| RSPB Ynys-hir Royal Society for the Protection of Birds | 149.43 ha | | — |
| Coed Rheidol National Nature Reserve | 119.79 ha | | — |
| Rhos Llawr Cwrt National Nature Reserve | 58.46 ha | | — |
| Coedmor National Nature Reserve | 46.13 ha | | — |
| Coed Y Foel Nature Reserve Woodland Trust | 30.85 ha | | — |
| Cardigan Island / Ynys Aberteifi The Wildlife Trust of South and West Wales | 15.4 ha | | — |
| Llyn Eiddwen National Nature Reserve | 11.53 ha | | — |
| Llandysul Park | 6.44 ha | | — |
| Caeau Llety Cybi The Wildlife Trust of South & West Wales | 3.05 ha | | — |
| Rhos Glandenys The Wildlife Trust of South and West Wales | 2.34 ha | 🐕 | — |
| Penderi Cliffs | 2.32 ha | | — |
| Plascrug Avenue | 2.27 ha | | — |
| Castle Grounds | 2.03 ha | | — |
| Cae Hir Gardens | 1.79 ha | | — |
| Parc y Fro | 1.31 ha | | — |
| Coed y Mwldan Nature Reserve Woodland Trust | 0.96 ha | | — |
| Netpool Park Ceredigion County Council | 0.88 ha | | — |
| Maes Comins-coch | 0.79 ha | | — |
| Adpar Play Area | 0.68 ha | | — |
| Aberporth Community Green | 0.63 ha | 🐕 | — |
| Cae Cymunedol Pontgarreg Community Field | 0.48 ha | | — |
| Parc y llyn | 0.41 ha | | — |
| Mrs. Johnes' Garden | 0.39 ha | | — |
| Parc Kronberg | 0.34 ha | | — |
| Parc yr Orsedd | 0.34 ha | | — |
| Lôn Drewen Park | 0.28 ha | | — |
| Victoria Gardens | 0.28 ha | | — |
| Cilgwyn Garden | 0.2 ha | | — |
| Mariamne's Garden | 0.17 ha | | — |
| Parc y Dyffryn | 0.16 ha | | — |
| Coed Ty'n y Bedw ( Grogwynion Nature reserve) | 0.1 ha | | — |
| Kitchen Garden | 0.04 ha | | — |
| Cors Ian The Wildlife Trust of South and West Wales | — | | — |