| Teesmouth National Nature Reserve | 362.47 ha | | — |
| Saltholme Wildlife Reserve and Discovery Park RSPB | 216.22 ha | | — |
| Wynyard Woodland (Country) Park | 156.76 ha | | — |
| Six Fields Nature Reserve | 58.46 ha | | — |
| Admiralty Ecology Site | 51.4 ha | | — |
| Cowpen Bewley Woodland Country Park South Stockton Borough Council | 50.86 ha | | — |
| Preston Park | 42.0 ha | | — |
| Bowesfield Nature Reserve Tees Valley Wildlife Trust | 41.55 ha | | — |
| Portrack Marsh, Nature Reserve Tees Valley Wildlife Trust | 25.68 ha | | — |
| Broomwood Park | 21.11 ha | | — |
| Stillington Forest Park | 17.36 ha | | — |
| Honeypot Wood | 16.25 ha | | — |
| Billingham Beck Valley Country Park | 16.08 ha | | — |
| Ropner Park | 15.53 ha | | — |
| Newham Grange Park | 14.81 ha | | — |
| Carrs Angling Lakes | 14.12 ha | | — |
| Allison Trainer Park | 12.9 ha | | — |
| Charlton's Pond Stockton-on-Tees Borough Council | 8.97 ha | | — |
| Castle Eden Walkway Country Park | 7.63 ha | | — |
| Wynyard Woodland park and planetarium | 7.61 ha | | — |
| John Whitehead Park | 7.26 ha | | — |
| The Common | 6.9 ha | | — |
| Grangefield Park | 6.87 ha | | — |
| Black Bobby's Field | 5.87 ha | | — |
| Primrose Hill Park | 5.63 ha | | — |
| Romano Park Stockton Council | 5.58 ha | | — |
| Round Hill Country Park Stockton-on-Tees Borough Council | 5.39 ha | | — |
| Low Grange Beck Park | 5.35 ha | | — |
| Little Boy Park | 4.84 ha | | — |
| Rievaulx Avenue Field | 4.84 ha | | — |
| Brecon Dene | 3.56 ha | | — |
| Trinity Green | 3.54 ha | | — |
| High Grange Park | 3.42 ha | | — |
| Norton Hall Private Gardens | 3.08 ha | | — |
| Victoria Park | 1.59 ha | | — |
| Harewood Pleasure Gardens | 1.44 ha | | — |
| Billingham Peace Garden | 1.37 ha | | — |
| St Margarets Park | 1.28 ha | | — |
| Community Garden | 1.0 ha | | — |
| Hazeldene Park Stockton Council | 0.74 ha | | — |
| Billingham Green | 0.53 ha | | — |
| Tittybottle Park | 0.14 ha | | — |
| Public Open Space Private | 0.11 ha | | — |
| Bowood Park Stockton Council | 0.07 ha | | — |
| Cotswold Park Thirteen Group | 0.04 ha | | — |
| Coatham Wood Forestry England | — | | — |
| Sensory Garden | — | | — |