| RSPB Medmerry Nature Reserve RSPB. Environment Agency. | 559.72 ha | | — |
| West Dean Gardens The Edward James Foundation | 173.71 ha | | — |
| Flexham Park | 121.36 ha | | — |
| Kingley Vale National Nature Reserve | 78.46 ha | | — |
| Graffham Down Trust | 66.12 ha | | — |
| Pleasure grounds National Trust | 14.63 ha | | — |
| Oaklands Park | 11.31 ha | | — |
| Platinum Jubilee Country Park Chichester District Council | 8.55 ha | | — |
| Havenstoke Park. | 6.22 ha | | — |
| Priory Park | 4.07 ha | | — |
| North Mundham Playing Field and Woodlands | 3.63 ha | | — |
| Maybush Copse Chichester Harbour Trust | 3.2 ha | | — |
| Marina Farm Chichester Harbour Conservancy. | 2.87 ha | | — |
| Chichester Crematorium | 2.78 ha | | — |
| Manor Green Park. Selsey Town Council | 2.27 ha | | — |
| Walled Garden | 2.27 ha | | — |
| Southbourne Recreation Ground | 2.11 ha | | — |
| Bishop's Palace Gardens | 1.75 ha | | — |
| Lavant Village Green Lavant Parish Council. | 1.49 ha | | — |
| The Green, Parklands | 1.45 ha | | — |
| The Wild Garden | 1.32 ha | | — |
| Gertrude Jekyll Gardens | 1.3 ha | | — |
| Lifeboat Green. Chichester District Council. | 0.98 ha | | — |
| The Brewery Field | 0.94 ha | | — |
| Itchenor Village Pond & Nature Reserve. | 0.85 ha | | — |
| Church Field National Trust. | 0.8 ha | | — |
| St James's or Jubilee Park | 0.75 ha | | — |
| Woolbeding Gardens. National Trust. The National Trust. | 0.61 ha | | — |
| The Walled Fruit Garden | 0.53 ha | | — |
| Litten Gardens Chichester City Council | 0.5 ha | | — |
| Donnington Park | 0.43 ha | | — |
| The Walled Garden | 0.41 ha | | — |
| The Walled Garden | 0.39 ha | | — |
| Cloisters Lawn | 0.36 ha | | — |
| Quay Meadow The National Trust | 0.36 ha | | — |
| roman garden | 0.23 ha | | — |
| Kitchen Garden | 0.19 ha | | — |
| Paradise | 0.11 ha | | — |
| The Sunken Garden | 0.09 ha | | — |
| roman plants garden | 0.08 ha | | — |
| Cutting Garden | 0.07 ha | | — |
| Diamond Jubilee Garden | 0.06 ha | | — |
| The Pergola | 0.05 ha | | — |
| Scented Garden | 0.03 ha | | — |
| The Chichester Shed | 0.03 ha | | — |
| Garden of Remembrance | — | | — |
| Linchmere Common | — | | — |
| Sky Park Farm | — | | — |