa Community Woodland | 10.67 ha | | — |
| Coronation Gardens | 6.46 ha | | — |
| The Meadows | 6.11 ha | | — |
| Brickfield Pond Nature Reserve | 5.97 ha | | — |
| Rhuddlan Nature Reserve | 5.92 ha | | — |
| Llangollen Pavilion | 3.03 ha | | — |
| St Asaph Common | 2.24 ha | | — |
| Henllan Community Nature Space Denbighshire County Council | 1.89 ha | | — |
| Ffordd Elan Park | 1.88 ha | | — |
| Denbighshire Memorial Park and Crematorium | 1.67 ha | | — |
| Station Road Gardens | 1.15 ha | | — |
| Maes Hiraddug Nature Reserve | 1.04 ha | | — |
| Riverside Park | 1.04 ha | | — |
| Drift Park | 0.98 ha | | — |
| Parc Alafowlia | 0.76 ha | | — |
| Parc Alafowlia | 0.76 ha | 🐕 | — |
| Plas Newydd gardens | 0.67 ha | | — |
| West Rhyl Green Park | 0.48 ha | | — |
| The Green | 0.3 ha | | — |
| Hillside Gardens | 0.25 ha | | — |
| Hillside Gardens | 0.24 ha | | — |
| Italian Gardens | 0.23 ha | | — |
| Ffordd Porthdy Play Area | 0.16 ha | | — |
| Parc Pendre | 0.16 ha | | — |
| Dr Evan Pierce Memorial Garden | 0.11 ha | | — |
| Waterfall Gardens | 0.08 ha | | — |
| Brickfield Pond Butterfly Garden | 0.07 ha | | — |
| Garden of Remembrance | 0.07 ha | | — |
| Henllan Butterfly Garden | 0.04 ha | | — |
| Parterre | 0.04 ha | | — |
| Ysgol Dinas Brân Garden | 0.04 ha | | — |
| Beer garden Trefnant Inn | 0.03 ha | | — |
| Henllan Bee Garden | 0.03 ha | | — |
| Ffrith Beach Arena Park | — | | — |
| Gronant Dunes Nature Reserve | — | | — |
| Memorial Court | — | | — |