| Rendlesham Forest | 2566.5 ha | | — |
| Tunstall Forest | 1131.85 ha | | — |
| Minsmere Royal Society for the Protection of Birds | 977.52 ha | | — |
| Orford Ness National Nature Reserve (National Trust) | 510.14 ha | | — |
| Carlton Marshes Suffolk Wildlife Trust | 238.2 ha | | — |
| Wilderness Reserve Wilderness Reserve | 122.39 ha | | — |
| Martlesham Wilds Nature Reserve Suffolk Wildlife Trust | 116.13 ha | | — |
| Blyth Estate (Wilderness Reserve) | 109.7 ha | | — |
| Dingle Marshes Suffolk Wildlife;RSPB | 97.3 ha | | — |
| Chapel Barn Estate (Wilderness Reserve) Wilderness Reserve | 87.97 ha | | — |
| Glemham Hall | 73.39 ha | | — |
| Rushmere Common | 69.21 ha | | — |
| Sibton Estate Wilderness Reserve | 67.74 ha | | — |
| Captain's Wood Nature Reserve | 65.64 ha | | — |
| White House Farm Wildlife Site | 51.72 ha | | — |
| Foxburrow Farm Nature Reserve Suffolk Wildlife Trust | 50.09 ha | | — |
| Beccles Common | 42.62 ha | 🐕 | — |
| RSPB Snape Nature Reserve | 36.45 ha | | — |
| Orwell Country Park | 35.96 ha | | — |
| Rookery Park | 31.62 ha | | — |
| Halesworth Millennium Green | 29.43 ha | | — |
| Sibton Green Wilderness Reserve | 26.45 ha | | — |
| Landguard Nature Reserve | 25.51 ha | | — |
| Hen Reedbeds Suffolk Wildlife Trust | 21.65 ha | | — |
| Gunton Warren | 19.22 ha | | — |
| Hen Reedbeds Suffolk Wildlife Trust | 16.96 ha | | — |
| Grove Park | 15.28 ha | | — |
| North Cove Nature Reserve Suffolk Wildlife Trust | 14.63 ha | | — |
| Pakefield Park | 12.74 ha | | — |
| Cliff House Holiday Park | 10.45 ha | | — |
| Normanston Park | 8.89 ha | 🐕 | — |
| Clifflands Park | 7.66 ha | | — |
| Friston House Wood | 7.4 ha | | — |
| Corton woods | 6.95 ha | | — |
| Levington Lagoon Nature Reserve Suffolk Wildlife Trust | 5.97 ha | | — |
| Sandlings open space | 5.45 ha | | — |
| Nicholas Everitt Park | 5.05 ha | | — |
| Saint Mary's Green Trimley St. Mary Parish Council | 5.02 ha | | — |
| Langer Park | 4.77 ha | | — |
| The Coronation Recreation Ground | 4.76 ha | | — |
| Ness Park | 3.96 ha | | — |
| Waveney Crematorium and Memorial Park | 3.81 ha | | — |
| The Quay Field | 3.76 ha | | — |
| Blacksmiths Common - Open Access Land | 3.66 ha | | — |
| Grange Meadow | 3.56 ha | | — |
| Kirkley Fen Park | 3.39 ha | | — |
| Kingston Field | 3.38 ha | | — |
| Melton Recreation Ground | 3.36 ha | | — |
| Fen Meadow | 2.9 ha | | — |
| Sparrow's Nest Park | 2.89 ha | | — |
| Kessingland Community Playing Field | 2.86 ha | | — |
| Rosedale Park | 2.83 ha | | — |
| Town Park | 2.64 ha | | — |
| Gunton Meadow | 2.61 ha | | — |
| Little Common - Open Access Land | 2.56 ha | | — |
| Jubilee Park | 2.54 ha | | — |
| Middle Green - Open Access Land | 2.46 ha | | — |
| Martello Park | 2.33 ha | | — |
| Belle Vue Park | 2.23 ha | | — |
| Lound Heath - Open Access Land | 2.17 ha | | — |
| Stennett Memorial Field | 2.0 ha | | — |
| Castle Green | 1.98 ha | | — |
| Kensington Gardens | 1.94 ha | | — |
| Oak Meadow | 1.92 ha | | — |
| Village Green | 1.86 ha | | — |
| The Rec | 1.8 ha | | — |
| Broomheath | 1.66 ha | | — |
| Huntingfield (Millennium Green) | 1.57 ha | | — |
| The Meadow | 1.57 ha | | — |
| Darby Park | 1.54 ha | | — |
| Elmhurst Park | 1.53 ha | | — |
| Outer Bailey | 1.43 ha | | — |
| Blundeston (Millennium Green) | 1.37 ha | 🐕 | — |
| Oulton Community Centre Park | 1.32 ha | | — |
| Peardyke Common | 1.3 ha | | — |
| Kyson Hill National Trust | 1.27 ha | | — |
| Mill Common | 1.23 ha | | — |
| Allenby Park | 1.19 ha | 🐕 | — |
| Yoxwood | 0.53 ha | | — |
| Elmhurst Kitchen Garden | 0.05 ha | | — |
| Dial House Garden Aldeburgh Town Council | 0.01 ha | | — |
| Castle Marshes Suffolk Wildlife Trust | — | | — |