| High Woods Country Park | 151.41 ha | | — |
| Wivenhoe Park | 108.35 ha | | — |
| Fingringhoe Wick Nature Reserve | 44.94 ha | | — |
| Hilly Fields Local Nature Reserve | 42.34 ha | | — |
| Cheshunt Field | 27.28 ha | | — |
| Salary Brook Nature Reserve | 22.88 ha | | — |
| Cymbeline Meadows Colchester City Council | 18.18 ha | | — |
| Mill Road Sports Ground | 17.19 ha | | — |
| Westlands Country Park | 16.46 ha | | — |
| Rat Island | 13.25 ha | | — |
| Bonner's Saltings | 11.44 ha | | — |
| Cudmore Grove Country Park | 9.92 ha | | — |
| Mile End Recreation Ground | 9.43 ha | | — |
| Garrison greensward | 8.76 ha | | — |
| Bourne Valley | 6.93 ha | | — |
| Castle Park | 6.83 ha | | — |
| Springs Lane Park | 6.52 ha | | — |
| Greenstead Park | 6.0 ha | | — |
| Ferry Marsh (Colne Local Nature Reserve) Colchester Borough Council | 5.89 ha | | — |
| Marks Tey Recreational Grounds | 4.91 ha | | — |
| Lexden Gathering Grounds Essex Wildlife Trust | 4.76 ha | | — |
| Lower Castle Park | 4.22 ha | | — |
| Broadfields | 3.97 ha | | — |
| Jamsin Park Stanway Parish Council | 3.94 ha | | — |
| Wheatfield road park | 3.44 ha | | — |
| Cowdray Marsh Colchester Borough Council | 2.78 ha | | — |
| Lexden Springs Local Nature Reserve | 2.68 ha | | — |
| Lexden Gathering Grounds | 2.25 ha | | — |
| Bergholt Rd Park | 1.81 ha | | — |
| Grove Road Playing Field | 1.65 ha | | — |
| Lexden Gathering Grounds | 1.49 ha | | — |
| Bull Meadow | 1.45 ha | | — |
| St. Andrews Park | 1.3 ha | | — |
| Wild Flower | 0.91 ha | | — |
| Aldham Park | 0.68 ha | | — |
| The Big Garden Together We Grow | 0.62 ha | | — |
| Horne Street Nature Reserve | 0.57 ha | | — |
| Jade Gardens | 0.5 ha | | — |
| Maltings Park West Bergholt Parish Council | 0.43 ha | | — |
| West Mersea Park | 0.4 ha | | — |
| Love Hill Lawn | 0.39 ha | | — |
| Pirie Green | 0.27 ha | | — |
| Sunken Garden | 0.15 ha | | — |
| Victorian Shrub Garden | 0.14 ha | | — |
| Meanwhile Garden | 0.11 ha | | — |
| Imola Gardens | 0.09 ha | | — |
| Rose garden | 0.08 ha | | — |
| Sensory Garden | 0.08 ha | | — |
| Sensory Garden | 0.07 ha | | — |
| Rose garden | 0.04 ha | | — |
| Wivenhoe Jubilee Garden | 0.04 ha | | — |
| Wivenhoe Wildlife Garden | 0.04 ha | | — |
| Pearson's Quay | 0.03 ha | | — |