| Waddesdon Estate | 448.59 ha | | — |
| Black Park Buckinghamshire Council | 212.79 ha | | — |
| Burnham Beeches City Of London Corporation | 204.95 ha | | — |
| Stowe Landscape Gardens | 108.96 ha | | — |
| Claydon Park | 85.58 ha | | — |
| Stoke Common City Of London Corporation | 80.08 ha | | — |
| Finmere Wood | 79.49 ha | | — |
| Upper Ray Meadows | 79.37 ha | | — |
| College Lake Nature Reserve Berks, Bucks & Oxon Wildlife Trust | 65.15 ha | | — |
| Naphill Common | 61.01 ha | | — |
| Rushbeds Wood | 58.3 ha | | — |
| Newland Park | 49.14 ha | | — |
| Dancersend Berkshire, Buckinghamshire and Oxfordshire Wildlife Trust (BBOWT) | 47.36 ha | | — |
| Ascott House National Trust | 39.71 ha | | — |
| Denham Country Park Buckinghamshire County Council | 37.11 ha | | — |
| Booker Common | 36.71 ha | | — |
| Calvert Jubilee Nature Reserve | 36.61 ha | | — |
| Spade Oak Local Nature Reserve | 35.48 ha | | — |
| Upper Ray Meadows | 31.91 ha | | — |
| Hartwell House Park | 30.59 ha | | — |
| Pulpit Hill Nature Reserve National Trust | 29.71 ha | | — |
| Mentmore Park | 28.77 ha | | — |
| The Rye | 25.34 ha | | — |
| Aldebourne | 25.12 ha | | — |
| Hughenden Park Wycombe District Council | 24.89 ha | | — |
| Bacombe Hill Local Nature Reserve | 24.65 ha | | — |
| Riverside Walk Park Buckinghamshire Councill | 22.99 ha | | — |
| Thorney Country Park | 22.78 ha | | — |
| Upper Ray Meadows | 21.91 ha | | — |
| Hughenden Park National Trust | 21.83 ha | | — |
| Weston Turville Reservoir | 19.12 ha | | — |
| Gomm's Wood Local Nature Reserve | 18.51 ha | | — |
| Grangelands and The Rifle Range Berks, Bucks & Oxon Wildlife Trust | 16.41 ha | | — |
| Chiltern Open Air Museum | 15.82 ha | | — |
| Kings Mead | 15.54 ha | | — |
| Munces Wood & Kimbers Copse Woodland Trust | 14.79 ha | 🐕 | — |
| Lowndes Park Chesham Town Council | 14.65 ha | | — |
| Church Wood Royal Society for the Protection of Birds | 14.08 ha | | — |
| Yoesden Nature Reserve Berks, Bucks & Oxon Wildlife Trust | 13.6 ha | | — |
| Brush Hill Local Nature Reserve The Chiltern Society | 13.53 ha | | — |
| Meadowcroft Open Space Park Buckinghamshire Councill | 12.72 ha | | — |
| Sands Bank Nature Reserve | 12.26 ha | | — |
| Wooburn Park | 12.19 ha | | — |
| Bedgrove Park | 12.07 ha | | — |
| Tom Burt's Hill | 11.88 ha | | — |
| Pilch Field BBOWT | 11.71 ha | | — |
| Whiteleaf Hill The Chiltern Society | 10.98 ha | | — |
| Northmoor Hill Wood Local Nature Reserve | 10.37 ha | | — |
| Littleworth Common | 9.76 ha | | — |
| Frogmore Meadow Herts & Middlesex Wildlife Trust | 9.73 ha | | — |
| Heartlands | 9.63 ha | | — |
| Berry Hill | 9.43 ha | | — |
| Gomms Wood | 8.97 ha | | — |
| Stoke Poges Memorial Gardens | 8.12 ha | | — |
| Bourton Park | 8.07 ha | | — |
| Bernwood Meadows | 7.74 ha | | — |
| Millfield Wood | 7.7 ha | | — |
| Haydon Hill Park Buckinghamshire Councill | 7.44 ha | | — |
| Widmer Fields - The Orchard | 7.38 ha | | — |
| Aston Clinton Park | 7.29 ha | | — |
| Plomer Hill | 7.29 ha | | — |
| Higginson Park | 7.09 ha | | — |
| Westwood Park | 7.09 ha | | — |
| Round Wood | 6.93 ha | | — |
| Hardings Row Millenium Nature Reserve Brett Environment Trust;Iver Parish Council;South Bucks District Council | 6.89 ha | | — |
| Burnham Park | 6.55 ha | | — |
| Gold Hill Common | 6.53 ha | | — |
| Holtspur Bank Nature Reserve | 6.44 ha | | — |
| Hervines Park | 5.98 ha | | — |
