| Lady Park Wood Forestry Commission | 45.32 ha | | — |
| Caldicot Castle and Country Park | 25.54 ha | | — |
| Magor Marsh SSSI | 22.75 ha | | — |
| Pentwyn Farm Grasslands | 19.76 ha | | — |
| Coed-y-Cerrig National Nature Reserve | 10.39 ha | | — |
| Bailey Park | 7.65 ha | | — |
| Chippenham Park | 7.07 ha | | — |
| Millennium Fields | 6.23 ha | | — |
| Dirt Farm | 6.02 ha | | — |
| Llanover Garden | 4.2 ha | | — |
| The Kymin National Trust | 3.62 ha | | — |
| Dewstow Hidden Garden and Grotto | 3.48 ha | | — |
| Blaen-Ochron House | 3.16 ha | | — |
| Linda Vista Gardens Abergavenny Council | 3.12 ha | | — |
| Rogiet Recreation Ground Rogiet Community Council | 2.79 ha | | — |
| Rockfield Park | 2.44 ha | | — |
| Great House | 2.41 ha | | — |
| Drybridge Park | 2.39 ha | | — |
| Bulwark Park | 1.88 ha | | — |
| Three Fields | 1.71 ha | | — |
| Swan Meadows | 1.62 ha | | — |
| Treworgan Common | 1.32 ha | | — |
| Abergavenny Castle | 1.21 ha | | — |
| Pant Farm | 1.12 ha | | — |
| Rockfield Park | 1.12 ha | | — |
| Goytre Wharf | 0.99 ha | | — |
| Bulwarks Prehistoric Enclosure | 0.72 ha | | — |
| Panta Grange | 0.56 ha | | — |
| Riverfront Park Chepstow Town Council | 0.52 ha | | — |
| Strongbow Park Monmouthshire County Council | 0.43 ha | | — |
| Formal Garden Council | 0.4 ha | | — |
| Babington Meadow Community | 0.31 ha | | — |
| Birbeck Park | 0.29 ha | | — |
| Catbrook Village Green | 0.14 ha | | — |
| St Mary's Park | 0.11 ha | | — |
| Grassy Knoll | 0.05 ha | | — |
| Monmouth Petanque Club terrain | 0.04 ha | | — |
| Garden City Comunity Garden | 0.02 ha | | — |
| St Govan Vincent Wildlife Trust | 0.02 ha | | — |
| Garden of Remembrance | — | | — |
| Piercefield Park | — | | — |