| Totteridge Recreation Ground | 5.71 ha | | — |
| Derehams Park | 5.45 ha | | — |
| Alfred Rose Park | 5.37 ha | | — |
| Homefield Wood | 5.23 ha | | — |
| Weston Turville Rec | 5.12 ha | | — |
| Gray's Field | 5.04 ha | | — |
| Bradenham Hill | 4.85 ha | | — |
| Walnut Tree Meadow | 4.64 ha | | — |
| Location Gardens | 4.4 ha | | — |
| St Rumbolds Park | 4.31 ha | | — |
| Holtspur Bottom Butterfly Reserve Beaconsfield Town Council | 4.21 ha | | — |
| Gomm Valley | 3.99 ha | | — |
| Wades Park | 3.94 ha | | — |
| Chairborough Local Nature Reserve | 3.92 ha | | — |
| Bowlers Field Buckinghamshire Councill | 3.76 ha | | — |
| The Green | 3.76 ha | | — |
| Longburrow Park | 3.71 ha | | — |
| Buttler's Hangings | 3.69 ha | | — |
| Wingrave Park | 3.66 ha | | — |
| Widmer Fields - Ash Field | 3.59 ha | | — |
| Vale Park | 3.39 ha | | — |
| Cheena Meadow | 3.31 ha | | — |
| Widmer Fields - Oak Field | 3.14 ha | | — |
| Haddenham Country Park | 3.12 ha | | — |
| Verney Park | 2.95 ha | | — |
| Parterre | 2.9 ha | | — |
| Barn Meadow | 2.74 ha | | — |
| The Warren Nature reserve Wooburn and Bourne End Parish Council | 2.52 ha | 🐕 | — |
| War Memorial Recreation Ground | 2.47 ha | | — |
| The Witchell Ground Wendover Cricket Club | 2.45 ha | | — |
| Long Crendon Recreational Ground | 2.33 ha | | — |
| Stratford Fields | 2.33 ha | | — |
| Longwick Playing Field | 2.17 ha | | — |
| Seymour Park | 2.17 ha | | — |
| Riley Park | 2.09 ha | | — |
| King George V Recreational Ground | 2.07 ha | | — |
| Oakfield Park | 2.07 ha | | — |
| Aston Clinton Ragpits | 2.05 ha | | — |
| Pitstone Recreation Ground | 2.01 ha | | — |
| Little Chalfont Nature Park | 1.85 ha | | — |
| Prestwood Nature Reserve | 1.83 ha | 🐕 | — |
| Earl Mitchell | 1.82 ha | | — |
| Long Grove Wood | 1.66 ha | | — |
| Co-op Field | 1.61 ha | | — |
| St. Dunstan’s Recreation Ground | 1.6 ha | 🐕 | — |
| Chandos Park | 1.59 ha | | — |
| Cherry Orchard Nature Park | 1.59 ha | | — |
| Castle Park | 1.58 ha | | — |
| Walton Court Park | 1.56 ha | | — |
| Hampden Meadow Wendover Parish Council | 1.5 ha | 🐕 | — |
| Holmer Green Common | 1.49 ha | | — |
| The recreation ground | 1.44 ha | | — |
| Colonel Grantham Avenue Park | 1.38 ha | | — |
| Way and Tillard Recreation Ground | 1.35 ha | | — |
| Jubilee Green | 1.27 ha | | — |
| Ivinghoe Green | 1.18 ha | | — |
| Rookery Gardens | 1.12 ha | | — |
| The Willows green space. | 1.12 ha | | — |
| Temple Dell | 1.1 ha | | — |
| Totteridge Common | 1.09 ha | | — |
| Thornborough Bridge | 1.04 ha | | — |
| The Water Garden | 1.02 ha | | — |
| Long Crendon Play Area | 0.86 ha | | — |
| Haddington Way Park | 0.66 ha | | — |
| Waivers Way | 0.66 ha | | — |
| Lyde Gardens | 0.57 ha | | — |
| Snakemoor | 0.56 ha | | — |
| Bridge Street Park | 0.54 ha | | — |
| The Paddocks Park | 0.5 ha | | — |
| Green Park Seer Green Parish Council | 0.42 ha | | — |
| St. Peter's Garden Chalfont St Peter Parish Council | 0.36 ha | | — |
| Swallow lane park. Coldharbour Parish Council | 0.35 ha | | — |
| Parterre | 0.33 ha | | — |
| Pann Mill Gardens | 0.26 ha | | — |
| Pondwicks Community Orchard and Nature Area Amersham Town Council | 0.21 ha | | — |
| Walled Garden | 0.21 ha | | — |
| Hampden Hall Play Area | 0.2 ha | | — |
| Missenden Walled Garden | 0.17 ha | | — |
| West Bank Garden | 0.11 ha | | — |
| Priestfield Arboretum | — | | — |